Biblioteca para el desarrollo rápido y sencillo de programas para MetaTrader (Parte XXIX): Solicitudes comerciales pendientes - Clases de objetos de solicitudes

MetaTrader 5 — Ejemplos | 12 marzo 2020, 12:31

1 221

Artyom Trishkin

Contenido

Concepto

En los tres artículos anteriores, comprobamos el concepto de gestión de los métodos comerciales de la clase comercial con la ayuda de solicitudes pendientes.
Una solicitud pendiente, en esencia, es una orden comercial normal, pero ejecutada según una condición concreta. También comprobamos la condición sobre el retraso en el envío de una orden comercial en los métodos comerciales al obtener un error del servidor cuyo procesamiento requiere un cierto tiempo de espera antes del nuevo envío de la solicitud al servidor. Naturalemente, estas no son todas las condiciones en las que se pueden usar solicitudes pendientes. Asimismo, las condiciones pueden venir indicadas por niveles de precio, a cuya marca se enviará una orden comercial. También puede servir un conjunto de condiciones determinadas, por ejemplo, ciertos valores umbral de las propiedades del símbolo. Al alcanzar la igualdad con estos, se puede enviar una orden comercial al servidor (las órdenes stop limit son un claro ejemplo de solicitud comercial pendiente para la colocación de una orden límite cuando el precio alcanza el nivel de la orden stop).

En general, las solicitudes comerciales pendientes nos permiten crear una cierta lógica de comportamiento para el envío de órdenes comerciales al servidor.

Sin embargo, para ubicar todo lo mencionado en el código del objeto de solicitud pendiente, deberemos conferirle el aspecto del concepto general de los objetos de la biblioteca; así, estos objetos se podrán ampliar fácilmente para la posterior implementación en los mismos de nuevas propiedades. En la presente etapa de trabajo con las solicitudes pendientes, para comprobar el concepto, hemos escrito el código de trabajo directamente en el listado de la clase comercial, lo cual no resulta conceptualmente correcto para su uso posterior (precisamente así se había planeado: primero se comprueba todo rápidamente, y después se le otorga la forma adecuada).
En esta ocasión, vamos a crear la clase del objeto de solicitud pendiente abstracto y las clases de los objetos herederos del objeto de solicitud básico. En el objeto básico se contendrán las propiedades comunes para todos los objetos de solicitud, mientras que en las clases herederas se hallarán las propiedades individuales propias del estado de cada objeto hijo: así hacemos con todos los objetos de la biblioteca, y esta no será una excepción.

Antes de comenzar, como ya es típico, vamos a crear los mensajes de la biblioteca necesarios para trabajar con los objetos.

Añadimos al archivo Datas.mqh los índices de los nuevos mensajes de la biblioteca:

...

   MSG_LIB_TEXT_AND_PAUSE,                            //  and pause 
   MSG_LIB_TEXT_ALREADY_EXISTS,                       // already exists
   MSG_LIB_TEXT_CREATED,                              // Created
   MSG_LIB_TEXT_ATTEMPTS,                             // Attempts
   MSG_LIB_TEXT_WAIT,                                 // Wait
   MSG_LIB_TEXT_END,                                  // End

...

   MSG_LIB_TEXT_REQUEST,                              // Pending request #
   MSG_LIB_TEXT_REQUEST_DATAS,                        // Trading request parameters
   MSG_LIB_TEXT_PEND_REQUEST_DATAS,                   // Pending trading request parameters

...

   MSG_LIB_TEXT_PEND_REQUEST_BY_ERROR,                // Pending request generated based on the server return code
   MSG_LIB_TEXT_PEND_REQUEST_BY_REQUEST,              // Pending request created by request
   MSG_LIB_TEXT_PEND_REQUEST_WAITING_ONSET,           // Wait for the first trading attempt
   
   MSG_LIB_TEXT_PEND_REQUEST_STATUS,                 // Pending request status
   MSG_LIB_TEXT_PEND_REQUEST_STATUS_OPEN,             // Pending request to open a position
   MSG_LIB_TEXT_PEND_REQUEST_STATUS_CLOSE,            // Pending request to close a position
   MSG_LIB_TEXT_PEND_REQUEST_STATUS_SLTP,             // Pending request to modify position stop orders
   MSG_LIB_TEXT_PEND_REQUEST_STATUS_PLACE,            // Pending request to place a pending order
   MSG_LIB_TEXT_PEND_REQUEST_STATUS_REMOVE,           // Pending request to delete a pending order
   MSG_LIB_TEXT_PEND_REQUEST_STATUS_MODIFY,           // Pending request to modify pending order parameters
  };

y los textos de los mensajes correspondientes a los nuevos índices:

   {" и паузой "," and pause "},
   {" уже существует"," already exists"},
   {"Создан","Created"},
   {"Попыток","Attempts"},
   {"Ожидание","Wait"},
   {"Окончание","End"},

...

   {"Отложенный запрос #","Pending request #"},
   {"Параметры торгового запроса","Trade request parameters"},
   {"Параметры отложенного торгового запроса","Pending trade request parameters"},

...

   {"Отложенный запрос, созданный по коду возврата сервера","Pending request created as a result of server code"},
   {"Отложенный запрос, созданный по запросу","Pending request created by request"},
   {"Ожидание наступления времени первой торговой попытки","Waiting for onset time of the first trading attempt"},
   
   {"Статус отложенного запроса","Pending request status"},
   {"Отложенный запрос на открытие позиции","Pending request to open position"},
   {"Отложенный запрос на закрытие позиции","Pending request to close position"},
   {"Отложенный запрос на модификацию стоп-приказов позиции","Pending request to modify position stop orders"},
   {"Отложенный запрос на установку отложенного ордера","Pending request to place pending order"},
   {"Отложенный запрос на удаление отложенного ордера","Pending request to remove pending order"},
   {"Отложенный запрос на модификацию параметров отложенного ордера","Pending request to modify pending order parameters"},
  };

Como ya hemos dicho antes, el objeto básico de la solicitud comercial pendiente es una cierta solicitud abstracta que contiene las propiedades inherentes a todas las solicitudes comerciales, mientras que la indicación concreta de las propiedades se delega en los objetos herederos del objeto básico.
De esta forma, tendremos un objeto de solicitud básico y seis objetos herederos que precisarán las propiedades de la solicitud pendiente según el tipo de operación comercial realizado:

apertura de posición (nueva en la cuenta de cobertura, adición de volumen y viraje en la cuenta de compensación);
modificación de órdenes stop de la posición abierta;
cierre de posición, completo o parcial, y cierre por orden opuesta (en la cuenta de cobertura);
colocación de una orden pendiente;
modificación de las propiedades de una orden pendiente: los precios de las órdenes stop de una orden, el precio de colocación de una orden, el precio de una orden StopLimit, la vida útil de una orden, el tipo de rellenado y el tipo de expiración;
eliminación de una orden pendiente colcada con anterioridad.

El objeto básico de solicitud comercial pendiente abstracta

Como para todos los anteriores objetos de la biblioteca, vamos a crear enumeraciones con las propiedades del objeto de solicitud comercial pendiente.

Añadimos en el archivo Defines.mqh las enumeraciones de los estados, así como las propiedades de tipo entero, real y string del objeto:

//+------------------------------------------------------------------+
//| Data for working with pending trading requests                   |
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+
//| Pending request status                                           |
//+------------------------------------------------------------------+
enum ENUM_PEND_REQ_STATUS
  {
   PEND_REQ_STATUS_OPEN,                                    // Pending request to open a position
   PEND_REQ_STATUS_CLOSE,                                   // Pending request to close a position
   PEND_REQ_STATUS_SLTP,                                    // Pending request to modify open position stop orders
   PEND_REQ_STATUS_PLACE,                                   // Pending request to place a pending order
   PEND_REQ_STATUS_REMOVE,                                  // Pending request to delete a pending order
   PEND_REQ_STATUS_MODIFY                                   // Pending request to modify a placed pending order
  };
//+------------------------------------------------------------------+
//| Pending request type                                             |
//+------------------------------------------------------------------+
enum ENUM_PEND_REQ_TYPE
  {
   PEND_REQ_TYPE_ERROR=PENDING_REQUEST_ID_TYPE_ERR,         // Pending request created based on the return code or error
   PEND_REQ_TYPE_REQUEST=PENDING_REQUEST_ID_TYPE_REQ,       // Pending request created by request
  };
//+------------------------------------------------------------------+
//| Integer properties of a pending trading request                  |
//+------------------------------------------------------------------+
enum ENUM_PEND_REQ_PROP_INTEGER
  {
   PEND_REQ_PROP_STATUS = 0,                                // Trading request status (from the ENUM_PEND_REQ_STATUS enumeration)
   PEND_REQ_PROP_TYPE,                                      // Trading request type (from the ENUM_PEND_REQ_TYPE enumeration)
   PEND_REQ_PROP_ID,                                        // Trading request ID
   PEND_REQ_PROP_RETCODE,                                   // Result a request is based on
   PEND_REQ_PROP_TIME_CREATE,                               // Request creation time
   PEND_REQ_PROP_TIME_ACTIVATE,                             // Next attempt activation time
   PEND_REQ_PROP_WAITING,                                   // Waiting time between requests
   PEND_REQ_PROP_CURENT,                                    // Current attempt index
   PEND_REQ_PROP_TOTAL,                                     // Number of attempts
   //--- MqlTradeRequest
   PEND_REQ_PROP_MQL_REQ_ACTION,                            // Type of a performed action in the request structure
   PEND_REQ_PROP_MQL_REQ_TYPE,                              // Order type in the request structure
   PEND_REQ_PROP_MQL_REQ_MAGIC,                             // EA stamp (magic number ID) in the request structure
   PEND_REQ_PROP_MQL_REQ_ORDER,                             // Order ticket in the request structure
   PEND_REQ_PROP_MQL_REQ_POSITION,                          // Position ticket in the request structure
   PEND_REQ_PROP_MQL_REQ_POSITION_BY,                       // Opposite position ticket in the request structure
   PEND_REQ_PROP_MQL_REQ_DEVIATION,                         // Maximum acceptable deviation from a requested price in the request structure
   PEND_REQ_PROP_MQL_REQ_EXPIRATION,                        // Order expiration time (for ORDER_TIME_SPECIFIED type orders) in the request structure
   PEND_REQ_PROP_MQL_REQ_TYPE_FILLING,                      // Order filling type in the request structure
   PEND_REQ_PROP_MQL_REQ_TYPE_TIME,                         // Order lifetime type in the request structure
  }; 
#define PEND_REQ_PROP_INTEGER_TOTAL (19)                    // Total number of integer event properties
#define PEND_REQ_PROP_INTEGER_SKIP  (0)                     // Number of request properties not used in sorting
//+------------------------------------------------------------------+
//| Real properties of a pending trading request                     |
//+------------------------------------------------------------------+
enum ENUM_PEND_REQ_PROP_DOUBLE
  {
   PEND_REQ_PROP_PRICE_CREATE = PEND_REQ_PROP_INTEGER_TOTAL,// Price at the moment of a request generation
   //--- MqlTradeRequest
   PEND_REQ_PROP_MQL_REQ_VOLUME,                            // Requested volume of a deal in lots in the request structure
   PEND_REQ_PROP_MQL_REQ_PRICE,                             // Price in the request structure
   PEND_REQ_PROP_MQL_REQ_STOPLIMIT,                         // StopLimit level in the request structure
   PEND_REQ_PROP_MQL_REQ_SL,                                // Stop Loss level in the request structure
   PEND_REQ_PROP_MQL_REQ_TP,                                // Take Profit level in the request structure
  };
#define PEND_REQ_PROP_DOUBLE_TOTAL  (6)                     // Total number of event's real properties
#define PEND_REQ_PROP_DOUBLE_SKIP   (0)                     // Number of order properties not used in sorting
//+------------------------------------------------------------------+
//| String properties of a pending trading request                   |
//+------------------------------------------------------------------+
enum ENUM_PEND_REQ_PROP_STRING
  {
   //--- MqlTradeRequest
   PEND_REQ_PROP_MQL_REQ_SYMBOL = (PEND_REQ_PROP_INTEGER_TOTAL+PEND_REQ_PROP_DOUBLE_TOTAL),  // Trading instrument name in the request structure
   PEND_REQ_PROP_MQL_REQ_COMMENT                            // Order comment in the request structure
  };
#define PEND_REQ_PROP_STRING_TOTAL  (2)                     // Total number of event's string properties
//+------------------------------------------------------------------+

Para calcular las indexaciones de las propiedades en las matrices de propiedades del objeto, se usan macrosustituciones que indican el número de propiedades de cada tipo.
Ya analizamos este punto en el primer artículo de la descripción de la creación de la biblioteca, por lo que no vamos a retomar la descripción.

Como podemos ver por el listado, son propiedades del objeto tanto las propiedades que pertenecen a los parámetros de creación de una solicitud pendiente, como las propiedades indicadas en la estructura de la solicitud comercial MqlTradeRequest en la que se registran todos los parámetros de la solicitud enviada al servidor.
Dado que queremos clasificar y buscar los objetos de la lista según cualquiera de sus parámetros (como todos los anteriores objetos de la biblioteca), copiaremos el contenido completo de la estructura de la solicitud comercial en las propiedades correspodndientes del objeto que repiten la tarea de los campos de la estructura; en ese caso, podremos buscar y clasificar las solicitudes pendientes en la lista según cualquier propiedad.

Para buscar y clasificar los objetos de solicitudes pendientes, vamos a enumerar todos los posibles criterios de clasificación de estos objetos:

//+------------------------------------------------------------------+
//| Possible pending request sorting criteria                        |
//+------------------------------------------------------------------+
#define FIRST_PREQ_DBL_PROP         (PEND_REQ_PROP_INTEGER_TOTAL-PEND_REQ_PROP_INTEGER_SKIP)
#define FIRST_PREQ_STR_PROP         (PEND_REQ_PROP_INTEGER_TOTAL-PEND_REQ_PROP_INTEGER_SKIP+PEND_REQ_PROP_DOUBLE_TOTAL-PEND_REQ_PROP_DOUBLE_SKIP)
enum ENUM_SORT_PEND_REQ_MODE
  {
//--- Sort by integer properties
   SORT_BY_PEND_REQ_STATUS = 0,                             // Sort by a trading request status (from the ENUM_PEND_REQ_STATUS enumeration)
   SORT_BY_PEND_REQ_TYPE,                                   // Sort by a trading request type (from the ENUM_PEND_REQ_TYPE enumeration)
   SORT_BY_PEND_REQ_ID,                                     // Sort by a trading request ID
   SORT_BY_PEND_REQ_RETCODE,                                // Sort by a result a request is based on
   SORT_BY_PEND_REQ_TIME_CREATE,                            // Sort by a request generation time
   SORT_BY_PEND_REQ_TIME_ACTIVATE,                          // Sort by next attempt activation time
   SORT_BY_PEND_REQ_WAITING,                                // Sort by a waiting time between requests
   SORT_BY_PEND_REQ_CURENT,                                 // Sort by the current attempt index
   SORT_BY_PEND_REQ_TOTAL,                                  // Sort by a number of attempts
   //--- MqlTradeRequest
   SORT_BY_PEND_REQ_MQL_REQ_ACTION,                         // Sort by a type of a performed action in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_TYPE,                           // Sort by an order type in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_MAGIC,                          // Sort by an EA stamp (magic number ID) in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_ORDER,                          // Sort by an order ticket in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_POSITION,                       // Sort by a position ticket in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_POSITION_BY,                    // Sort by an opposite position ticket in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_DEVIATION,                      // Sort by a maximum acceptable deviation from a requested price in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_EXPIRATION,                     // Sort by an order expiration time (for ORDER_TIME_SPECIFIED type orders) in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_TYPE_FILLING,                   // Sort by an order filling type in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_TYPE_TIME,                      // Sort by order lifetime type in the request structure
//--- Sort by real properties
   SORT_BY_PEND_REQ_PRICE_CREATE = FIRST_PREQ_DBL_PROP,     // Sort by a price at the moment of a request generation
   //--- MqlTradeRequest
   SORT_BY_PEND_REQ_MQL_REQ_VOLUME,                         // Sort by a requested volume of a deal in lots in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_PRICE,                          // Sort by a price in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_STOPLIMIT,                      // Sort by StopLimit order level in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_SL,                             // Sort by StopLoss order level in the request structure
   SORT_BY_PEND_REQ_MQL_REQ_TP,                             // Sort by TakeProfit order level in the request structure
//--- Sort by string properties
   //--- MqlTradeRequest
   SORT_BY_PEND_REQ_MQL_SYMBOL = FIRST_PREQ_STR_PROP,       // Sort by a trading instrument name in the request structure
   SORT_BY_PEND_REQ_MQL_COMMENT                             // Sort by an order comment in the request structure
  };
//+------------------------------------------------------------------+

Ahora, creamos en un archivo aparte la nueva clase del objeto básico de solicitud pendiente abstracta.

Creamos en el catálogo de la biblioteca \MQL5\Include\DoEasy\Objects\ la nueva carpeta PendRequest\, en la que guardaremos los archivos de las clases de las solicitudes comerciales pendientes.

