MQL5 per Principianti Guida all'Utilizzo degli Indicatori Tecnici negli Expert Advisor
MetaTrader 5
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Indicatori
| 8 dicembre 2021, 17:10
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Introduzione
Un Expert Advisor o un indicatore che non utilizza indicatori tecnici standard nel suo codice è raro. Sono popolari sia per i principianti che per gli sviluppatori esperti di strategie di trading. Non è difficile capire i dettagli per creare degli indicatori; lo scopo di questo articolo è quello di aiutare in questa operazione. Analizzeremo l'uso delle funzioni per lavorare con indicatori tecnicistandard integrati.
Fondamenti dell'Utilizzo delle Funzioni degli Indicatori Tecnici Standard
Quando viene chiamata, ogni funzione di un indicatore tecnico crea un handle dell'oggetto creato (istanza dell'indicatore) con parametri di input specificati. Lo scopo dell'handle è assegnargli questo oggetto. È sufficiente ottenere i dati dal buffer dell'indicatore e utilizzarli nei propri calcoli. Consideriamo un esempio:
double MA[]; // array for the indicator iMA int MA_handle; // handle of the indicator iMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iMA MA_handle=iMA(NULL,0,21,0,MODE_EMA,PRICE_CLOSE); return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array MA[] with current values of iMA //--- Copying 100 elements CopyBuffer(MA_handle,0,0,100,MA); //--- set indexing of elements as series, as in MQL4 ArraySetAsSeries(MA,true); //--- here you can use the data of MA[] as you wish, for example: if(MA[0]>MA[1]) { //--- some operations } }
Come vediamo, tutto è abbastanza semplice. Questo esempio mostra come utilizzare l'indicatore iMA - il più popolare tra i trader.
L’handle dell'indicatore deve essere creato all'interno della funzione OnInit()
- "Imposta l'indicizzazione degli elementi come serie, come in MQL4"- cosa significa? Nel nostro esempio abbiamo usato gli elementi di indicizzazione come timeseries. In altre parole, la barra corrente (che non si è ancora formata) ha sempre indice [0], la precedente (già formata) ha indice [1], ecc.
- Perché impostiamo l'indicizzazione? La abbiamo usato per la comodità e l'implementazione ottimale dell'algoritmo. Il linguaggio MQL5 consente di utilizzare la comoda indicizzazione per il programmatore.
- Perché è meglio creare un indicatore all'interno della funzione OnInit()? Naturalmente, può essere creato ovunque nel programma, perché non esiste alcun divieto esplicito. Tuttavia, c'è un forte argomento a favore del modo proposto: la funzione OnInit() viene chiamata una volta all'avvio di un Expert Advisor ed è abbastanza sufficiente per eseguire l'inizializzazione degli indicatori che non cambia i suoi parametri durante l'esecuzione. Nel caso in cui cambino i loro parametri di input, è possibile inizializzarli nuovamente all'interno di un'altra funzione, ad esempio nella funzione OnTick().
Lezioni di programmazione
Quasi tutti gli Expert Advisor sono progettati per eseguire operazioni di trading non solo sulla demo, ma anche su un account reale. Se vuoi dormire sonni tranquilli quando esegue operazioni di trading, dovresti prevedere tutti i possibili risultati del suo trade. Anche gli sviluppatori altamente qualificati di sistemi di trading automatizzati spesso commettono errori fastidiosi. E il prezzo di tale errore può essere molto alto!
Ad esempio, ecco una storia accaduta all'Automated Trading Championship 2008. Un Expert Advisor di uno dei partecipanti dovrebbe aumentare il suo deposito ad un certo livello e dormire. E' stato fatto. L'autore e tutti coloro che stavano guardando il lavoro dell'Expert Advisor sono rimasti sorpresi, quando si è svegliato e ha iniziato a fare di nuovo trading, perdendo i soldi guadagnati.
Naturalmente, tu non vuoi commettere errori simili quando il robot va fuori controllo. Quindi, consideriamo le "barriere coralline" che possono essere catturate durante l'utilizzo degli indicatori tecnici standard:
- Il puntatore dell’oggetto viene creato nel blocco di inizializzazione. E se non ci fosse riuscito? In questo caso, otterremo un riferimento vuoto. Pertanto, usiamo la possibilità di verificarne la validità che è stata fornita dagli sviluppatori MQL5. Se il puntatore non è stato creato, il valore dell’handle, restituito dalla funzione, sarà uguale alla costante standard INVALID_HANDLE = -1.
- Quando otteniamo i dati dall'indicatore, stiamo copiando i suoi valori nel buffer dell'indicatore e li utilizziamo nei nostri calcoli. Cosa succede se non ci è riuscito? Se la copia non è riuscita, un sistema di trading può generare segnali di trading errati. Per questi casi, gli sviluppatori di MQL5 hanno fornito la possibilità di controllare immediatamente il numero di elementi copiati. Il numero di elementi copiati in caso di errore sarà pari a -1.