Vamos a crear en la carpeta PendRequest la nueva clase del objeto básico de solicitud pendiente abstracta PendRequest.mqh:

//+------------------------------------------------------------------+
//|                                                  PendRequest.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
#property strict    // Necessary for mql4
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include <Object.mqh>
#include "..\..\Services\DELib.mqh"
//+------------------------------------------------------------------+
//| Abstract pending trading request class                           |
//+------------------------------------------------------------------+
class CPendRequest : public CObject
  {
private:
   MqlTradeRequest   m_request;                                         // Trade request structure
//--- Copy trading request data
   void              CopyRequest(const MqlTradeRequest &request);
//--- Return the index of the array the request (1) double and (2) string properties are actually located at
   int               IndexProp(ENUM_PEND_REQ_PROP_DOUBLE property)const { return(int)property-PEND_REQ_PROP_INTEGER_TOTAL;                               }
   int               IndexProp(ENUM_PEND_REQ_PROP_STRING property)const { return(int)property-PEND_REQ_PROP_INTEGER_TOTAL-PEND_REQ_PROP_DOUBLE_TOTAL;    }
protected:
   int               m_digits;                                          // Number of decimal places in a quote
   int               m_digits_lot;                                      // Number of decimal places in the symbol lot value
   bool              m_is_hedge;                                        // Hedging account flag
   long              m_long_prop[PEND_REQ_PROP_INTEGER_TOTAL];          // Request integer properties
   double            m_double_prop[PEND_REQ_PROP_DOUBLE_TOTAL];         // Request real properties
   string            m_string_prop[PEND_REQ_PROP_STRING_TOTAL];         // Request string properties
//--- Constructor paramétrico protegido
                     CPendRequest(const ENUM_PEND_REQ_STATUS status,
                                  const uchar id,
                                  const double price,
                                  const ulong time,
                                  const MqlTradeRequest &request,
                                  const int retcode);
//--- Return (1) the magic number specified in the settings, (2) hedging account flag
   ushort            GetMagicID(void)                                      const { return ushort(this.GetProperty(PEND_REQ_PROP_MQL_REQ_MAGIC) & 0xFFFF);}
   bool              IsHedge(void)                                         const { return this.m_is_hedge;                                               }
public:
//--- Constructor por defecto
                     CPendRequest(){;}
//--- Set request (1) integer, (2) real and (3) string properties
   void              SetProperty(ENUM_PEND_REQ_PROP_INTEGER property,long value) { this.m_long_prop[property]=value;                                     }
   void              SetProperty(ENUM_PEND_REQ_PROP_DOUBLE property,double value){ this.m_double_prop[this.IndexProp(property)]=value;                   }
   void              SetProperty(ENUM_PEND_REQ_PROP_STRING property,string value){ this.m_string_prop[this.IndexProp(property)]=value;                   }
//--- Return (1) integer, (2) real and (3) string request properties from the properties array
   long              GetProperty(ENUM_PEND_REQ_PROP_INTEGER property)      const { return this.m_long_prop[property];                                    }
   double            GetProperty(ENUM_PEND_REQ_PROP_DOUBLE property)       const { return this.m_double_prop[this.IndexProp(property)];                  }
   string            GetProperty(ENUM_PEND_REQ_PROP_STRING property)       const { return this.m_string_prop[this.IndexProp(property)];                  }

//--- Return the flag of the request supporting the property
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)        { return true; }
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)         { return true; }
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_STRING property)         { return true; }

//--- Compare CPendRequest objects by a specified property (to sort the lists by a specified request object property)
   virtual int       Compare(const CObject *node,const int mode=0) const;
//--- Compare CPendRequest objects by all properties (to search for equal request objects)
   bool              IsEqual(CPendRequest* compared_obj);
   
//+------------------------------------------------------------------+
//| Methods of a simplified access to the request object properties  |
//+------------------------------------------------------------------+
//--- Return (1) request structure, (2) status, (3) type, (4) price at the moment of the request generation,
//--- (5) request generation time, (6) next attempt activation time,
//--- (7) waiting time between requests, (8) current attempt index,
//--- (9) number of attempts, (10) request ID
//--- (11) result a request is based on,
//--- (12) order ticket, (13) position ticket, (14) trading operation type
   MqlTradeRequest      MqlRequest(void)                                   const { return this.m_request;                                                }
   ENUM_PEND_REQ_STATUS Status(void)                                       const { return (ENUM_PEND_REQ_STATUS)this.GetProperty(PEND_REQ_PROP_STATUS);  }
   ENUM_PEND_REQ_TYPE   TypeRequest(void)                                  const { return (ENUM_PEND_REQ_TYPE)this.GetProperty(PEND_REQ_PROP_TYPE);      }
   double               PriceCreate(void)                                  const { return this.GetProperty(PEND_REQ_PROP_PRICE_CREATE);                  }
   ulong                TimeCreate(void)                                   const { return this.GetProperty(PEND_REQ_PROP_TIME_CREATE);                   }
   ulong                TimeActivate(void)                                 const { return this.GetProperty(PEND_REQ_PROP_TIME_ACTIVATE);                 }
   ulong                WaitingMSC(void)                                   const { return this.GetProperty(PEND_REQ_PROP_WAITING);                       }
   uchar                CurrentAttempt(void)                               const { return (uchar)this.GetProperty(PEND_REQ_PROP_CURENT);                 }
   uchar                TotalAttempts(void)                                const { return (uchar)this.GetProperty(PEND_REQ_PROP_TOTAL);                  }
   uchar                ID(void)                                           const { return (uchar)this.GetProperty(PEND_REQ_PROP_ID);                     }
   int                  Retcode(void)                                      const { return (int)this.GetProperty(PEND_REQ_PROP_RETCODE);                  }
   ulong                Order(void)                                        const { return this.GetProperty(PEND_REQ_PROP_MQL_REQ_ORDER);                 }
   ulong                Position(void)                                     const { return this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION);              }
   ENUM_TRADE_REQUEST_ACTIONS Action(void)                                 const { return (ENUM_TRADE_REQUEST_ACTIONS)this.GetProperty(PEND_REQ_PROP_MQL_REQ_ACTION);}

//--- Set (1) the price when creating a request, (2) request creation time,
//--- (3) current attempt time, (4) waiting time between requests,
//--- (5) current attempt index, (6) number of attempts, (7) ID,
//--- (8) order ticket, (9) position ticket
   void                 SetPriceCreate(const double price)                       { this.SetProperty(PEND_REQ_PROP_PRICE_CREATE,price);                   }
   void                 SetTimeCreate(const ulong time)                          { this.SetProperty(PEND_REQ_PROP_TIME_CREATE,time);                     }
   void                 SetTimeActivate(const ulong time)                        { this.SetProperty(PEND_REQ_PROP_TIME_ACTIVATE,time);                   }
   void                 SetWaitingMSC(const ulong miliseconds)                   { this.SetProperty(PEND_REQ_PROP_WAITING,miliseconds);                  }
   void                 SetCurrentAttempt(const uchar number)                    { this.SetProperty(PEND_REQ_PROP_CURENT,number);                        }
   void                 SetTotalAttempts(const uchar number)                     { this.SetProperty(PEND_REQ_PROP_TOTAL,number);                         }
   void                 SetID(const uchar id)                                    { this.SetProperty(PEND_REQ_PROP_ID,id);                                }
   void                 SetOrder(const ulong ticket)                             { this.SetProperty(PEND_REQ_PROP_MQL_REQ_ORDER,ticket);                 }
   void                 SetPosition(const ulong ticket)                          { this.SetProperty(PEND_REQ_PROP_MQL_REQ_POSITION,ticket);              }
   
//+------------------------------------------------------------------+
//| Descriptions of request object properties                        |
//+------------------------------------------------------------------+
//--- Get description of a request (1) integer, (2) real and (3) string property
   string               GetPropertyDescription(ENUM_PEND_REQ_PROP_INTEGER property);
   string               GetPropertyDescription(ENUM_PEND_REQ_PROP_DOUBLE property);
   string               GetPropertyDescription(ENUM_PEND_REQ_PROP_STRING property);

//--- Return the names of pending request object parameters
   string               StatusDescription(void)                const;
   string               TypeRequestDescription(void)           const;
   string               IDDescription(void)                    const;
   string               RetcodeDescription(void)               const;
   string               TimeCreateDescription(void)            const;
   string               TimeActivateDescription(void)          const;
   string               TimeWaitingDescription(void)           const;
   string               CurrentAttemptDescription(void)        const;

   string               TotalAttemptsDescription(void)         const;
   string               PriceCreateDescription(void)           const;
   
//--- Return the names of trading request structures parameters in the request object
   string               MqlReqActionDescription(void)          const;
   string               MqlReqMagicDescription(void)           const;
   string               MqlReqOrderDescription(void)           const;
   string               MqlReqSymbolDescription(void)          const;
   string               MqlReqVolumeDescription(void)          const;
   string               MqlReqPriceDescription(void)           const;
   string               MqlReqStopLimitDescription(void)       const;
   string               MqlReqStopLossDescription(void)        const;
   string               MqlReqTakeProfitDescription(void)      const;
   string               MqlReqDeviationDescription(void)       const;
   string               MqlReqTypeOrderDescription(void)       const;
   string               MqlReqTypeFillingDescription(void)     const;
   string               MqlReqTypeTimeDescription(void)        const;
   string               MqlReqExpirationDescription(void)      const;
   string               MqlReqCommentDescription(void)         const;
   string               MqlReqPositionDescription(void)        const;
   string               MqlReqPositionByDescription(void)      const;

//--- Display (1) description of request properties (full_prop=true - all properties, false - only supported ones),
//--- (2) short event message (implementation in the class descendants) in the journal
   void                 Print(const bool full_prop=false);
   virtual void         PrintShort(void){;}
  };
//+------------------------------------------------------------------+

Ya hemos creado muchas veces objetos idénticos con una descripción detallada de su funcionamiento. No merece la pena detenerse en el análisis de los principios de construcción del objeto: en este, como en otros semejantes, hay tres matrices para el guardado de las propiedades de tipo entero, real y string. También dispone de métodos de acceso a estas propiedades, tanto indicando las constantes de la propiedad GetProperty(), como usando la variante simplificada (el nombre propio del método). Asimismo, tiene métodos que muestran las descripciones de todas las propiedades del objeto. En resumen, presenta los componentes estándar para los objetos de la biblioteca. Podrá leer más información sobre la construcción de los objetos de la biblioteca en el primer artículo.

Implementamos el constructor cerrado de la clase fuera del cuerpo de la clase:

//+------------------------------------------------------------------+
//| Constructor                                                      |
//+------------------------------------------------------------------+
CPendRequest::CPendRequest(const ENUM_PEND_REQ_STATUS status,
                           const uchar id,
                           const double price,
                           const ulong time,
                           const MqlTradeRequest &request,
                           const int retcode)
  {
   this.CopyRequest(request);
   this.m_is_hedge=#ifdef __MQL4__ true #else bool(::AccountInfoInteger(ACCOUNT_MARGIN_MODE)==ACCOUNT_MARGIN_MODE_RETAIL_HEDGING) #endif;
   this.m_digits=(int)::SymbolInfoInteger(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL),SYMBOL_DIGITS);
   int dg=(int)DigitsLots(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL));
   this.m_digits_lot=(dg==0 ? 1 : dg);
   this.SetProperty(PEND_REQ_PROP_STATUS,status);
   this.SetProperty(PEND_REQ_PROP_ID,id);
   this.SetProperty(PEND_REQ_PROP_RETCODE,retcode);
   this.SetProperty(PEND_REQ_PROP_TYPE,this.GetProperty(PEND_REQ_PROP_RETCODE)>0 ? PEND_REQ_TYPE_ERROR : PEND_REQ_TYPE_REQUEST);
   this.SetProperty(PEND_REQ_PROP_TIME_CREATE,time);
   this.SetProperty(PEND_REQ_PROP_PRICE_CREATE,price);
  }
//+------------------------------------------------------------------+

Echemos un vistazo a lo que tenemos aquí:
En primer lugar, copiamos los datos de la estructura de la solicitud comercial a las matrices de las propiedades de tipo entero, real y string con la ayuda del método CopyRequest(), que analizamos anteriormente.
A continuación, establecemos la bandera con el tipo cobertura y establecemos el número de dígitos decimales tras la coma en la cotización del símbolo y en el valor del lote del símbolo (esto es necesario para mostrar correctamente la información en el diario). En este caso, además, si el número de dígitos tras la coma en el valor del lote es igual a cero, realizaremos la muestra con un dígito tras la coma, dado que el valor del lote se ve con mayor claridad: en lugar de "1", se mostrará "1.0".
Después, solo tendremos que establecer los valores transmitidos de algunas propiedades al constructor de la clase al crear el objeto de solicitud con los valores de las propiedades correspondientes del objeto.
De esta forma, rellenaremos todas las propiedades del objeto de solicitud pendiente justo al crearlo.

Método de comparación de dos objetos de solicitudes pendientes según la propiedad indicada (mode):

//+------------------------------------------------------------------+
//| Compare CPendRequest objects by a specified property             |
//+------------------------------------------------------------------+
int CPendRequest::Compare(const CObject *node,const int mode=0) const
  {
   const CPendRequest *compared_obj=node;
//--- compare integer properties of two events
   if(mode<PEND_REQ_PROP_INTEGER_TOTAL)
     {
      long value_compared=compared_obj.GetProperty((ENUM_PEND_REQ_PROP_INTEGER)mode);
      long value_current=this.GetProperty((ENUM_PEND_REQ_PROP_INTEGER)mode);
      return(value_current>value_compared ? 1 : value_current<value_compared ? -1 : 0);
     }
//--- compare integer properties of two objects
   if(mode<PEND_REQ_PROP_DOUBLE_TOTAL+PEND_REQ_PROP_INTEGER_TOTAL)
     {
      double value_compared=compared_obj.GetProperty((ENUM_PEND_REQ_PROP_DOUBLE)mode);
      double value_current=this.GetProperty((ENUM_PEND_REQ_PROP_DOUBLE)mode);
      return(value_current>value_compared ? 1 : value_current<value_compared ? -1 : 0);
     }
//--- compare string properties of two objects
   else if(mode<PEND_REQ_PROP_DOUBLE_TOTAL+PEND_REQ_PROP_INTEGER_TOTAL+PEND_REQ_PROP_STRING_TOTAL)
     {
      string value_compared=compared_obj.GetProperty((ENUM_PEND_REQ_PROP_STRING)mode);
      string value_current=this.GetProperty((ENUM_PEND_REQ_PROP_STRING)mode);
      return(value_current>value_compared ? 1 : value_current<value_compared ? -1 : 0);
     }
   return 0;
  }
//+------------------------------------------------------------------+

Método de comparación completa de dos objetos de solicitudes pendientes según todas sus propiedades:

//+------------------------------------------------------------------+
//| Compare CPendRequest objects by all properties                   |
//+------------------------------------------------------------------+
bool CPendRequest::IsEqual(CPendRequest *compared_obj)
  {
   int beg=0, end=PEND_REQ_PROP_INTEGER_TOTAL;
   for(int i=beg; i<end; i++)
     {
      ENUM_PEND_REQ_PROP_INTEGER prop=(ENUM_PEND_REQ_PROP_INTEGER)i;
      if(this.GetProperty(prop)!=compared_obj.GetProperty(prop)) return false; 
     }
   beg=end; end+=PEND_REQ_PROP_DOUBLE_TOTAL;
   for(int i=beg; i<end; i++)
     {
      ENUM_PEND_REQ_PROP_DOUBLE prop=(ENUM_PEND_REQ_PROP_DOUBLE)i;
      if(this.GetProperty(prop)!=compared_obj.GetProperty(prop)) return false; 
     }
   beg=end; end+=PEND_REQ_PROP_STRING_TOTAL;
   for(int i=beg; i<end; i++)
     {
      ENUM_PEND_REQ_PROP_STRING prop=(ENUM_PEND_REQ_PROP_STRING)i;
      if(this.GetProperty(prop)!=compared_obj.GetProperty(prop)) return false; 
     }
//--- All properties are equal
   return true;
  }
//+------------------------------------------------------------------+

Estos métodos han sido también analizados más de una vez al crear los anteriores objetos de la biblioteca.
Solo repetiremos que el método virtual Compare() del objeto de solicitud, que sirve para realizar la comparación según una propiedad indicada, compara las propiedades indicadas del objeto actual de la clase CPendRequest y de un objeto de la misma clase transmitido al método. Si el valor del objeto actual es superior al valor del objeto comparado, el método retornará 1, si es inferior, -1, de lo contrario, 0. Esto es necesario para trabajar con las listas de punteros a los objetos: con su métodoSearsh(), que usa para la comparación rápida el método virtual Compare() del objeto básico de la biblioteca estándar. Dado que el método es virtual, deberemos redefinirlo en los herederos de la clase CObject, que es precisamente lo que hemos hecho aquí.
El método IsEqual(), por su parte, compara una a una cada propiedad de los dos objetos comparados, y con la primera diferencia, retorna false: los objetos no son iguales. Al finalizar los tres ciclos por todas las propiedades de los dos objetos comparados, se retorna true: todas las propiedades de los objetos son iguales.

Método para copiar la estructura de la solicitud comercial en las matrices de propiedades del objeto de solicitud pendiente:

//+------------------------------------------------------------------+
//| Copy trading request data                                        |
//+------------------------------------------------------------------+
void CPendRequest::CopyRequest(const MqlTradeRequest &request)
  {
//--- Copy a passed structure to an object structure
   this.m_request=request;

//--- Integer properties of a trading request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_ACTION,request.action);             // Type of a performed action in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_TYPE,request.type);                 // Order type in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_MAGIC,request.magic);               // EA stamp (magic number ID) in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_ORDER,request.order);               // Order ticket in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_POSITION,request.position);         // Position ticket in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_POSITION_BY,request.position_by);   // Opposite position ticket in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_DEVIATION,request.deviation);       // Maximum acceptable deviation from a requested price in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_EXPIRATION,request.expiration);     // Order expiration time (for ORDER_TIME_SPECIFIED type orders) in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_TYPE_FILLING,request.type_filling); // Order filling type in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_TYPE_TIME,request.type_time);       // Order lifetime type in the request structure
//--- Real properties of a trading request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME,request.volume);             // Requested volume of a deal in lots in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_PRICE,request.price);               // Price in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT,request.stoplimit);       // StopLimit level in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_SL,request.sl);                     // Stop Loss level in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_TP,request.tp);                     // Take Profit level in the request structure
//--- String properties of a trading request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL,request.symbol);             // Trading instrument name in the request structure
   this.SetProperty(PEND_REQ_PROP_MQL_REQ_COMMENT,request.comment);           // Order comment in the request structure
  }
//+------------------------------------------------------------------+

Aquí, en primer lugar copiamos los valores de todos los campos de la estructura de la solicitud comercial transmitida al método a la misma estructura del objeto de solicitud. A continuación, asignamos los valores de todos los campos de la estructura a las propiedades del objeto con la ayuda de los métodos de establecimiento de propiedades SetProperty().

Métodos que retornan las descripciones de las propiedades de tipo entero, real y string del objeto de solicitud pendiente:

//+------------------------------------------------------------------+
//| Return the description of the request integer property           |
//+------------------------------------------------------------------+
string CPendRequest::GetPropertyDescription(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   return
     (
      property==PEND_REQ_PROP_STATUS               ?  this.StatusDescription()            :
      property==PEND_REQ_PROP_TYPE                 ?  this.TypeRequestDescription()       :
      property==PEND_REQ_PROP_ID                   ?  this.IDDescription()                :
      property==PEND_REQ_PROP_RETCODE              ?  this.RetcodeDescription()           :
      property==PEND_REQ_PROP_TIME_CREATE          ?  this.TimeCreateDescription()        :
      property==PEND_REQ_PROP_TIME_ACTIVATE        ?  this.TimeActivateDescription()      :
      property==PEND_REQ_PROP_WAITING              ?  this.TimeWaitingDescription()       :
      property==PEND_REQ_PROP_CURENT               ?  this.CurrentAttemptDescription()    :

      property==PEND_REQ_PROP_TOTAL                ?  this.TotalAttemptsDescription()     :
      //--- MqlTradeRequest
      property==PEND_REQ_PROP_MQL_REQ_ACTION       ?  this.MqlReqActionDescription()      :
      property==PEND_REQ_PROP_MQL_REQ_TYPE         ?  this.MqlReqTypeOrderDescription()   :
      property==PEND_REQ_PROP_MQL_REQ_MAGIC        ?  this.MqlReqMagicDescription()       :
      property==PEND_REQ_PROP_MQL_REQ_ORDER        ?  this.MqlReqOrderDescription()       :
      property==PEND_REQ_PROP_MQL_REQ_POSITION     ?  this.MqlReqPositionDescription()    :
      property==PEND_REQ_PROP_MQL_REQ_POSITION_BY  ?  this.MqlReqPositionByDescription()  :
      property==PEND_REQ_PROP_MQL_REQ_DEVIATION    ?  this.MqlReqDeviationDescription()   :
      property==PEND_REQ_PROP_MQL_REQ_EXPIRATION   ?  this.MqlReqExpirationDescription()  :
      property==PEND_REQ_PROP_MQL_REQ_TYPE_FILLING ?  this.MqlReqTypeFillingDescription() :
      property==PEND_REQ_PROP_MQL_REQ_TYPE_TIME    ?  this.MqlReqTypeTimeDescription()    :
      ::EnumToString(property)
     );
  }
//+------------------------------------------------------------------+
//| Return the description of the request real property              |
//+------------------------------------------------------------------+
string CPendRequest::GetPropertyDescription(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   return
     (
      property==PEND_REQ_PROP_PRICE_CREATE      ?  this.PriceCreateDescription()          :
      //--- MqlTradeRequest
      property==PEND_REQ_PROP_MQL_REQ_VOLUME    ?  this.MqlReqVolumeDescription()         :
      property==PEND_REQ_PROP_MQL_REQ_PRICE     ?  this.MqlReqPriceDescription()          :
      property==PEND_REQ_PROP_MQL_REQ_STOPLIMIT ?  this.MqlReqStopLimitDescription()      :
      property==PEND_REQ_PROP_MQL_REQ_SL        ?  this.MqlReqStopLossDescription()       :
      property==PEND_REQ_PROP_MQL_REQ_TP        ?  this.MqlReqTakeProfitDescription()     :
      ::EnumToString(property)
     );
  }
//+------------------------------------------------------------------+
//| Return the description of the request string property            |
//+------------------------------------------------------------------+
string CPendRequest::GetPropertyDescription(ENUM_PEND_REQ_PROP_STRING property)
  {
   return
     (
      property==PEND_REQ_PROP_MQL_REQ_SYMBOL    ?  this.MqlReqSymbolDescription()         :
      property==PEND_REQ_PROP_MQL_REQ_COMMENT   ?  this.MqlReqCommentDescription()        :
      ::EnumToString(property)
     );
  }
//+------------------------------------------------------------------+

Transmitimos la propiedad al método, y a continuación, depnediendo del valor de la propiedad, retornamos su descripción de tipo string
con la ayuda de los métodos que retornan la descripción de esta propiedad:

//+------------------------------------------------------------------+
//| Return the pending request status name                           |
//+------------------------------------------------------------------+
string CPendRequest::StatusDescription(void) const
  {
   int code_descr=
     (
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_OPEN   ?  MSG_LIB_TEXT_PEND_REQUEST_STATUS_OPEN     :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_CLOSE  ?  MSG_LIB_TEXT_PEND_REQUEST_STATUS_CLOSE    :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_SLTP   ?  MSG_LIB_TEXT_PEND_REQUEST_STATUS_SLTP     :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_PLACE  ?  MSG_LIB_TEXT_PEND_REQUEST_STATUS_PLACE    :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_REMOVE ?  MSG_LIB_TEXT_PEND_REQUEST_STATUS_REMOVE   :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_MODIFY ?  MSG_LIB_TEXT_PEND_REQUEST_STATUS_MODIFY   :
      MSG_EVN_STATUS_UNKNOWN
     );
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS)+": "+CMessage::Text(code_descr);
  }
//+------------------------------------------------------------------+
//| Return the pending request type name                             |
//+------------------------------------------------------------------+
string CPendRequest::TypeRequestDescription(void) const
  {
   int code_descr=
     (
      this.GetProperty(PEND_REQ_PROP_TYPE)==PEND_REQ_TYPE_ERROR   ?  MSG_LIB_TEXT_PEND_REQUEST_BY_ERROR     :
      this.GetProperty(PEND_REQ_PROP_TYPE)==PEND_REQ_TYPE_REQUEST ?  MSG_LIB_TEXT_PEND_REQUEST_BY_REQUEST   :
      MSG_SYM_MODE_UNKNOWN
     );
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TYPE)+": "+CMessage::Text(code_descr);
  }
//+------------------------------------------------------------------+
//| Return the pending request ID description                        |
//+------------------------------------------------------------------+
string CPendRequest::IDDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_ID)+": #"+(string)this.GetProperty(PEND_REQ_PROP_ID);
  }
//+------------------------------------------------------------------+
//| Return the description of an error code a request is based on    |
//+------------------------------------------------------------------+
string CPendRequest::RetcodeDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_RETCODE)+": "+
          CMessage::Text((int)this.GetProperty(PEND_REQ_PROP_RETCODE))+
          " ("+(string)this.GetProperty(PEND_REQ_PROP_RETCODE)+")";
  }
//+------------------------------------------------------------------+
//| Return the description of a pending request creation time        |
//+------------------------------------------------------------------+
string CPendRequest::TimeCreateDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TIME_CREATE)+": "+::TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
  }
//+------------------------------------------------------------------+
//| Return the description of a pending request activation time      |
//+------------------------------------------------------------------+
string CPendRequest::TimeActivateDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TIME_ACTIVATE)+": "+::TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_ACTIVATE));
  }
//+----------------------------------------------------------------------+
//| Return the description of a time spent waiting for a pending request |
//+----------------------------------------------------------------------+
string CPendRequest::TimeWaitingDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_WAITING)+": "+
          (string)this.GetProperty(PEND_REQ_PROP_WAITING)+
          " ("+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_MINUTES|TIME_SECONDS)+")";
  }
//+------------------------------------------------------------------+
//| Return the description of the current pending request attempt    |
//+------------------------------------------------------------------+
string CPendRequest::CurrentAttemptDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_CURRENT_ATTEMPT)+": "+(string)this.GetProperty(PEND_REQ_PROP_CURENT);
  }
//+------------------------------------------------------------------+
//| Return the description of a number of pending request attempts   |
//+------------------------------------------------------------------+
string CPendRequest::TotalAttemptsDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TOTAL_ATTEMPTS)+": "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
  }
//+------------------------------------------------------------------+
//| Return the description of a price when creating a request        |
//+------------------------------------------------------------------+
string CPendRequest::PriceCreateDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_PRICE_CREATE)+": "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_PRICE_CREATE),this.m_digits);
  }
//+------------------------------------------------------------------+
//| Return the executed action type description                      |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqActionDescription(void) const
  {
   int code_descr=
     (
      this.GetProperty(PEND_REQ_PROP_MQL_REQ_ACTION)==TRADE_ACTION_DEAL       ?  MSG_LIB_TEXT_REQUEST_ACTION_DEAL       :
      this.GetProperty(PEND_REQ_PROP_MQL_REQ_ACTION)==TRADE_ACTION_PENDING    ?  MSG_LIB_TEXT_REQUEST_ACTION_PENDING    :
      this.GetProperty(PEND_REQ_PROP_MQL_REQ_ACTION)==TRADE_ACTION_SLTP       ?  MSG_LIB_TEXT_REQUEST_ACTION_SLTP       :
      this.GetProperty(PEND_REQ_PROP_MQL_REQ_ACTION)==TRADE_ACTION_MODIFY     ?  MSG_LIB_TEXT_REQUEST_ACTION_MODIFY     :
      this.GetProperty(PEND_REQ_PROP_MQL_REQ_ACTION)==TRADE_ACTION_REMOVE     ?  MSG_LIB_TEXT_REQUEST_ACTION_REMOVE     :
      this.GetProperty(PEND_REQ_PROP_MQL_REQ_ACTION)==TRADE_ACTION_CLOSE_BY   ?  MSG_LIB_TEXT_REQUEST_ACTION_CLOSE_BY   :
      MSG_LIB_TEXT_REQUEST_ACTION_UNCNOWN
     );
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_ACTION)+": "+CMessage::Text(code_descr);
  }
//+------------------------------------------------------------------+
//| Return the magic number value description                        |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqMagicDescription(void) const
  {
   return CMessage::Text(MSG_ORD_MAGIC)+": "+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_MAGIC)+
          (this.GetMagicID()!=this.GetProperty(PEND_REQ_PROP_MQL_REQ_MAGIC) ? " ("+(string)this.GetMagicID()+")" : "");
  }
//+------------------------------------------------------------------+
//| Return the order ticket value description                        |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqOrderDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_ORDER)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_ORDER)>0 ? 
           "#"+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_ORDER) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request position ticket description                   |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqPositionDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_POSITION)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION)>0 ? 
           (string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request opposite position ticket description          |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqPositionByDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_POSITION_BY)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION_BY)>0 ? 
           (string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION_BY) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request deviation size description                    |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqDeviationDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_DEVIATION)+": "+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_DEVIATION);
  }
//+------------------------------------------------------------------+
//| Return the request order type description                        |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqTypeOrderDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_TYPE)+": "+OrderTypeDescription((ENUM_ORDER_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE));
  }
//+------------------------------------------------------------------+
//| Return the request order filling mode description                |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqTypeFillingDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_TYPE_FILLING)+": "+OrderTypeFillingDescription((ENUM_ORDER_TYPE_FILLING)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE_FILLING));
  }
//+------------------------------------------------------------------+
//| Return the request order lifetime type description               |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqTypeTimeDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_TYPE_TIME)+": "+OrderTypeTimeDescription((ENUM_ORDER_TYPE_TIME)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE_TIME));
  }
//+------------------------------------------------------------------+
//| Return the request order expiration time description             |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqExpirationDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_EXPIRATION)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_EXPIRATION)>0 ? 
           ::TimeToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_EXPIRATION)) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request volume description                            |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqVolumeDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_VOLUME)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME)>0 ? 
           ::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request price value description                       |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqPriceDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_PRICE)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_PRICE)>0 ? 
           ::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_PRICE),this.m_digits) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request StopLimit order price description             |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqStopLimitDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_STOPLIMIT)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT)>0 ? 
           ::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT),this.m_digits) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request StopLoss order price description              |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqStopLossDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_SL)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL)>0 ? 
           ::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL),this.m_digits) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the request TakeProfit order price description            |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqTakeProfitDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_TP)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP)>0 ? 
           ::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP),this.m_digits) : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+
//| Return the description of a trading instrument name in a request |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqSymbolDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_SYMBOL)+": "+this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL);
  }
//+------------------------------------------------------------------+
//| Return the request order comment description                     |
//+------------------------------------------------------------------+
string CPendRequest::MqlReqCommentDescription(void) const
  {
   return CMessage::Text(MSG_LIB_TEXT_REQUEST_COMMENT)+": "+
          (this.GetProperty(PEND_REQ_PROP_MQL_REQ_COMMENT)!="" && this.GetProperty(PEND_REQ_PROP_MQL_REQ_COMMENT)!=NULL ? 
           "\""+this.GetProperty(PEND_REQ_PROP_MQL_REQ_COMMENT)+"\"" : 
           CMessage::Text(MSG_LIB_PROP_NOT_SET));
  }
//+------------------------------------------------------------------+

En los métodos, se comprueba el valor de la propiedad transmitida, se crea su descripción de texto y se retorna la línea de texto creada.

Para mostrar al completo en el diario todas las propiedades del objeto, tenemos el método Print():

//+------------------------------------------------------------------+
//| Display the pending request properties in the journal            |
//+------------------------------------------------------------------+
void CPendRequest::Print(const bool full_prop=false)
  {
   int header_code=
     (
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_OPEN   ? MSG_LIB_TEXT_PEND_REQUEST_STATUS_OPEN   :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_CLOSE  ? MSG_LIB_TEXT_PEND_REQUEST_STATUS_CLOSE  :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_SLTP   ? MSG_LIB_TEXT_PEND_REQUEST_STATUS_SLTP   :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_PLACE  ? MSG_LIB_TEXT_PEND_REQUEST_STATUS_PLACE  :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_REMOVE ? MSG_LIB_TEXT_PEND_REQUEST_STATUS_REMOVE :
      this.GetProperty(PEND_REQ_PROP_STATUS)==PEND_REQ_STATUS_MODIFY ? MSG_LIB_TEXT_PEND_REQUEST_STATUS_MODIFY :
      WRONG_VALUE
     );
   ::Print("============= \"",CMessage::Text(header_code),"\" =============");
   int beg=0, end=PEND_REQ_PROP_INTEGER_TOTAL;
   for(int i=beg; i<end; i++)
     {
      ENUM_PEND_REQ_PROP_INTEGER prop=(ENUM_PEND_REQ_PROP_INTEGER)i;
      if(!full_prop && !this.SupportProperty(prop)) continue;
      ::Print(this.GetPropertyDescription(prop));
     }
   ::Print("------");
   beg=end; end+=PEND_REQ_PROP_DOUBLE_TOTAL;
   for(int i=beg; i<end; i++)
     {
      ENUM_PEND_REQ_PROP_DOUBLE prop=(ENUM_PEND_REQ_PROP_DOUBLE)i;
      if(!full_prop && !this.SupportProperty(prop)) continue;
      ::Print(this.GetPropertyDescription(prop));
     }
   ::Print("------");
   beg=end; end+=PEND_REQ_PROP_STRING_TOTAL;
   for(int i=beg; i<end; i++)
     {
      ENUM_PEND_REQ_PROP_STRING prop=(ENUM_PEND_REQ_PROP_STRING)i;
      if(!full_prop && !this.SupportProperty(prop)) continue;
      ::Print(this.GetPropertyDescription(prop));
     }
   ::Print("================== ",CMessage::Text(MSG_LIB_PARAMS_LIST_END),": \"",CMessage::Text(header_code),"\" ==================\n");
  }
//+------------------------------------------------------------------+

Dado que hemos creado estos métodos para todos los objetos anteriores de la biblioteca y también hemos analizando su composición desde que comenzamos a describir la misma, aquí nos limitaremos a darle una breve descripción:
Vamos a iterar en tres ciclos por las tres matrices de propiedades del objeto, obteniendo cada próxima propiedad del objeto y mostrando su descripción, dependiendo de la bandera de muestra de las propiedades solo soportadas del objeto.