Ora consideriamo come può essere codificato:
//---- arrays for indicators double MA[]; // array for the indicator iMA //---- handles for indicators int MA_handle; // handle of the indicator iMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iMA MA_handle=iMA(NULL,0,21,0,MODE_EMA,PRICE_CLOSE); //--- report if there was an error in object creation if(MA_handle<0) { Print("The creation of iMA has failed: MA_handle=",INVALID_HANDLE); Print("Runtime error = ",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array MA[] with current values of iMA //--- 100 elements should be written to the array //--- if there was an error, we terminate the execution of program if(CopyBuffer(MA_handle,0,0,100,MA)<=0) return; //--- set indexation of array MA[] as timeseries ArraySetAsSeries(MA,true); //--- here you can use the data of MA[] as you wish if(MA[0]>MA[1]) { //--- some operations } }
Si noti che solo un piccolo cambiamento nel codice ha aumentato la sua sicurezza e affidabilità. Ma non è tutto. Ora la procedura di copia dei valori dell'indicatore nell'array può essere migliorata. È necessario utilizzare la funzione che è stata scritta:
//+------------------------------------------------------------------------------+ //| The function copies the values of the indicator,the elements | //| will be indexed depending on the value of the input parameter asSeries | //+------------------------------------------------------------------------------+ bool CopyBufferAsSeries( int handle, // indicator's handle int bufer, // buffer index int start, // start index int number, // number of elements to copy bool asSeries, // if it's true, the elements will be indexed as series double &M[] // target array ) { //--- filling the array M with current values of the indicator if(CopyBuffer(handle,bufer,start,number,M)<=0) return(false); //--- the elements will be indexed as follows: //--- if asSeries=true, it will be indexed as timeseries //--- if asSeries=false, it will be indexed as default ArraySetAsSeries(M,asSeries); //--- return(true); }
La funzione CopyBufferAsSeries si trova nel file GetIndicatorBuffers.mqh, allegato all'articolo. Per il suo utilizzo, dobbiamo aggiungere la direttiva include nel nostro codice. E' necessario copiarlo nella cartella.. \ MQL5\Include\. Il codice finale che chiama l'indicatore iMA e copia i dati dal buffer dell'indicatore nell’array corrispondente è il seguente:
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double MA[]; // array for the indicator iMA //---- handles for indicators int MA_handle; // handle for the indicator iMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iMA MA_handle=iMA(NULL,0,21,0,MODE_EMA,PRICE_CLOSE); //--- report if there was an error in object creation if(MA_handle<0) { Print("The creation of iMA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array MA[] with current values of iMA //--- set indexation of array MA[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(MA_handle,0,0,100,true,MA)) return; //--- here you can use the data of MA[] as you wish, for example: if(MA[0]>MA[1]) { //--- some operations } }
Caratteristiche degli Indicatori Multi-Buffer
Ad esempio, consideriamo l'indicatore iAlligator, che ha 3 buffer indicatori:
- 0 buffer - GATORJAW_LINE
- 1° buffer - GATORTEETH_LINE
- 2° buffer - GATORLIPS_LINE
Per eseguire i dati ricevuti dai buffer di questi indicatori utilizzando una chiamata, utilizzeremo la seguente funzione, che può essere trovata nel file, inclusa nell'articolo
//+------------------------------------------------------------------------------+ //| The function copies the values of the indicator Alligator to three arrays: | //| Jaws[], Teeth[], Lips[] (with elements indexed as timeaseries). | //+------------------------------------------------------------------------------+ bool GetAlligatorBuffers(int Alligator_handle, int start, int number, double &Jaws[], double &Teeth[], double &Lips[], bool asSeries=true // (elements indexed as timeaseries) ) { //--- filling an array Jaws with current values of GATORJAW_LINE if(!CopyBufferAsSeries(Alligator_handle,0,start,number,asSeries,Jaws)) return(false); //--- filling an array Teeth with current values of GATORTEETH_LINE if(!CopyBufferAsSeries(Alligator_handle,1,start,number,asSeries,Teeth)) return(false); //--- filling an array Lisp with current values of GATORLIPS_LINE if(!CopyBufferAsSeries(Alligator_handle,2,start,number,asSeries,Lips)) return(false); //--- return(true); }
che può essere utilizzato come segue:
#include <GetIndicatorBuffers.mqh> //---- indicator buffers double Jaws[]; // array for GATORJAW_LINE of iAlligator double Teeth[]; // array for GATORTEETH_LINE of iAlligator double Lips[]; // array for GATORLIPS_LINE of iAlligator //---- handles for indicators int Alligator_handle; // handle of the indicator iAlligator //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iAlligator Alligator_handle=iAlligator(NULL,0,13,8,8,5,5,3,MODE_EMA,PRICE_MEDIAN); //--- report if there was an error in object creation if(Alligator_handle<0) { Print("The creation of iAlligator has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- fill arrays with current values of Alligator //--- return if there was an error if(!GetAlligatorBuffers(Alligator_handle,0,100,Jaws,Teeth,Lips,true)) return; }
Quindi, abbiamo delineato i punti chiave, ora siamo pronti a considerare gli esempi per tutti gli indicatori standard.