Hemos hecho virtual el método PrintShort(), creado para mostrar la descripción breve del objeto de solicitud. Este no hace nada en objeto básico, y debe redefinirse en los objetos herederos para que cada heredero pueda mostrar en el diario solo las propiedades que le pertenecen exclusivamente.

Ya hemos creado el objeto básico de solicitud pendiente.
A continuación, para precisar qué solicitud concreta se debe crear, tendremos que crear seis objetos herederos del objeto de solicitud abstracta. Precisamente estos se crearán en los métodos comerciales de la clase comercial al procesar los errores que requieren de tiempo de espera. También serán precisamente ellos los que se creen como órdenes comerciales independientes al crearse la lógica comercial con la ayuda de solicitudes comerciales pendientes.

Los objetos herederos del objeto de solicitud pendiente básico

Bien. En cada método comercial de la clase comercial tenemos bloques para la creación de solicitudes pendientes. Partiendo de la operación realizada por el método comercial, podemos crear las solicitudes pendientes correspondientes. Por ahora, sin embargo, solo tenemos la solicitud pendiente abstracta básica. Para crear sobre su base diferentes solicitudes comerciales según el tipo de operación ejecutada, deberemos crear seis herederos suyos, en los que cada clase heredada enviará al servidor solo la operación comercial que le es propia. Ya hemos hablado antes de la lista con estos objetos:

apertura de posición
modificación de órdenes stop de la posición abierta
cierre de posición
colocación de una orden pendiente
modificación de las propiedades de una orden pendiente
eliminación de una orden pendiente colcada con anterioridad

Como podemos recordar, en el constructor protegido de la solicitud pendiente abstracta básica hay un parámetro que indica el estado de la solicitud creada:

//--- Constructor paramétrico protegido
                     CPendRequest(const ENUM_PEND_REQ_STATUS status,
                                  const uchar id,
                                  const double price,
                                  const ulong time,
                                  const MqlTradeRequest &request,
                                  const int retcode);

Precisamente dicho estado vamos a indicar (transmitir desde el constructor del objeto heredado al constructor del objeto básico) al crear una nueva solicitud comercial. Con ello, también transmitiremos qué tipo de solicitud (según la operación ejecutada) estamos creando. Ya analizamos este comportamiento en el segundo artículo, al crear los objetos de órdenes y transacciones históricos. Por eso, no nos detendremos en ello: vamos a analizar directamente los seis objetos de solicitudes pendientes según el tipo de operación comercial realizada.
Crearemos todas las clases de los objetos herederos de la solicitud comercial básica en la misma carpeta en la que se encuentra el objeto básico:
\MQL5\Include\DoEasy\Objects\ PendRequest\

Clase del objeto de solicitud pendiente de apertura de posición (archivo de clase PendReqOpen.mqh):

//+------------------------------------------------------------------+
//|                                                  PendReqOpen.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include "PendRequest.mqh"
//+------------------------------------------------------------------+
//| Pending request for opening a position                           |
//+------------------------------------------------------------------+
class CPendReqOpen : public CPendRequest
  {
public:
//--- Constructor
                     CPendReqOpen(const uchar id,
                                  const double price,
                                  const ulong time,
                                  const MqlTradeRequest &request,
                                  const int retcode) : CPendRequest(PEND_REQ_STATUS_OPEN,id,price,time,request,retcode) {}
                                  
//--- Supported deal properties (1) real, (2) integer
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_STRING property);
//--- Display a brief message with request data in the journal
   virtual void      PrintShort(void);
  };
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| integer property, otherwise return 'false'                       |
//+------------------------------------------------------------------+
bool CPendReqOpen::SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   if(property==PEND_REQ_PROP_MQL_REQ_ORDER        ||
      property==PEND_REQ_PROP_MQL_REQ_POSITION     ||
      property==PEND_REQ_PROP_MQL_REQ_POSITION_BY  ||
      property==PEND_REQ_PROP_MQL_REQ_EXPIRATION   ||
      property==PEND_REQ_PROP_MQL_REQ_TYPE_TIME
     ) return false;
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| real property, otherwise return 'false'                          |
//+------------------------------------------------------------------+
bool CPendReqOpen::SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   return(property==PEND_REQ_PROP_MQL_REQ_STOPLIMIT ? false : true);
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| string property, otherwise return 'false'                        |
//+------------------------------------------------------------------+
bool CPendReqOpen::SupportProperty(ENUM_PEND_REQ_PROP_STRING property)
  {
   return true;
  }
//+------------------------------------------------------------------+
//| Display a brief message with request data in the journal         |
//+------------------------------------------------------------------+
void CPendReqOpen::PrintShort(void)
  {
   string params=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot)+" "+
                 OrderTypeDescription((ENUM_ORDER_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE));
   string price=CMessage::Text(MSG_LIB_TEXT_REQUEST_PRICE)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_PRICE),this.m_digits);
   string sl=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_SL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL),this.m_digits) : "";
   string tp=this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_TP)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP),this.m_digits) : "";
   string time=this.IDDescription()+", "+CMessage::Text(MSG_LIB_TEXT_CREATED)+" "+TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
   string attempts=CMessage::Text(MSG_LIB_TEXT_ATTEMPTS)+" "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
   string wait=CMessage::Text(MSG_LIB_TEXT_WAIT)+" "+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_SECONDS);
   string end=CMessage::Text(MSG_LIB_TEXT_END)+" "+
              TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE)+this.GetProperty(PEND_REQ_PROP_WAITING)*this.GetProperty(PEND_REQ_PROP_TOTAL));
   //---
   string message=CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS_OPEN)+": "+
   "\n- "+params+", "+price+sl+tp+
   "\n- "+time+", "+attempts+", "+wait+", "+end+"\n";
   ::Print(message);
  }
//+------------------------------------------------------------------+

El método es bastante primitivo. Lo único que hace es transmitir en la lista de inicialización de su constructor el estado del objeto creado (apertura de posición) y todos los parámetros de entrada de su constructor al constructor del objeto básico:

//--- Constructor
   CPendReqOpen(const uchar id,
                const double price,
                const ulong time,
                const MqlTradeRequest &request,
                const int retcode) : CPendRequest(PEND_REQ_STATUS_OPEN,id,price,time,request,retcode) {}

Métodos virtuales que retornan la bandera de soporte por parte del objeto de algunas propiedades de tipo entero, real y string:

//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| integer property, otherwise return 'false'                       |
//+------------------------------------------------------------------+
bool CPendReqOpen::SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   if(property==PEND_REQ_PROP_MQL_REQ_ORDER        ||
      property==PEND_REQ_PROP_MQL_REQ_POSITION     ||
      property==PEND_REQ_PROP_MQL_REQ_POSITION_BY  ||
      property==PEND_REQ_PROP_MQL_REQ_EXPIRATION   ||
      property==PEND_REQ_PROP_MQL_REQ_TYPE_TIME
     ) return false;
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| real property, otherwise return 'false'                          |
//+------------------------------------------------------------------+
bool CPendReqOpen::SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   return(property==PEND_REQ_PROP_MQL_REQ_STOPLIMIT ? false : true);
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| string property, otherwise return 'false'                        |
//+------------------------------------------------------------------+
bool CPendReqOpen::SupportProperty(ENUM_PEND_REQ_PROP_STRING property)
  {
   return true;
  }
//+------------------------------------------------------------------+

Si el objeto heredero de la solicitud comercial abstracta básica no soporta alguna propiedad, el método retornará false, de lo contrario, true. Ya hemos visto cómo funciona todo esto en el segundo artículo de la descripción de la biblioteca, al analizar la creación de los objetos de las órdenes y transacciones históricos.

Método virtual para crear y mostrar la descricpión breve de la solicitud:

//+------------------------------------------------------------------+
//| Display a brief message with request data in the journal         |
//+------------------------------------------------------------------+
void CPendReqOpen::PrintShort(void)
  {
   string params=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot)+" "+
                 OrderTypeDescription((ENUM_ORDER_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE));
   string price=CMessage::Text(MSG_LIB_TEXT_REQUEST_PRICE)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_PRICE),this.m_digits);
   string sl=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_SL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL),this.m_digits) : "";
   string tp=this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_TP)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP),this.m_digits) : "";
   string time=this.IDDescription()+", "+CMessage::Text(MSG_LIB_TEXT_CREATED)+" "+TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
   string attempts=CMessage::Text(MSG_LIB_TEXT_ATTEMPTS)+" "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
   string wait=CMessage::Text(MSG_LIB_TEXT_WAIT)+" "+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_SECONDS);
   string end=CMessage::Text(MSG_LIB_TEXT_END)+" "+
              TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE)+this.GetProperty(PEND_REQ_PROP_WAITING)*this.GetProperty(PEND_REQ_PROP_TOTAL));
   //---
   string message=CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS_OPEN)+": "+
   "\n- "+params+", "+price+sl+tp+
   "\n- "+time+", "+attempts+", "+wait+", "+end+"\n";
   ::Print(message);
  }
//+------------------------------------------------------------------+

En el método se crean líneas con la descripción de algunos parámetros usados por el objeto, así como un mensaje compuesto a partir de ellas, que luego se muestra en el diario. El método es virtual, y ha sido implementado a su manera en cada uno de los objetos herederos del objeto básico de la solicitud abstracta.

Clase del objeto de solicitud pendiente para la modificación de órdenes stop de una posición abierta (archivo de clase PendReqSLTP.mqh):

//+------------------------------------------------------------------+
//|                                                  PendReqSLTP.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include "PendRequest.mqh"
//+------------------------------------------------------------------+
//| Pending request to modify position stop orders                   |
//+------------------------------------------------------------------+
class CPendReqSLTP : public CPendRequest
  {
public:
//--- Constructor
                     CPendReqSLTP(const uchar id,
                                  const double price,
                                  const ulong time,
                                  const MqlTradeRequest &request,
                                  const int retcode) : CPendRequest(PEND_REQ_STATUS_SLTP,id,price,time,request,retcode) {}
                                  
//--- Supported deal properties (1) real, (2) integer
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_STRING property);
//--- Display a brief message with request data in the journal
   virtual void      PrintShort(void);
  };
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| integer property, otherwise return 'false'                       |
//+------------------------------------------------------------------+
bool CPendReqSLTP::SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   if(property==PEND_REQ_PROP_MQL_REQ_POSITION_BY  ||
      property==PEND_REQ_PROP_MQL_REQ_ORDER        ||
      property==PEND_REQ_PROP_MQL_REQ_EXPIRATION   ||
      property==PEND_REQ_PROP_MQL_REQ_DEVIATION    ||
      property==PEND_REQ_PROP_MQL_REQ_TYPE_FILLING ||
      property==PEND_REQ_PROP_MQL_REQ_TYPE_TIME
     ) return false;
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| real property, otherwise return 'false'                          |
//+------------------------------------------------------------------+
bool CPendReqSLTP::SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   if(property==PEND_REQ_PROP_PRICE_CREATE         ||
      property==PEND_REQ_PROP_MQL_REQ_SL           ||
      property==PEND_REQ_PROP_MQL_REQ_TP
     ) return true;
   return false;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| string property, otherwise return 'false'                        |
//+------------------------------------------------------------------+
bool CPendReqSLTP::SupportProperty(ENUM_PEND_REQ_PROP_STRING property)
  {
   return true;
  }
//+------------------------------------------------------------------+
//| Display a brief message with request data in the journal         |
//+------------------------------------------------------------------+
void CPendReqSLTP::PrintShort(void)
  {
   string params=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot)+" "+
                 PositionTypeDescription((ENUM_POSITION_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE))+" #"+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION);
   string sl=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_SL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL),this.m_digits) : "";
   string tp=this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_TP)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP),this.m_digits) : "";
   string time=this.IDDescription()+", "+CMessage::Text(MSG_LIB_TEXT_CREATED)+" "+TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
   string attempts=CMessage::Text(MSG_LIB_TEXT_ATTEMPTS)+" "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
   string wait=CMessage::Text(MSG_LIB_TEXT_WAIT)+" "+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_SECONDS);
   string end=CMessage::Text(MSG_LIB_TEXT_END)+" "+
              TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE)+this.GetProperty(PEND_REQ_PROP_WAITING)*this.GetProperty(PEND_REQ_PROP_TOTAL));
   //---
   string message=CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS_SLTP)+": "+
   "\n- "+params+sl+tp+
   "\n- "+time+", "+attempts+", "+wait+", "+end+"\n";
   ::Print(message);
  }
//+------------------------------------------------------------------+

Clase del objeto de solicitud pendiente de cierre de posición (archivo de clase PendReqClose.mqh):

//+------------------------------------------------------------------+
//|                                                 PendReqClose.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include "PendRequest.mqh"
//+------------------------------------------------------------------+
//| Pending request to close a position                              |
//+------------------------------------------------------------------+
class CPendReqClose : public CPendRequest
  {
public:
//--- Constructor
                     CPendReqClose(const uchar id,
                                   const double price,
                                   const ulong time,
                                   const MqlTradeRequest &request,
                                   const int retcode) : CPendRequest(PEND_REQ_STATUS_CLOSE,id,price,time,request,retcode) {}
                                  
//--- Supported deal properties (1) real, (2) integer
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_STRING property);
//--- Display a brief message with request data in the journal
   virtual void      PrintShort(void);
  };
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| integer property, otherwise return 'false'                       |
//+------------------------------------------------------------------+
bool CPendReqClose::SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   if((
      property==PEND_REQ_PROP_MQL_REQ_POSITION_BY  && 
      this.GetProperty(property)==0)               ||
      property==PEND_REQ_PROP_MQL_REQ_ORDER        ||
      property==PEND_REQ_PROP_MQL_REQ_EXPIRATION   ||
      property==PEND_REQ_PROP_MQL_REQ_TYPE_TIME
     ) return false;
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| real property, otherwise return 'false'                          |
//+------------------------------------------------------------------+
bool CPendReqClose::SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   if(property==PEND_REQ_PROP_MQL_REQ_STOPLIMIT    ||
      property==PEND_REQ_PROP_MQL_REQ_SL           ||
      property==PEND_REQ_PROP_MQL_REQ_TP
     ) return false;
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| string property, otherwise return 'false'                        |
//+------------------------------------------------------------------+
bool CPendReqClose::SupportProperty(ENUM_PEND_REQ_PROP_STRING property)
  {
   return true;
  }
//+------------------------------------------------------------------+
//| Display a brief message with request data in the journal         |
//+------------------------------------------------------------------+
void CPendReqClose::PrintShort(void)
  {
   string params=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot)+" "+
                 PositionTypeDescription((ENUM_POSITION_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE))+" #"+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION);
   string pos_by=(this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION_BY)>0 ? ", "+CMessage::Text(MSG_ORD_DEAL_OUT_BY)+" #"+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_POSITION_BY) : "");
   string price=CMessage::Text(MSG_LIB_TEXT_REQUEST_PRICE)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_PRICE_CREATE),this.m_digits);
   string time=this.IDDescription()+", "+CMessage::Text(MSG_LIB_TEXT_CREATED)+" "+TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
   string attempts=CMessage::Text(MSG_LIB_TEXT_ATTEMPTS)+" "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
   string wait=CMessage::Text(MSG_LIB_TEXT_WAIT)+" "+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_SECONDS);
   string end=CMessage::Text(MSG_LIB_TEXT_END)+" "+
              TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE)+this.GetProperty(PEND_REQ_PROP_WAITING)*this.GetProperty(PEND_REQ_PROP_TOTAL));
   //---
   string message=CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS_CLOSE)+": "+
   "\n- "+params+", "+price+pos_by+
   "\n- "+time+", "+attempts+", "+wait+", "+end+"\n";
   ::Print(message);
  }
//+------------------------------------------------------------------+

Clase del objeto de solicitud pendiente para la colocación de órdenes pendientes (archivo de clase PendReqPlace.mqh):

//+------------------------------------------------------------------+
//|                                                 PendReqPlace.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include "PendRequest.mqh"
//+------------------------------------------------------------------+
//| Pending request to place a pending order                         |
//+------------------------------------------------------------------+
class CPendReqPlace : public CPendRequest
  {
public:
//--- Constructor
                     CPendReqPlace(const uchar id,
                                   const double price,
                                   const ulong time,
                                   const MqlTradeRequest &request,
                                   const int retcode) : CPendRequest(PEND_REQ_STATUS_PLACE,id,price,time,request,retcode) {}
                                  
//--- Supported deal properties (1) real, (2) integer
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_STRING property);
//--- Display a brief message with request data in the journal
   virtual void      PrintShort(void);
  };
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| integer property, otherwise return 'false'                       |
//+------------------------------------------------------------------+
bool CPendReqPlace::SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   if(property==PEND_REQ_PROP_MQL_REQ_ORDER        ||
      property==PEND_REQ_PROP_MQL_REQ_POSITION     ||
      property==PEND_REQ_PROP_MQL_REQ_POSITION_BY  ||
      property==PEND_REQ_PROP_MQL_REQ_DEVIATION
     ) return false;
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| real property, otherwise return 'false'                          |
//+------------------------------------------------------------------+
bool CPendReqPlace::SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| string property, otherwise return 'false'                        |
//+------------------------------------------------------------------+
bool CPendReqPlace::SupportProperty(ENUM_PEND_REQ_PROP_STRING property)
  {
   return true;
  }
//+------------------------------------------------------------------+
//| Display a brief message with request data in the journal         |
//+------------------------------------------------------------------+
void CPendReqPlace::PrintShort(void)
  {
   string params=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot)+" "+
                 OrderTypeDescription((ENUM_ORDER_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE));
   string price=CMessage::Text(MSG_LIB_TEXT_REQUEST_PRICE)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_PRICE),this.m_digits);
   string stoplimit=this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_STOPLIMIT)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT),this.m_digits) : "";
   string sl=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_SL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL),this.m_digits) : "";
   string tp=this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_TP)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP),this.m_digits) : "";
   string time=this.IDDescription()+", "+CMessage::Text(MSG_LIB_TEXT_CREATED)+" "+TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
   string attempts=CMessage::Text(MSG_LIB_TEXT_ATTEMPTS)+" "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
   string wait=CMessage::Text(MSG_LIB_TEXT_WAIT)+" "+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_SECONDS);
   string end=CMessage::Text(MSG_LIB_TEXT_END)+" "+
              TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE)+this.GetProperty(PEND_REQ_PROP_WAITING)*this.GetProperty(PEND_REQ_PROP_TOTAL));
   //---
   string message=CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS_PLACE)+": "+
   "\n- "+params+", "+price+stoplimit+sl+tp+
   "\n- "+time+", "+attempts+", "+wait+", "+end+"\n";
   ::Print(message);
  }
//+------------------------------------------------------------------+

Clase del objeto de solicitud pendiente para la modificación de los parámetros de una orden pendiente colocada (archivo de clase PendReqModify.mqh):

//+------------------------------------------------------------------+
//|                                                PendReqModify.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include "PendRequest.mqh"
//+------------------------------------------------------------------+
//| Pending request to modify pending order parameters               |
//+------------------------------------------------------------------+
class CPendReqModify : public CPendRequest
  {
public:
//--- Constructor
                     CPendReqModify(const uchar id,
                                    const double price,
                                    const ulong time,
                                    const MqlTradeRequest &request,
                                    const int retcode) : CPendRequest(PEND_REQ_STATUS_MODIFY,id,price,time,request,retcode) {}
                                  
//--- Supported deal properties (1) real, (2) integer
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_STRING property);
//--- Display a brief message with request data in the journal
   virtual void      PrintShort(void);
  };
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| integer property, otherwise return 'false'                       |
//+------------------------------------------------------------------+
bool CPendReqModify::SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   if(property==PEND_REQ_PROP_MQL_REQ_POSITION     ||
      property==PEND_REQ_PROP_MQL_REQ_POSITION_BY  ||
      property==PEND_REQ_PROP_MQL_REQ_DEVIATION
     ) return false;
   return true;
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| real property, otherwise return 'false'                          |
//+------------------------------------------------------------------+
bool CPendReqModify::SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   return(property==PEND_REQ_PROP_MQL_REQ_VOLUME ? false : true);
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| string property, otherwise return 'false'                        |
//+------------------------------------------------------------------+
bool CPendReqModify::SupportProperty(ENUM_PEND_REQ_PROP_STRING property)
  {
   return true;
  }
//+------------------------------------------------------------------+
//| Display a brief message with request data in the journal         |
//+------------------------------------------------------------------+
void CPendReqModify::PrintShort(void)
  {
   string params=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot)+" "+
                 OrderTypeDescription((ENUM_ORDER_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE))+" #"+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_ORDER);
   string price=CMessage::Text(MSG_LIB_TEXT_REQUEST_PRICE)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_PRICE),this.m_digits);
   string stoplimit=this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_STOPLIMIT)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT),this.m_digits) : "";
   string sl=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_SL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_SL),this.m_digits) : "";
   string tp=this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_TP)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_TP),this.m_digits) : "";
   string expiration=this.GetProperty(PEND_REQ_PROP_MQL_REQ_EXPIRATION)>0 ? this.MqlReqExpirationDescription() : "";
   string type_filling=this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE_FILLING)>WRONG_VALUE ? "\n- "+this.MqlReqTypeFillingDescription() : "";
   string type_time=this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE_TIME)>WRONG_VALUE ? "\n- "+this.MqlReqTypeTimeDescription() : "";
   string time=this.IDDescription()+", "+CMessage::Text(MSG_LIB_TEXT_CREATED)+" "+TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
   string attempts=CMessage::Text(MSG_LIB_TEXT_ATTEMPTS)+" "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
   string wait=CMessage::Text(MSG_LIB_TEXT_WAIT)+" "+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_SECONDS);
   string end=CMessage::Text(MSG_LIB_TEXT_END)+" "+
              TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE)+this.GetProperty(PEND_REQ_PROP_WAITING)*this.GetProperty(PEND_REQ_PROP_TOTAL));
   //---
   string message=CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS_MODIFY)+": "+
   "\n- "+params+", "+price+stoplimit+sl+tp+expiration+type_filling+type_time+
   "\n- "+time+", "+attempts+", "+wait+", "+end+"\n";
   ::Print(message);
  }
//+------------------------------------------------------------------+

Clase del objeto de solicitud pendiente para la eliminación de una orden pendiente (archivo de clase PendReqRemove.mqh):

//+------------------------------------------------------------------+
//|                                                PendReqRemove.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include "PendRequest.mqh"
//+------------------------------------------------------------------+
//| Pending request to remove a pending order                        |
//+------------------------------------------------------------------+
class CPendReqRemove : public CPendRequest
  {
public:
//--- Constructor
                     CPendReqRemove(const uchar id,
                                    const double price,
                                    const ulong time,
                                    const MqlTradeRequest &request,
                                    const int retcode) : CPendRequest(PEND_REQ_STATUS_REMOVE,id,price,time,request,retcode) {}
                                  
//--- Supported deal properties (1) real, (2) integer
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property);
   virtual bool      SupportProperty(ENUM_PEND_REQ_PROP_STRING property);
//--- Display a brief message with request data in the journal
   virtual void      PrintShort(void);
  };
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| integer property, otherwise return 'false'                       |
//+------------------------------------------------------------------+
bool CPendReqRemove::SupportProperty(ENUM_PEND_REQ_PROP_INTEGER property)
  {
   return(property>PEND_REQ_PROP_MQL_REQ_ORDER ? false : true);
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| real property, otherwise return 'false'                          |
//+------------------------------------------------------------------+
bool CPendReqRemove::SupportProperty(ENUM_PEND_REQ_PROP_DOUBLE property)
  {
   return(property==PEND_REQ_PROP_PRICE_CREATE || property==PEND_REQ_PROP_MQL_REQ_PRICE ? true : false);
  }
//+------------------------------------------------------------------+
//| Return 'true' if an order supports a passed                      |
//| string property, otherwise return 'false'                        |
//+------------------------------------------------------------------+
bool CPendReqRemove::SupportProperty(ENUM_PEND_REQ_PROP_STRING property)
  {
   return true;
  }
//+------------------------------------------------------------------+
//| Display a brief message with request data in the journal         |
//+------------------------------------------------------------------+
void CPendReqRemove::PrintShort(void)
  {
   string params=this.GetProperty(PEND_REQ_PROP_MQL_REQ_SYMBOL)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_VOLUME),this.m_digits_lot)+" "+
                 OrderTypeDescription((ENUM_ORDER_TYPE)this.GetProperty(PEND_REQ_PROP_MQL_REQ_TYPE))+" #"+(string)this.GetProperty(PEND_REQ_PROP_MQL_REQ_ORDER);
   string price=CMessage::Text(MSG_LIB_TEXT_REQUEST_PRICE)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_PRICE),this.m_digits);
   string stoplimit=this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT)>0 ? ", "+CMessage::Text(MSG_LIB_TEXT_REQUEST_STOPLIMIT)+" "+::DoubleToString(this.GetProperty(PEND_REQ_PROP_MQL_REQ_STOPLIMIT),this.m_digits) : "";
   string time=this.IDDescription()+", "+CMessage::Text(MSG_LIB_TEXT_CREATED)+" "+TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE));
   string attempts=CMessage::Text(MSG_LIB_TEXT_ATTEMPTS)+" "+(string)this.GetProperty(PEND_REQ_PROP_TOTAL);
   string wait=CMessage::Text(MSG_LIB_TEXT_WAIT)+" "+::TimeToString(this.GetProperty(PEND_REQ_PROP_WAITING)/1000,TIME_SECONDS);
   string end=CMessage::Text(MSG_LIB_TEXT_END)+" "+
              TimeMSCtoString(this.GetProperty(PEND_REQ_PROP_TIME_CREATE)+this.GetProperty(PEND_REQ_PROP_WAITING)*this.GetProperty(PEND_REQ_PROP_TOTAL));
   //---
   string message=CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_STATUS_REMOVE)+": "+
   "\n- "+params+", "+price+stoplimit+
   "\n- "+time+", "+attempts+", "+wait+", "+end+"\n";
   ::Print(message);
  }
//+------------------------------------------------------------------+

La característica que distingue todas estas clases unas de otras es la transmisión del estado de la solicitud pendiente al constructor del objeto padre: precisamente el estado define qué tipo de operación comercial realizará cada uno de estos objetos. Los demás métodos de las clases tienen solo un carácter auxiliar, y no influyen en el resultado comercial.

Con esto, hemos terminado la creación de las nuevas clases de las solicitudes comerciales pendientes.
Ahora, debemos eliminar la clase de solicitud pendiente que hemos creado temporalmente del archivo de la clase comercial e introducir correcciones adicionales para trabajar con los nuevos objetos de solicitudes comerciales pendientes.

Abrimos el archivo Trading.mqh y eliminamos completamente de su listado la antigua clase de solicitud pendiente:

//+------------------------------------------------------------------+
//|                                                      Trading.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include <Arrays\ArrayInt.mqh>
#include "Objects\Trade\TradeObj.mqh"
#include "Collections\AccountsCollection.mqh"
#include "Collections\SymbolsCollection.mqh"
#include "Collections\MarketCollection.mqh"
#include "Collections\HistoryCollection.mqh"
#include "Collections\EventsCollection.mqh"
//+-----------------------------------------------------------------+
//| Pending request object class                                     |
//+------------------------------------------------------------------+
class CPendingReq : public CObject
  {
private:
   MqlTradeRequest      m_request;                       // Trade request structure
   uchar                m_id;                            // Trading request ID
   int                  m_type;                          // Pending request type
   int                  m_retcode;                       // Result a request is based on
   double               m_price_create;                  // Price at the moment of a request generation
   ulong                m_time_create;                   // Request generation time
   ulong                m_time_activate;                 // Next attempt activation time
   ulong                m_waiting_msc;                   // Waiting time between requests
   uchar                m_current_attempt;               // Current attempt index
   uchar                m_total_attempts;                // Number of attempts
//--- Copy trading request data
   void                 CopyRequest(const MqlTradeRequest &request)  { this.m_request=request;        }
//--- Compare CPendingReq objects by IDs
   virtual int          Compare(const CObject *node,const int mode=0) const;

public:
//--- Return (1) the request structure, (2) the price at the moment of the request generation,
//--- (3) request generation time, (4) next attempt activation time,
//--- (5) waiting time between requests, (6) current attempt index,
//--- (7) number of attempts, (8) request ID
//--- (9) result a request is based on,
//--- (10) order ticket, (11) position ticket, (12) trading operation type
   MqlTradeRequest      MqlRequest(void)                       const { return this.m_request;         }
   double               PriceCreate(void)                      const { return this.m_price_create;    }
   ulong                TimeCreate(void)                       const { return this.m_time_create;     }
   ulong                TimeActivate(void)                     const { return this.m_time_activate;   }
   ulong                WaitingMSC(void)                       const { return this.m_waiting_msc;     }
   uchar                CurrentAttempt(void)                   const { return this.m_current_attempt; }
   uchar                TotalAttempts(void)                    const { return this.m_total_attempts;  }
   uchar                ID(void)                               const { return this.m_id;              }
   int                  Retcode(void)                          const { return this.m_retcode;         }
   ulong                Order(void)                            const { return this.m_request.order;   }
   ulong                Position(void)                         const { return this.m_request.position;}
   ENUM_TRADE_REQUEST_ACTIONS Action(void)                     const { return this.m_request.action;  }

//--- Set (1) the price when creating a request, (2) request creation time,
//--- (3) current attempt time, (4) waiting time between requests,
//--- (5) current attempt index, (6) number of attempts, (7) ID,
//--- (8) order ticket, (9) position ticket
   void                 SetPriceCreate(const double price)           { this.m_price_create=price;     }
   void                 SetTimeCreate(const ulong time)              { this.m_time_create=time;       }
   void                 SetTimeActivate(const ulong time)            { this.m_time_activate=time;     }
   void                 SetWaitingMSC(const ulong miliseconds)       { this.m_waiting_msc=miliseconds;}
   void                 SetCurrentAttempt(const uchar number)        { this.m_current_attempt=number; }
   void                 SetTotalAttempts(const uchar number)         { this.m_total_attempts=number;  }
   void                 SetID(const uchar id)                        { this.m_id=id;                  }
   void                 SetOrder(const ulong ticket)                 { this.m_request.order=ticket;   }
   void                 SetPosition(const ulong ticket)              { this.m_request.position=ticket;}
   
//--- Return the description of the (1) request structure, (2) the price at the moment of the request generation,
//--- (3) request generation time, (4) current attempt time,
//--- (5) waiting time between requests, (6) current attempt index,
//--- (7) number of attempts, (8) request ID
   string               MqlRequestDescription(void)            const { return RequestActionDescription(this.m_request); }
   string               TypeDescription(void)                  const
                          { 
                           return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TYPE) +
                             (this.Type()==PENDING_REQUEST_ID_TYPE_ERR           ?
                              CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_BY_ERROR) :
                              CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_BY_REQUEST)
                             );
                          }
   string               PriceCreateDescription(void)           const 
                          {
                           return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_PRICE_CREATE)+": "+
                                  ::DoubleToString(this.PriceCreate(),(int)::SymbolInfoInteger(this.m_request.symbol,SYMBOL_DIGITS));
                          }
   string               TimeCreateDescription(void)            const { return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TIME_CREATE)+TimeMSCtoString(this.TimeCreate());    }
   string               TimeActivateDescription(void)          const { return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TIME_ACTIVATE)+TimeMSCtoString(this.TimeActivate());}
   string               WaitingMSCDescription(void)            const { return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_WAITING)+(string)this.WaitingMSC();                 }
   string               CurrentAttemptDescription(void)        const 
                          {
                           return
                             (CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_CURRENT_ATTEMPT)+
                              (this.CurrentAttempt()==0 ? CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_WAITING_ONSET) : (string)this.CurrentAttempt())
                             );
                          }
   string               TotalAttemptsDescription(void)         const { return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_TOTAL_ATTEMPTS)+(string)this.TotalAttempts();       }
   string               IdDescription(void)                    const { return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_ID)+"#"+(string)this.ID();                          }
   string               RetcodeDescription(void)               const { return CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_RETCODE)+(string)this.Retcode();                    }
   string               ReasonDescription(void)                const { return CMessage::Text(this.m_retcode);  }

//--- Return a request type
   virtual int          Type(void)                             const { return this.m_type;   }
//--- Display request data in the journal
   void                 Print(void);
//--- Constructors
                        CPendingReq(void){;}
                        CPendingReq(const uchar id,const double price,const ulong time,const MqlTradeRequest &request,const int retcode);
  };
//+------------------------------------------------------------------+
//| Parametric constructor                                           |
//+------------------------------------------------------------------+
CPendingReq::CPendingReq(const uchar id,const double price,const ulong time,const MqlTradeRequest &request,const int retcode) : m_price_create(price),
                                                                                                                                m_time_create(time),
                                                                                                                                m_id(id),
                                                                                                                                m_retcode(retcode)
  {
   this.CopyRequest(request);
   this.m_type=(retcode>0 ? PENDING_REQUEST_ID_TYPE_ERR : PENDING_REQUEST_ID_TYPE_REQ);
  }
//+------------------------------------------------------------------+
//| Compare CPendingReq objects by properties                        |
//+------------------------------------------------------------------+
int CPendingReq::Compare(const CObject *node,const int mode=0) const
  {
   const CPendingReq *compared_req=node;
   return
     (
      //--- Compare by ID
      mode==SORT_BY_PEND_REQ_ID        ?  
      (this.ID()>compared_req.ID()     ? 1 : this.ID()<compared_req.ID() ? -1 : 0)     :
      //--- Compare by type
      mode==SORT_BY_PEND_REQ_TYPE      ?  
      (this.Type()>compared_req.Type() ? 1 : this.Type()<compared_req.Type() ? -1 : 0) :
      //--- Compare by ticket
      (
       //--- modifying position sl, tp, opening/closing a position or closing by an opposite one
       this.m_request.action==TRADE_ACTION_SLTP    || this.m_request.action==TRADE_ACTION_DEAL     || this.m_request.action==TRADE_ACTION_CLOSE_BY ?
       (this.m_request.position>compared_req.m_request.position ? 1 : this.m_request.position<compared_req.m_request.position ? -1 : 0)            :
       //--- modifying parameters, placing/removing a pending order
       this.m_request.action==TRADE_ACTION_MODIFY  || this.m_request.action==TRADE_ACTION_PENDING  || this.m_request.action==TRADE_ACTION_REMOVE   ?
       (this.m_request.order>compared_req.m_request.order ? 1 : this.m_request.order<compared_req.m_request.order ? -1 : 0)                        : 
       //--- otherwise
       0
      )
     );
  }
//+------------------------------------------------------------------+
//| Display request data in the journal                              |
//+------------------------------------------------------------------+
void CPendingReq::Print(void)
  {
   string action=" - "+RequestActionDescription(this.m_request)+"\n";
   string symbol="",order="",volume="",price="",stoplimit="",sl="",tp="",deviation="",type="",type_filling="";
   string type_time="",expiration="",position="",position_by="",magic="",comment="",request_data="";
   string type_req=" - "+this.TypeDescription()+"\n";
   
   if(this.m_request.action==TRADE_ACTION_DEAL)
     {
      symbol=" - "+RequestSymbolDescription(this.m_request)+"\n";
      volume=" - "+RequestVolumeDescription(this.m_request)+"\n";
      price=" - "+RequestPriceDescription(this.m_request)+"\n";
      sl=" - "+RequestStopLossDescription(this.m_request)+"\n";
      tp=" - "+RequestTakeProfitDescription(this.m_request)+"\n";
      deviation=" - "+RequestDeviationDescription(this.m_request)+"\n";
      type=" - "+RequestTypeDescription(this.m_request)+"\n";
      type_filling=" - "+RequestTypeFillingDescription(this.m_request)+"\n";
      magic=" - "+RequestMagicDescription(this.m_request)+"\n";
      comment=" - "+RequestCommentDescription(this.m_request)+"\n";
      request_data=
        ("================== "+
         CMessage::Text(MSG_LIB_TEXT_REQUEST_DATAS)+" ==================\n"+
         action+symbol+volume+price+sl+tp+deviation+type+type_filling+magic+comment+
         " ==================\n"
        );
     }
   else if(this.m_request.action==TRADE_ACTION_SLTP)
     {
      symbol=" - "+RequestSymbolDescription(this.m_request)+"\n";
      sl=" - "+RequestStopLossDescription(this.m_request)+"\n";
      tp=" - "+RequestTakeProfitDescription(this.m_request)+"\n";
      position=" - "+RequestPositionDescription(this.m_request)+"\n";
      request_data=
        ("================== "+
         CMessage::Text(MSG_LIB_TEXT_REQUEST_DATAS)+" ==================\n"+
         action+symbol+sl+tp+position+
         " ==================\n"
        );
     }
   else if(this.m_request.action==TRADE_ACTION_PENDING)
     {
      symbol=" - "+RequestSymbolDescription(this.m_request)+"\n";
      volume=" - "+RequestVolumeDescription(this.m_request)+"\n";
      price=" - "+RequestPriceDescription(this.m_request)+"\n";
      stoplimit=" - "+RequestStopLimitDescription(this.m_request)+"\n";
      sl=" - "+RequestStopLossDescription(this.m_request)+"\n";
      tp=" - "+RequestTakeProfitDescription(this.m_request)+"\n";
      type=" - "+RequestTypeDescription(this.m_request)+"\n";
      type_filling=" - "+RequestTypeFillingDescription(this.m_request)+"\n";
      type_time=" - "+RequestTypeTimeDescription(this.m_request)+"\n";
      expiration=" - "+RequestExpirationDescription(this.m_request)+"\n";
      magic=" - "+RequestMagicDescription(this.m_request)+"\n";
      comment=" - "+RequestCommentDescription(this.m_request)+"\n";
      request_data=
        ("================== "+
         CMessage::Text(MSG_LIB_TEXT_REQUEST_DATAS)+" ==================\n"+
         action+symbol+volume+price+stoplimit+sl+tp+type+type_filling+type_time+expiration+magic+comment+
         " ==================\n"
        );
     }
   else if(this.m_request.action==TRADE_ACTION_MODIFY)
     {
      order=" - "+RequestOrderDescription(this.m_request)+"\n";
      price=" - "+RequestPriceDescription(this.m_request)+"\n";
      sl=" - "+RequestStopLossDescription(this.m_request)+"\n";
      tp=" - "+RequestTakeProfitDescription(this.m_request)+"\n";
      type_time=" - "+RequestTypeTimeDescription(this.m_request)+"\n";
      expiration=" - "+RequestExpirationDescription(this.m_request)+"\n";
      request_data=
        ("================== "+
         CMessage::Text(MSG_LIB_TEXT_REQUEST_DATAS)+" ==================\n"+
         action+order+price+sl+tp+type_time+expiration+
         " ==================\n"
        );
     }
   else if(this.m_request.action==TRADE_ACTION_REMOVE)
     {
      order=" - "+RequestOrderDescription(this.m_request)+"\n";
      request_data=
        ("================== "+
         CMessage::Text(MSG_LIB_TEXT_REQUEST_DATAS)+" ==================\n"+
         action+order+
         " ==================\n"
        );
     }
   else if(this.m_request.action==TRADE_ACTION_CLOSE_BY)
     {
      position=" - "+RequestPositionDescription(this.m_request)+"\n";
      position_by=" - "+RequestPositionByDescription(this.m_request)+"\n";
      magic=" - "+RequestMagicDescription(this.m_request)+"\n";
      request_data=
        ("================== "+
         CMessage::Text(MSG_LIB_TEXT_REQUEST_DATAS)+" ==================\n"+
         action+position+position_by+magic+
         " ==================\n"
        );
     }
   string datas=
     (
      " - "+this.TypeDescription()+"\n"+
      " - "+this.IdDescription()+"\n"+
      " - "+this.RetcodeDescription()+" \""+this.ReasonDescription()+"\"\n"+
      " - "+this.TimeCreateDescription()+"\n"+
      " - "+this.PriceCreateDescription()+"\n"+
      " - "+this.TimeActivateDescription()+"\n"+
      " - "+this.WaitingMSCDescription()+" ("+TimeToString(this.WaitingMSC()/1000,TIME_MINUTES|TIME_SECONDS)+")"+"\n"+
      " - "+this.CurrentAttemptDescription()+"\n"+
      " - "+this.TotalAttemptsDescription()+"\n"
     );
   ::Print("================== ",CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_DATAS)," ==================\n",datas,request_data);
  }
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+
//| Trading class                                                    |
//+------------------------------------------------------------------+
class CTrading
  {

Para que la clase comercial pueda ver los objetos de las nuevas clases de solicitudes pendientes, las incluiremos al listado del archivo de la clase comercial:

//+------------------------------------------------------------------+
//|                                                      Trading.mqh |
//|                        Copyright 2019, MetaQuotes Software Corp. |
//|                             https://mql5.com/es/users/artmedia70 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, MetaQuotes Software Corp."
#property link      "https://mql5.com/es/users/artmedia70"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Archivos de inclusión                                            |
//+------------------------------------------------------------------+
#include <Arrays\ArrayInt.mqh>
#include "Objects\Trade\TradeObj.mqh"
#include "Objects\PendRequest\PendReqOpen.mqh"
#include "Objects\PendRequest\PendReqSLTP.mqh"
#include "Objects\PendRequest\PendReqClose.mqh"
#include "Objects\PendRequest\PendReqPlace.mqh"
#include "Objects\PendRequest\PendReqModify.mqh"
#include "Objects\PendRequest\PendReqRemove.mqh"
#include "Collections\AccountsCollection.mqh"
#include "Collections\SymbolsCollection.mqh"
#include "Collections\MarketCollection.mqh"
#include "Collections\HistoryCollection.mqh"
#include "Collections\EventsCollection.mqh"
//+------------------------------------------------------------------+

En el método de creación de una nueva solicitud pendiente, ahora transmitiremos de forma adicional el estado de la solicitud comercial creada.
Escribimos el estado en la declaración del método:

//--- Create a pending request
   bool                 CreatePendingRequest(const ENUM_PEND_REQ_STATUS status,
                                             const uchar id,
                                             const uchar attempts,
                                             const ulong wait,
                                             const MqlTradeRequest &request,
                                             const int retcode,
                                             CSymbol *symbol_obj);

Y corregimos la implementación del método de creación de una nueva solicitud pendiente:

//+------------------------------------------------------------------+
//| Create a pending request                                         |
//+------------------------------------------------------------------+
bool CTrading::CreatePendingRequest(const ENUM_PEND_REQ_STATUS status,
                                    const uchar id,
                                    const uchar attempts,
                                    const ulong wait,
                                    const MqlTradeRequest &request,
                                    const int retcode,
                                    CSymbol *symbol_obj)
  {
   //--- Create a new pending request object depending on a request status
   CPendRequest *req_obj=NULL;
   switch(status)
     {
      case PEND_REQ_STATUS_OPEN     : req_obj=new CPendReqOpen(id,symbol_obj.BidLast(),symbol_obj.Time(),request,retcode);    break;
      case PEND_REQ_STATUS_CLOSE    : req_obj=new CPendReqClose(id,symbol_obj.BidLast(),symbol_obj.Time(),request,retcode);   break;
      case PEND_REQ_STATUS_SLTP     : req_obj=new CPendReqSLTP(id,symbol_obj.BidLast(),symbol_obj.Time(),request,retcode);    break;
      case PEND_REQ_STATUS_PLACE    : req_obj=new CPendReqPlace(id,symbol_obj.BidLast(),symbol_obj.Time(),request,retcode);   break;
      case PEND_REQ_STATUS_REMOVE   : req_obj=new CPendReqRemove(id,symbol_obj.BidLast(),symbol_obj.Time(),request,retcode);  break;
      case PEND_REQ_STATUS_MODIFY   : req_obj=new CPendReqModify(id,symbol_obj.BidLast(),symbol_obj.Time(),request,retcode);  break;
      default: req_obj=NULL;
        break;
     }
   if(req_obj==NULL)
     {
      if(this.m_log_level>LOG_LEVEL_NO_MSG)
         ::Print(DFUN,CMessage::Text(MSG_LIB_TEXT_FAILING_CREATE_PENDING_REQ));
      return false;
     }
   //--- If failed to add the request to the list, display the appropriate message,
   //--- remove the created object and return 'false'
   if(!this.m_list_request.Add(req_obj))
     {
      if(this.m_log_level>LOG_LEVEL_NO_MSG)
         ::Print(DFUN,CMessage::Text(MSG_LIB_TEXT_FAILING_CREATE_PENDING_REQ));
      delete req_obj;
      return false;
     }
   //--- Filled in the fields of a successfully created object by the values passed to the method
   req_obj.SetTimeActivate(symbol_obj.Time()+wait);
   req_obj.SetWaitingMSC(wait);
   req_obj.SetCurrentAttempt(0);
   req_obj.SetTotalAttempts(attempts);
   
   //--- Display a brief description of a created pending request
   if(this.m_log_level>LOG_LEVEL_NO_MSG)
     {
      ::Print(CMessage::Text(MSG_LIB_TEXT_PEND_REQUEST_CREATED)," #",req_obj.ID(),":");
      req_obj.PrintShort();
     }
   //--- successful
   return true;
  }
//+------------------------------------------------------------------+

Ahora, al método se le transmite adicionalmente el estado del objeto creado de solicitud pendiente.
Antes, nuestro objeto de solicitud pendiente tenía el tipo de clase CPendingReq. Esta clase ha sido ahora eliminada por completo, pues tenemos la nueva clase de objeto de solicitud pendiente CPendRequest y sus herederos.
De esta forma, aquí, al crear un objeto vacío, usaremos el nuevo objeto de solicitud abstracta básica CPendRequest.
A continuación, dpendiendo del estado transmitido al método, crearemos el nuevo objeto de solicitud pendiente que le corresponda.
Si el objeto se crea con éxito, en el diario se mostrará un mensaje con los parámetros de la solicitud comercial pendiente creada.

Dado que ahora tenemos un nuevo objeto de clase de solicitud pendiente, deberemos sustituir en el listado de la clase comercial todas las entradas de la clase CPendingReq anterior por CPendRequest. Podremos hacerlo cómodamente usando la búsqueda con sustitución Ctrl+H.

Al crear los nuevos objetos de solicitudes pendientes, les transmitiremos un poco más de información sobre la operación comercial realizada. Básicamente, necesitamos esto para que se muestre correctamente en el diario. Para transmitir dicha información, escribiremos los datos adicionales en la estructura de la solicitud comercial al crear el nuevo objeto de solicitud pendiente.

Indicamos el estado de la solicitud creada en el bloque de creación de una solicitud pendiente del método de apertura de posición:

      //--- If the check result is "waiting" - set the last error code to the return structure and display the message in the journal,
      //--- create a pending request and return 'false'
      if(method>ERROR_CODE_PROCESSING_METHOD_REFRESH)
        {
         //--- If the trading request magic number, has no pending request ID
         if(this.GetPendReqID((uint)magic)==0)
           {
            //--- Play the error sound
            if(this.IsUseSounds())
               trade_obj.PlaySoundError(action,order_type);
            //--- set the last error code to the return structure
            int code=this.m_list_errors.At(this.m_list_errors.Total()-1);
            if(code!=NULL)
              {
               if(code==MSG_LIB_TEXT_TERMINAL_NOT_TRADE_ENABLED || code==MSG_LIB_TEXT_EA_NOT_TRADE_ENABLED)
                  code=10027;
               trade_obj.SetResultRetcode(code);
               trade_obj.SetResultComment(CMessage::Text(trade_obj.GetResultRetcode()));
              }
            //--- Waiting time in milliseconds:
            //--- for the "Wait and repeat" handling method, the waiting value corresponds to the 'method' value,
            ulong wait=method;
            //--- Look for the least of the possible IDs. If failed to find
            //--- or in case of an error while updating the current symbol data, return 'false'
            int id=this.GetFreeID();
            if(id<1 || !symbol_obj.RefreshRates())
               return false;
            //--- Write the pending request object ID to the magic number and fill in the remaining unfilled fields of the trading request structure
            uint mn=(magic==ULONG_MAX ? (uint)trade_obj.GetMagic() : (uint)magic);
            this.SetPendReqID((uchar)id,mn);
            this.m_request.magic=mn;
            this.m_request.action=TRADE_ACTION_DEAL;
            this.m_request.symbol=symbol_obj.Name();
            this.m_request.type=order_type;
            //--- Set the number of trading attempts and create a pending request
            uchar attempts=(this.m_total_try < 1 ? 1 : this.m_total_try);
            this.CreatePendingRequest(PEND_REQ_STATUS_OPEN,(uchar)id,attempts,wait,this.m_request,trade_obj.GetResultRetcode(),symbol_obj);
           }
         return false;
        }

En el método de modificación de órdenes stop de una posición abierta, en el bloque de creación de una solicitud pendiente,
añadimos la transmisión (a través de una estructura) del tipo de orden y el volumen de la posición, e indicamos el estado de la solicitud creada:

      //--- If the check result is "waiting" - set the last error code to the return structure and display the message in the journal,
      //--- create a pending request and return 'false'
      if(method>ERROR_CODE_PROCESSING_METHOD_REFRESH)
        {
         //--- If the pending request object with the position ticket is not present in the list
         if(this.GetIndexPendingRequestByPosition(ticket)==WRONG_VALUE)
           {
            //--- Play the error sound
            if(this.IsUseSounds())
               trade_obj.PlaySoundError(action,order_type,(sl<0 ? false : true),(tp<0 ? false : true));
            //--- set the last error code to the return structure
            int code=this.m_list_errors.At(this.m_list_errors.Total()-1);
            if(code!=NULL)
              {
               if(code==MSG_LIB_TEXT_TERMINAL_NOT_TRADE_ENABLED || code==MSG_LIB_TEXT_EA_NOT_TRADE_ENABLED)
                  code=10027;
               trade_obj.SetResultRetcode(code);
               trade_obj.SetResultComment(CMessage::Text(trade_obj.GetResultRetcode()));
              }
            //--- Waiting time in milliseconds:
            //--- for the "Wait and repeat" handling method, the waiting value corresponds to the 'method' value,
            //--- for the "Create a pending request" handling method - till there is a zero waiting time
            ulong wait=method;
            //--- Look for the least of the possible IDs. If failed to find
            //--- or in case of an error while updating the current symbol data, return 'false'
            int id=this.GetFreeID();
            if(id<1 || !symbol_obj.RefreshRates())
               return false;
            //--- Write a type of a conducted operation, as well as a symbol and a ticket of a modified position to the request structure
            this.m_request.action=TRADE_ACTION_SLTP;
            this.m_request.symbol=symbol_obj.Name();
            this.m_request.position=ticket;
            this.m_request.type=order_type;
            this.m_request.volume=order.Volume();
            //--- Set the number of trading attempts and create a pending request
            uchar attempts=(this.m_total_try < 1 ? 1 : this.m_total_try);
            this.CreatePendingRequest(PEND_REQ_STATUS_SLTP,(uchar)id,attempts,wait,this.m_request,trade_obj.GetResultRetcode(),symbol_obj);
           }
         return false;
        }

En el método de cierre de posición, en su lógica de creación de una solicitud pendiente
añadimos la transmisión (a través de una estructura al objeto de solicitud) del tipo de orden y el volumen de la posición, e indicamos el estado de la solicitud creada:

      //--- If the check result is "waiting" - set the last error code to the return structure and display the message in the journal,
      //--- create a pending request and return 'false'
      if(method>ERROR_CODE_PROCESSING_METHOD_REFRESH)
        {
         //--- If the pending request object with the position ticket is not present in the list
         if(this.GetIndexPendingRequestByPosition(ticket)==WRONG_VALUE)
           {
            //--- Play the error sound
            if(this.IsUseSounds())
               trade_obj.PlaySoundError(action,order_type);
            //--- set the last error code to the return structure
            int code=this.m_list_errors.At(this.m_list_errors.Total()-1);
            if(code!=NULL)
              {
               if(code==MSG_LIB_TEXT_TERMINAL_NOT_TRADE_ENABLED || code==MSG_LIB_TEXT_EA_NOT_TRADE_ENABLED)
                  code=10027;
               trade_obj.SetResultRetcode(code);
               trade_obj.SetResultComment(CMessage::Text(trade_obj.GetResultRetcode()));
              }
            //--- Waiting time in milliseconds:
            //--- for the "Wait and repeat" handling method, the waiting value corresponds to the 'method' value,
            ulong wait=method;
            //--- Look for the least of the possible IDs. If failed to find
            //--- or in case of an error while updating the current symbol data, return 'false'
            int id=this.GetFreeID();
            if(id<1 || !symbol_obj.RefreshRates())
               return false;
            //--- Write the trading operation type, symbol, ticket and volume to the request structure
            this.m_request.action=TRADE_ACTION_DEAL;
            this.m_request.symbol=symbol_obj.Name();
            this.m_request.position=ticket;
            this.m_request.volume=(volume==WRONG_VALUE || volume>order.Volume() ? order.Volume() : volume);
            this.m_request.type=order_type;
            //--- Set the number of trading attempts and create a pending request
            uchar attempts=(this.m_total_try < 1 ? 1 : this.m_total_try);
            this.CreatePendingRequest(PEND_REQ_STATUS_CLOSE,(uchar)id,attempts,wait,this.m_request,trade_obj.GetResultRetcode(),symbol_obj);
           }
         return false;

En el método, el volumen de la posición puede indicarse o bien en negativo (-1), lo cual indica el cierre completo de la posición, o bien con un valor, lo cual indica el cierre parcial de la posición. Todo ello se procesa en el objeto comercial básico del símbolo al enviarse la solicitud comercial al servidor.
Aquí, comprobamos de inmediato el valor del volumen transmitido al método, y luego establecemos el volumen necesario en la estructura de la solicitud comercial.

En el método de cierre de posición con otra opuesta, en su bloque de creación de una solicitud pendiente
añadimos la transmisión (a través de una estructura al objeto de solicitud) del tipo de orden y el volumen de la posición, e indicamos el estado de la solicitud creada:

      //--- If the check result is "waiting" - set the last error code to the return structure and display the message in the journal,
      //--- create a pending request and return 'false'
      if(method>ERROR_CODE_PROCESSING_METHOD_REFRESH)
        {
         //--- If the pending request object with the position ticket is not present in the list
         if(this.GetIndexPendingRequestByPosition(ticket)==WRONG_VALUE)
           {
            //--- Play the error sound
            if(this.IsUseSounds())
               trade_obj_pos.PlaySoundError(action,order_type);
            //--- set the last error code to the return structure
            int code=this.m_list_errors.At(this.m_list_errors.Total()-1);
            if(code!=NULL)
              {
               if(code==MSG_LIB_TEXT_TERMINAL_NOT_TRADE_ENABLED || code==MSG_LIB_TEXT_EA_NOT_TRADE_ENABLED)
                  code=10027;
               trade_obj_pos.SetResultRetcode(code);
               trade_obj_pos.SetResultComment(CMessage::Text(trade_obj_pos.GetResultRetcode()));
              }
            //--- Waiting time in milliseconds:
            //--- for the "Wait and repeat" handling method, the waiting value corresponds to the 'method' value,
            ulong wait=method;
            //--- Look for the least of the possible IDs. If failed to find
            //--- or in case of an error while updating the current symbol data, return 'false'
            int id=this.GetFreeID();
            if(id<1 || !symbol_obj.RefreshRates())
               return false;
            //--- Write the trading operation type, symbol and tickets of two positions to the request structure
            this.m_request.action=TRADE_ACTION_CLOSE_BY;
            this.m_request.symbol=symbol_obj.Name();
            this.m_request.position=ticket;
            this.m_request.position_by=ticket_by;
            this.m_request.type=order_type;
            this.m_request.volume=order.Volume();
            //--- Set the number of trading attempts and create a pending request
            uchar attempts=(this.m_total_try < 1 ? 1 : this.m_total_try);
            this.CreatePendingRequest(PEND_REQ_STATUS_CLOSE,(uchar)id,attempts,wait,this.m_request,trade_obj_pos.GetResultRetcode(),symbol_obj);
           }
         return false;
        }

Indicamos el estado de la solicitud creada en el bloque de creación de una solicitud pendiente del método de colocación de una orden pendiente

      //--- If the check result is "waiting" - set the last error code to the return structure and display the message in the journal,
      //--- create a pending request and return 'false'
      if(method>ERROR_CODE_PROCESSING_METHOD_REFRESH)
        {
         //--- If the trading request magic number, has no pending request ID
         if(this.GetPendReqID((uint)magic)==0)
           {
            //--- Play the error sound
            if(this.IsUseSounds())
               trade_obj.PlaySoundError(action,order_type);
            //--- set the last error code to the return structure
            int code=this.m_list_errors.At(this.m_list_errors.Total()-1);
            if(code!=NULL)
              {
               if(code==MSG_LIB_TEXT_TERMINAL_NOT_TRADE_ENABLED || code==MSG_LIB_TEXT_EA_NOT_TRADE_ENABLED)
                  code=10027;
               trade_obj.SetResultRetcode(code);
               trade_obj.SetResultComment(CMessage::Text(trade_obj.GetResultRetcode()));
              }
            //--- Waiting time in milliseconds:
            //--- for the "Wait and repeat" handling method, the waiting value corresponds to the 'method' value,
            //--- for the "Create a pending request" handling method - till there is a zero waiting time
            ulong wait=method;
            //--- Look for the least of the possible IDs. If failed to find
            //--- or in case of an error while updating the current symbol data, return 'false'
            int id=this.GetFreeID();
            if(id<1 || !symbol_obj.RefreshRates())
               return false;
            //--- Write the request ID to the magic number, while a symbol name is set in the request structure,
            //--- trading operation and order types
            uint mn=(magic==ULONG_MAX ? (uint)trade_obj.GetMagic() : (uint)magic);
            this.SetPendReqID((uchar)id,mn);
            this.m_request.magic=mn;
            this.m_request.symbol=symbol_obj.Name();
            this.m_request.action=TRADE_ACTION_PENDING;
            this.m_request.type=order_type;
               //--- Set the number of trading attempts and create a pending request
            uchar attempts=(this.m_total_try < 1 ? 1 : this.m_total_try);
            this.CreatePendingRequest(PEND_REQ_STATUS_PLACE,(uchar)id,attempts,wait,this.m_request,trade_obj.GetResultRetcode(),symbol_obj);
           }
         return false;
        }

En el método de modificación de los parámetros de una orden pendiente, en su bloque de creación de una solicitud pendiente
añadimos la transmisión (a través de una estructura al objeto de solicitud) del tipo de orden e indicamos el estado de la solicitud creada:

      //--- If the check result is "waiting" - set the last error code to the return structure and display the message in the journal,
      //--- create a pending request and return 'false'
      if(method>ERROR_CODE_PROCESSING_METHOD_REFRESH)
        {
         //--- If the pending request object with the order ticket is not present in the list
         if(this.GetIndexPendingRequestByOrder(ticket)==WRONG_VALUE)
           {
            //--- Play the error sound
            if(this.IsUseSounds())
               trade_obj.PlaySoundError(action,order_type,(sl<0 ? false : true),(tp<0 ? false : true),(price>0 || limit>0 ? true : false));
            //--- set the last error code to the return structure
            int code=this.m_list_errors.At(this.m_list_errors.Total()-1);
            if(code!=NULL)
              {
               if(code==MSG_LIB_TEXT_TERMINAL_NOT_TRADE_ENABLED || code==MSG_LIB_TEXT_EA_NOT_TRADE_ENABLED)
                  code=10027;
               trade_obj.SetResultRetcode(code);
               trade_obj.SetResultComment(CMessage::Text(trade_obj.GetResultRetcode()));
              }
            //--- Waiting time in milliseconds:
            //--- for the "Wait and repeat" handling method, the waiting value corresponds to the 'method' value,
            //--- for the "Create a pending request" handling method - till there is a zero waiting time
            ulong wait=method;
            //--- Look for the least of the possible IDs. If failed to find
            //--- or in case of an error while updating the current symbol data, return 'false'
            int id=this.GetFreeID();
            if(id<1 || !symbol_obj.RefreshRates())
               return false;
            //--- Set the trading operation type, as well as modified order's symbol and ticket in the request structure
            this.m_request.action=TRADE_ACTION_MODIFY;
            this.m_request.symbol=symbol_obj.Name();
            this.m_request.order=ticket;
            this.m_request.type=order_type;
            //--- Set the number of trading attempts and create a pending request
            uchar attempts=(this.m_total_try < 1 ? 1 : this.m_total_try);
            this.CreatePendingRequest(PEND_REQ_STATUS_MODIFY,(uchar)id,attempts,wait,this.m_request,trade_obj.GetResultRetcode(),symbol_obj);
           }
         return false;
        }

En el método de eliminación una orden pendiente en su bloque de creación de una solicitud pendiente
añadimos la transmisión (a través de una estructura al objeto de solicitud) del tipo y el volumen de la orden, y su precio de colocación, e indicamos el estado de la solicitud creada:

      //--- If the check result is "waiting" - set the last error code to the return structure and display the message in the journal,
      //--- create a pending request and return 'false'
      if(method>ERROR_CODE_PROCESSING_METHOD_REFRESH)
        {
         //--- If the pending request object with the order ticket is not present in the list
         if(this.GetIndexPendingRequestByOrder(ticket)==WRONG_VALUE)
           {
            //--- Play the error sound
            if(this.IsUseSounds())
               trade_obj.PlaySoundError(action,order_type);
            //--- set the last error code to the return structure
            int code=this.m_list_errors.At(this.m_list_errors.Total()-1);
            if(code!=NULL)
              {
               if(code==MSG_LIB_TEXT_TERMINAL_NOT_TRADE_ENABLED || code==MSG_LIB_TEXT_EA_NOT_TRADE_ENABLED)
                  code=10027;
               trade_obj.SetResultRetcode(code);
               trade_obj.SetResultComment(CMessage::Text(trade_obj.GetResultRetcode()));
              }
            //--- Waiting time in milliseconds:
            //--- for the "Wait and repeat" handling method, the waiting value corresponds to the 'method' value,
            //--- for the "Create a pending request" handling method - till there is a zero waiting time
            ulong wait=method;
            //--- Look for the least of the possible IDs. If failed to find
            //--- or in case of an error while updating the current symbol data, return 'false'
            int id=this.GetFreeID();
            if(id<1 || !symbol_obj.RefreshRates())
               return false;
            //--- Set the trading operation type, as well as deleted order's symbol and ticket in the request structure
            this.m_request.action=TRADE_ACTION_REMOVE;
            this.m_request.symbol=symbol_obj.Name();
            this.m_request.order=ticket;
            this.m_request.type=order_type;
            this.m_request.volume=order.Volume();
            this.m_request.price=order.PriceOpen();
            //--- Set the number of trading attempts and create a pending request
            uchar attempts=(this.m_total_try < 1 ? 1 : this.m_total_try);
            this.CreatePendingRequest(PEND_REQ_STATUS_REMOVE,(uchar)id,attempts,wait,this.m_request,trade_obj.GetResultRetcode(),symbol_obj);
           }
         return false;
        }

Tenemos dos bloque así en cada método comercial. Por eso, debemos introducir estas correcciones en cada uno de ellos.

Indicamos los tipos de clasificación en los métodos para la búsqueda del identificador libre y para el retorno de los índices de los objetos de solicitud:

//+------------------------------------------------------------------+
//| Look for the first free pending request ID                       |
//+------------------------------------------------------------------+
int CTrading::GetFreeID(void)
  {
   int id=WRONG_VALUE;
   CPendRequest *element=new CPendRequest();
   if(element==NULL)
      return 0;
   for(int i=1;i<256;i++)
     {
      element.SetID((uchar)i);
      this.m_list_request.Sort(SORT_BY_PEND_REQ_ID);
      if(this.m_list_request.Search(element)==WRONG_VALUE)
        {
         id=i;
         break;
        }
     }
   delete element;
   return id;
  }
//+------------------------------------------------------------------+
//| Return the request object index in the list by ID                |
//+------------------------------------------------------------------+
int CTrading::GetIndexPendingRequestByID(const uchar id)
  {
   CPendRequest *req=new CPendRequest();
   if(req==NULL)
      return WRONG_VALUE;
   req.SetID(id);
   this.m_list_request.Sort(SORT_BY_PEND_REQ_ID);
   int index=this.m_list_request.Search(req);
   delete req;
   return index;
  }
//+------------------------------------------------------------------+
//| Return the request object index in the list by the order ticket  |
//+------------------------------------------------------------------+
int CTrading::GetIndexPendingRequestByOrder(const ulong ticket)
  {
   CPendRequest *req=new CPendRequest();
   if(req==NULL)
      return WRONG_VALUE;
   req.SetOrder(ticket);
   this.m_list_request.Sort(SORT_BY_PEND_REQ_MQL_REQ_ORDER);
   int index=this.m_list_request.Search(req);
   delete req;
   return index;
  }
//+-------------------------------------------------------------------+
//| Return the request object index in the list by the position ticket|
//+-------------------------------------------------------------------+
int CTrading::GetIndexPendingRequestByPosition(const ulong ticket)
  {
   CPendRequest *req=new CPendRequest();
   if(req==NULL)
      return WRONG_VALUE;
   req.SetPosition(ticket);
   this.m_list_request.Sort(SORT_BY_PEND_REQ_MQL_REQ_POSITION);
   int index=this.m_list_request.Search(req);
   delete req;
   return index;
  }
//+------------------------------------------------------------------+

Para buscar un objeto en la lista según una propiedad indicada con la ayuda del método Searsh() de la clase de matriz dinámica de punteros a los ejemplares de la clase CObject, debemos indicar preliminarmente (usando el método Sort() de la clase básica de matriz dinámica de variables CArray) el tipo de clasificación de la lista en la que se realiza la búsqueda, dado que dicha búsqueda se efectúa solo en matrices clasificadas. Precisamente eso hemos hecho aquí.

Ahora, corregimos en el temporizador de la clase la muestra de los mensajes sobre el intento comercial en el diario.
Sustituimos este código

      //--- Set the attempt number in the request object
      req_obj.SetCurrentAttempt(uchar(req_obj.CurrentAttempt()+1));
      
      //--- Display the number of a trading attempt in the journal

      if(this.m_log_level>LOG_LEVEL_NO_MSG)
         ::Print(CMessage::Text(MSG_LIB_TEXT_REQUEST)+(string)req_obj.GetProperty(PEND_REQ_PROP_ID)+" "+CMessage::Text(MSG_LIB_TEXT_RE_TRY_N)+(string)req_obj.CurrentAttempt());
      
      //--- Depending on the type of action performed in the trading request 
      switch(request.action)
        {

por este otro:

      //--- Set the attempt number in the request object
      req_obj.SetCurrentAttempt(uchar(req_obj.CurrentAttempt()+1));
      
      //--- Display the number of a trading attempt in the journal

      if(this.m_log_level>LOG_LEVEL_NO_MSG)
        {
         ::Print(CMessage::Text(MSG_LIB_TEXT_RE_TRY_N)+(string)req_obj.CurrentAttempt()+":");
         req_obj.PrintShort();
        }
      
      //--- Depending on the type of action performed in the trading request 
      switch(request.action)
        {

Así, obtendremos en el diario un mensaje más informativo sobre el objeto concreto de solicitud pendiente para el que se realiza el próximo intento comercial.

Estos son todos los cambios necesarios para el trabajo de la biblioteca con los objetos de solicitudes comerciales pendientes.

Simulación

Para realizar la simulación de los nuevos objetos de solicitudes pendientes, tomaremos el asesor del artículo anterior
y lo guardaremos en la nueva carpeta \MQL5\Experts\TestDoEasy\ Part29\ con el nuevo nombre TestDoEasyPart29.mq5.

Los únicos cambios a introducir se darán en los bloques de cierre de media posición Buy y media posición Sell, donde quitaremos la comprobación sobrante. En nuestro caso, todo ello se realiza hace mucho en los métodos comerciales de la clase comercial.

En el bloque de cierre parcial de una posición Buy, en lugar de este código:

      //--- If the BUTT_CLOSE_BUY2 button is pressed: Close the half of the Buy with the maximum profit
      else if(button==EnumToString(BUTT_CLOSE_BUY2))
        {
         //--- Get the list of all open positions
         CArrayObj* list=engine.GetListMarketPosition();
         //--- Select only Buy positions from the list
         list=CSelect::ByOrderProperty(list,ORDER_PROP_TYPE,POSITION_TYPE_BUY,EQUAL);
         //--- Sort the list by profit considering commission and swap
         list.Sort(SORT_BY_ORDER_PROFIT_FULL);
         //--- Get the index of the Buy position with the maximum profit
         int index=CSelect::FindOrderMax(list,ORDER_PROP_PROFIT_FULL);
         if(index>WRONG_VALUE)
           {
            COrder* position=list.At(index);
            if(position!=NULL)
              {
               //--- If this is a hedge account, close the half of the Buy position by the ticket
               if(engine.IsHedge())
                  engine.ClosePositionPartially((ulong)position.Ticket(),position.Volume()/2.0);
               //--- If this is a netting account, open a Sell position with the half of the Buy position volume
               else
                  engine.OpenSell(NormalizeLot(position.Symbol(),position.Volume()/2.0),position.Symbol(),position.Magic(),position.StopLoss(),position.TakeProfit(),"Частичное закрытие Buy #"+(string)position.Ticket());
              }
           }
        }

escribiremos este:

      //--- If the BUTT_CLOSE_BUY2 button is pressed: Close the half of the Buy with the maximum profit
      else if(button==EnumToString(BUTT_CLOSE_BUY2))
        {
         //--- Get the list of all open positions
         CArrayObj* list=engine.GetListMarketPosition();
         //--- Select only Buy positions from the list
         list=CSelect::ByOrderProperty(list,ORDER_PROP_TYPE,POSITION_TYPE_BUY,EQUAL);
         //--- Sort the list by profit considering commission and swap
         list.Sort(SORT_BY_ORDER_PROFIT_FULL);
         //--- Get the index of the Buy position with the maximum profit
         int index=CSelect::FindOrderMax(list,ORDER_PROP_PROFIT_FULL);
         if(index>WRONG_VALUE)
           {
            COrder* position=list.At(index);
            //--- Close the Buy position partially
            if(position!=NULL)
               engine.ClosePositionPartially((ulong)position.Ticket(),position.Volume()/2.0);
           }
        }

Reescribiremos exactamente de la misma forma el cierre parcial de una posición Sell:

      //--- If the BUTT_CLOSE_SELL2 button is pressed: Close the half of the Sell with the maximum profit
      else if(button==EnumToString(BUTT_CLOSE_SELL2))
        {
         //--- Get the list of all open positions
         CArrayObj* list=engine.GetListMarketPosition();
         //--- Select only Sell positions from the list
         list=CSelect::ByOrderProperty(list,ORDER_PROP_TYPE,POSITION_TYPE_SELL,EQUAL);
         //--- Sort the list by profit considering commission and swap
         list.Sort(SORT_BY_ORDER_PROFIT_FULL);
         //--- Get the index of the Sell position with the maximum profit
         int index=CSelect::FindOrderMax(list,ORDER_PROP_PROFIT_FULL);
         if(index>WRONG_VALUE)
           {
            COrder* position=list.At(index);
            //--- Close the Sell position partially
            if(position!=NULL)
               engine.ClosePositionPartially((ulong)position.Ticket(),position.Volume()/2.0);
           }
        }

Compilamos e iniciamos el asesor.

En este momento, tenemos colocadas cuatro órdenes pendientes. Desactivamos el botón "Trading automático" y pulsamos el botón "Delete pending" del asesor de prueba, para eliminar todas las órdenes pendientes. En el diario se muestran los siguientes mensajes:

2019.12.19 04:25:04.385 CTrading::DeleteOrder: Invalid request:
2019.12.19 04:25:04.385 There is no permission to conduct trading operations in the terminal (the "AutoTrading" button is disabled)
2019.12.19 04:25:04.385 Correction of trade request parameters ...
2019.12.19 04:25:04.385 Pending request created #1:
2019.12.19 04:25:04.385 Pending request to remove a pending order: 
2019.12.19 04:25:04.385 - EURUSD 0.10 Pending order Buy Limit #497568391, Price 1.11076
2019.12.19 04:25:04.385 - Pending request ID: #1, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:04.385 
2019.12.19 04:25:04.386 CTrading::DeleteOrder: Invalid request:
2019.12.19 04:25:04.386 There is no permission to conduct trading operations in the terminal (the "AutoTrading" button is disabled)
2019.12.19 04:25:04.386 Correction of trade request parameters ...
2019.12.19 04:25:04.386 Pending request created #2:
2019.12.19 04:25:04.386 Pending request to remove a pending order: 
2019.12.19 04:25:04.386 - EURUSD 0.10 Pending order Buy Limit #497563913, Price 1.11099
2019.12.19 04:25:04.386 - Pending request ID: #2, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:04.386 
2019.12.19 04:25:04.386 CTrading::DeleteOrder: Invalid request:
2019.12.19 04:25:04.386 There is no permission to conduct trading operations in the terminal (the "AutoTrading" button is disabled)
2019.12.19 04:25:04.386 Correction of trade request parameters ...
2019.12.19 04:25:04.386 Pending request created #3:
2019.12.19 04:25:04.386 Pending request to remove a pending order: 
2019.12.19 04:25:04.386 - EURUSD 0.10 Pending order Sell Limit #496816788, Price 1.11829
2019.12.19 04:25:04.386 - Pending request ID: #3, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:04.386 
2019.12.19 04:25:04.386 CTrading::DeleteOrder: Invalid request:
2019.12.19 04:25:04.386 There is no permission to conduct trading operations in the terminal (the "AutoTrading" button is disabled)
2019.12.19 04:25:04.386 Correction of trade request parameters ...
2019.12.19 04:25:04.387 Pending request created #4:
2019.12.19 04:25:04.387 Pending request to remove a pending order: 
2019.12.19 04:25:04.387 - EURUSD 0.10 Pending order Sell Limit #496816707, Price 1.11784
2019.12.19 04:25:04.387 - Pending request ID: #4, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:04.387

Aquí podemos ver que el asesor ha intentado cuatro veces eliminar cuatro órdenes pendientes, y que, al detectar el error de prohibición de comercio en el lado del terminal, ha creado cuatro solicitudes pendientes, sobre las que ha mostrado a continuación cuatro mensajes con sus parámetros.

Acto seguido, no hacemos nada: simplemente esperamos.
Transcurrido cierto tiempo (20 segundos de espera, pero depende de la llegada de los ticks), en el diario se muestran varios mensajes de los objetos de solicitudes pendientes sobre los nuevos intentos de eliminar las cuatro órdenes:

2019.12.19 04:25:38.780 Retry trading attempt #1:
2019.12.19 04:25:38.780 Pending request to remove a pending order: 
2019.12.19 04:25:38.780 - EURUSD 0.10 Pending order Sell Limit #496816707, Price 1.11784
2019.12.19 04:25:38.780 - Pending request ID: #4, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:38.780 
2019.12.19 04:25:38.780 Retry trading attempt #1:
2019.12.19 04:25:38.780 Pending request to remove a pending order: 
2019.12.19 04:25:38.780 - EURUSD 0.10 Pending order Buy Limit #497563913, Price 1.11099
2019.12.19 04:25:38.780 - Pending request ID: #2, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:38.780 
2019.12.19 04:25:38.781 Retry trading attempt #1:
2019.12.19 04:25:38.781 Pending request to remove a pending order: 
2019.12.19 04:25:38.781 - EURUSD 0.10 Pending order Sell Limit #496816788, Price 1.11829
2019.12.19 04:25:38.781 - Pending request ID: #3, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:38.781 
2019.12.19 04:25:39.103 Retry trading attempt #1:
2019.12.19 04:25:39.103 Pending request to remove a pending order: 
2019.12.19 04:25:39.103 - EURUSD 0.10 Pending order Buy Limit #497568391, Price 1.11076
2019.12.19 04:25:39.103 - Pending request ID: #1, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:39.103 
2019.12.19 04:25:42.006 Retry trading attempt #2:
2019.12.19 04:25:42.006 Pending request to remove a pending order: 
2019.12.19 04:25:42.006 - EURUSD 0.10 Pending order Buy Limit #497568391, Price 1.11076
2019.12.19 04:25:42.006 - Pending request ID: #1, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:42.006 
2019.12.19 04:25:42.007 Retry trading attempt #2:
2019.12.19 04:25:42.007 Pending request to remove a pending order: 
2019.12.19 04:25:42.007 - EURUSD 0.10 Pending order Buy Limit #497563913, Price 1.11099
2019.12.19 04:25:42.007 - Pending request ID: #2, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:42.007 
2019.12.19 04:25:42.007 Retry trading attempt #2:
2019.12.19 04:25:42.007 Pending request to remove a pending order: 
2019.12.19 04:25:42.007 - EURUSD 0.10 Pending order Sell Limit #496816788, Price 1.11829
2019.12.19 04:25:42.007 - Pending request ID: #3, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:42.007 
2019.12.19 04:25:42.008 Retry trading attempt #2:
2019.12.19 04:25:42.008 Pending request to remove a pending order: 
2019.12.19 04:25:42.008 - EURUSD 0.10 Pending order Sell Limit #496816707, Price 1.11784
2019.12.19 04:25:42.008 - Pending request ID: #4, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:25:42.008 
2019.12.19 04:26:03.026 Retry trading attempt #3:
2019.12.19 04:26:03.026 Pending request to remove a pending order: 
2019.12.19 04:26:03.026 - EURUSD 0.10 Pending order Buy Limit #497568391, Price 1.11076
2019.12.19 04:26:03.026 - Pending request ID: #1, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:26:03.026 
2019.12.19 04:26:03.027 Retry trading attempt #3:
2019.12.19 04:26:03.027 Pending request to remove a pending order: 
2019.12.19 04:26:03.027 - EURUSD 0.10 Pending order Buy Limit #497563913, Price 1.11099
2019.12.19 04:26:03.027 - Pending request ID: #2, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:26:03.027 
2019.12.19 04:26:03.027 Retry trading attempt #3:
2019.12.19 04:26:03.028 Pending request to remove a pending order: 
2019.12.19 04:26:03.028 - EURUSD 0.10 Pending order Sell Limit #496816788, Price 1.11829
2019.12.19 04:26:03.028 - Pending request ID: #3, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:26:03.028 
2019.12.19 04:26:03.028 Retry trading attempt #3:
2019.12.19 04:26:03.028 Pending request to remove a pending order: 
2019.12.19 04:26:03.028 - EURUSD 0.10 Pending order Sell Limit #496816707, Price 1.11784
2019.12.19 04:26:03.028 - Pending request ID: #4, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:26:03.028 
2019.12.19 04:26:22.357 Retry trading attempt #4:
2019.12.19 04:26:22.357 Pending request to remove a pending order: 
2019.12.19 04:26:22.357 - EURUSD 0.10 Pending order Buy Limit #497568391, Price 1.11076
2019.12.19 04:26:22.357 - Pending request ID: #1, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:26:22.357 
2019.12.19 04:26:22.358 Retry trading attempt #4:
2019.12.19 04:26:22.358 Pending request to remove a pending order: 
2019.12.19 04:26:22.358 - EURUSD 0.10 Pending order Buy Limit #497563913, Price 1.11099
2019.12.19 04:26:22.358 - Pending request ID: #2, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:26:22.358 
2019.12.19 04:26:22.358 Retry trading attempt #4:
2019.12.19 04:26:22.358 Pending request to remove a pending order: 
2019.12.19 04:26:22.358 - EURUSD 0.10 Pending order Sell Limit #496816788, Price 1.11829
2019.12.19 04:26:22.358 - Pending request ID: #3, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920
2019.12.19 04:26:22.358 
2019.12.19 04:26:22.359 Retry trading attempt #4:
2019.12.19 04:26:22.359 Pending request to remove a pending order: 
2019.12.19 04:26:22.359 - EURUSD 0.10 Pending order Sell Limit #496816707, Price 1.11784
2019.12.19 04:26:22.359 - Pending request ID: #4, Created 2019.12.18 23:25:01.920, Attempts 5, Wait 00:00:20, End 2019.12.18 23:26:41.920

Y, una vez más, esperamos la ejecución del siguiente intento comercial. Llegado un momento determinado, los objetos de solicitudes pendientes son eliminados, debido a la expiración del tiempo reservado a todos los intentos comerciales:

2019.12.19 04:26:44.004 Pending request ID: #1: Deleted due to expiration
2019.12.19 04:26:44.004 Pending request ID: #2: Deleted due to expiration
2019.12.19 04:26:44.004 Pending request ID: #3: Deleted due to expiration
2019.12.19 04:26:44.004 Pending request ID: #4: Deleted due to expiration

Si durante el tiempo reservado a todos los intentos comerciales hubiese estado pulsado el botón "Trading automático", los objetos de solicitudes pendientes habrían enviado al servidor una orden sobre la eliminación de las órdenes pendientes, y estas habrían sido eliminadas.

Exactamente de la misma forma hemos comprobado el funcionamiento de los objetos de solicitudes comerciales pendientes de apertura/cierre de posiciones, de colocación de órdenes, de modificación de órdenes stop de las posiciones y de modificación de los parámetros de las órdenes pendientes de cierre de una posición con otra opuesta. Y esto es lo que hemos visto: las solicitudes comerciales pendientes funcionan correctamente en la mayoría de los casos. Pero hay un "pero": si, por ejemplo, modificamos primero una orden pendiente, y después intentamos de nuevo realizar cualquier modificación en ella, no lo conseguiremos. Básicamente, es como realizar dos o más operaciones comerciales con el mismo ticket. Las solicitudes pendientes simplemente se eliminarán justo después de ser creadas, con el motivo "Ejecutado". La cuestión es que, en los artículos anteriores, las comprobaciones del procesamiento de las solicitudes pendientes se realizaban solo según el ticket en el temporizador de la clase comercial. Y el método de comprobación, al encontrar en la historia de la cuenta que una operación con un cierto ticket acababa de ser comprobada, consideraba que todo había sido procesado, y que merecía la pena eliminar este objeto de solicitud. Coregiremos esta situación más tarde.

Por favor, tenga en cuenta:

¡Insistimos en que el trabajo con la clase de los objetos de solicitudes pendientes no ha sido finalizado, y que, por consiguiente, tanto los resultados descritos en el presente artículo, como el asesor de prueba no se deben utilizar en ningún caso en proyectos propios para el comercio real!
Este artículo, así como sus materiales y resultados en la fase actual, no suponen de forma alguna un producto definitivo a usar en cuentas reales, sino exclusivamente en el modo demo o el simulador.

¿Qué es lo próximo?

En el próximo artículo, crearemos una clase para gestionar las solicitudes comerciales pendientes, ahorrándonos la necesidad de realizar varias veces seguidas la misma operación comercial con una misma orden o posición.

Más abajo se adjuntan todos los archivos de la versión actual de la biblioteca y los archivos del asesor de prueba. Puede descargarlo todo y ponerlo a prueba por sí mismo.
Si tiene preguntas, observaciones o sugerencias, podrá concretarlas en los comentarios al artículo.

Volver al contenido

Artículos de esta serie:

Parte 1: Concepto y organización de datos
Parte 2: Colecciones de las órdenes y transacciones históricas
Parte 3: Colección de órdenes y posiciones de mercado, organización de la búsqueda
Parte 4: Eventos comerciales. Concepto
Parte 5: Clases y colección de eventos comerciales. Envío de eventos al programa.
Parte 6. Eventos en la cuenta con compensación
Parte 7. Eventos de activación de órdenes StopLimit, preparación de la funcionalidad para el registro de los eventos de modificación de órdenes y posiciones
Parte 8. Eventos de modificación de órdenes y posiciones
Parte 9. Compatibilidad con MQL4 - Preparando los datos
Parte 10. Compatibilidad con MQL4 - Eventos de apertura de posición y activación de órdenes pendientes
Parte 11. Compatibilidad con MQL4 - Eventos de cierre de posiciones
Parte 12. Implementando la clase de objeto "cuenta" y la colección de objetos de cuenta
Parte 13. Eventos del objeto "cuenta"
Parte 14. El objeto "Símbolo"
Parte 15. Colección de objetos de símbolo
Parte 16. Eventos de la colección de símbolos
Parte 17. Interactividad de los objetos de la biblioteca
Parte 18. Interactividad del objeto de cuenta y cualquier otro objeto de la biblioteca
Parte 19. Clase de mensajes de la biblioteca
Parte 20. Creación y guardado de los recursos del programa
Parte 21. Clases comerciales - El objeto comercial multiplataforma básico
Parte 22. Clases comerciales - Clase comercial principal, control de limitaciones
Parte 23. Clase comercial principal - Control de parámetros permitidos
Parte 24. Clase comercial principal - corrección automática de parámetros erróneos
Parte 25. Procesando los errores retornados por el servidor comercial
Parte 26. Trabajando con las solicitudes comerciales pendientes - primera implementación (apertura de posiciones)
Parte 27. Trabajando con las solicitudes comerciales pendientes - Colocación de órdenes pendientes
Parte 28. Trabajando con las solicitudes comerciales pendientes - Cierre, eliminación y modificación

Traducción del ruso hecha por MetaQuotes Ltd.
Artículo original: https://www.mql5.com/ru/articles/7454

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