Esempi di Utilizzo di Indicatori Standard
iAC
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double AC[]; // array for the indicator iAC //---- handles for indicators int AC_handle; // handle of the indicator iAC //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iAC AC_handle=iAC(NULL,0); //--- report if there was an error in object creation if(AC_handle<0) { Print("The creation of iAC has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array AC[] with current values of iAC //--- set indexation of array AC[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(AC_handle,0,0,100,true,AC)) return; }
iAD
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double AD[]; // array for the indicator iAD //---- handles for indicators int AD_handle; // handle for the indicator iAD //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iAD AD_handle=iAD(NULL,0,VOLUME_TICK); //--- report if there was an error in object creation if(AD_handle<0) { Print("The creation of iAD has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array AD[] with current values of iAD //--- set indexation of array AD[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(AD_handle,0,0,100,true,AD)) return; }
iADX
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Main[]; // array for MAIN_LINE of iADX double PlusDI[]; // array for PLUSDI_LINE of iADX double MinusDI[]; // array for MINUSDI_LINE of iADX //---- handles for indicators int ADX_handle; // handle of the indicator iADX //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iADX ADX_handle=iADX(NULL,0,14); //--- report if there was an error in object creation if(ADX_handle<0) { Print("The creation of iADX has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetADXBuffers(ADX_handle,0,100,Main,PlusDI,MinusDI,true)) return; }
iADXWilder
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Main[]; // array for MAIN_LINE of iADXWilder double PlusDI[]; // array for PLUSDI_LINE of iADXWilder double MinusDI[]; // array for MINUSDI_LINE of iADXWilder //---- handles for indicators int ADXWilder_handle; // handle of the indicator iADXWilder //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iADXWilder ADXWilder_handle=iADXWilder(NULL,0,14); //--- report if there was an error in object creation if(ADXWilder_handle<0) { Print("The creation of iADXWilder has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetADXWilderBuffers(ADXWilder_handle,0,100,Main,PlusDI,MinusDI,true)) return; }
iAlligator
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Jaws[]; // array for GATORJAW_LINE of iAlligator double Teeth[]; // array for GATORTEETH_LINE of iAlligator double Lips[]; // array for GATORLIPS_LINE of iAlligator //---- handles for indicators int Alligator_handle; // handle of the indicator iAlligator //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iAlligator Alligator_handle=iAlligator(NULL,0,13,8,8,5,5,3,MODE_EMA,PRICE_MEDIAN); //--- report if there was an error in object creation if(Alligator_handle<0) { Print("The creation of iAlligator has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetAlligatorBuffers(Alligator_handle,0,100,Jaws,Teeth,Lips,true)) return; }
iAMA
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double AMA[]; // array for the indicator iAMA //---- handles for indicators int AMA_handle; // handle for the indicator iAMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iAMA AMA_handle=iAMA(NULL,0,21,5,8,0,PRICE_CLOSE); //--- report if there was an error in object creation if(AMA_handle<0) { Print("The creation of iAMA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array AMA[] with current values of iAMA //--- set indexation of array AMA[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(AMA_handle,0,0,100,true,AMA)) return; }
iAO
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double AO[]; // array for the indicator iAO //---- handles for indicators int AO_handle; // handle of the indicator iAO //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iAO AO_handle=iAO(NULL,0); //--- report if there was an error in object creation if(AO_handle<0) { Print("The creation of iAO has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array AO[] with current values of iAO //--- set indexation of array AO[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(AO_handle,0,0,100,true,AO)) return; }
iATR
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double ATR[]; // array for the indicator iATR //---- handles for indicators int ATR_handle; // handle of the indicator iATR //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iATR ATR_handle=iATR(NULL,0,14); //--- report if there was an error in object creation if(ATR_handle<0) { Print("The creation of iATR has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array ATR[] with current values of iATR //--- set indexation of array ATR[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(ATR_handle,0,0,100,true,ATR)) return; }
iBearsPower
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double BearsPower[]; // array for the indicator iBearsPower //---- handles for indicators int BearsPower_handle; // handle for the indicator iBearsPower //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iBearsPower BearsPower_handle=iBearsPower(NULL,0,14); //--- report if there was an error in object creation if(BearsPower_handle<0) { Print("The creation of iBearsPower has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array BearsPower[] with current values of iBearsPower //--- set indexation of array BearsPower[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(BearsPower_handle,0,0,100,true,BearsPower)) return; }
iBands
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Base[]; // array for BASE_LINE of iBands double Upper[]; // array for UPPER_BAND of iBands double Lower[]; // array for LOWER_BAND of iBands //---- handles for indicators int Bands_handle; // handle of the indicator iBands //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iBands Bands_handle=iBands(NULL,0,144,0,2,PRICE_CLOSE); //--- report if there was an error in object creation if(Bands_handle<0) { Print("The creation of iBands has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetBandsBuffers(Bands_handle,0,100,Base,Upper,Lower,true)) return; }
iBullsPower
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double BullsPower[]; // array for the indicator iBullsPower //---- handles for indicators int BullsPower_handle; // handle for the indicatoriBullsPower //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iBullsPower BullsPower_handle=iBullsPower(NULL,0,14); //--- report if there was an error in object creation if(BullsPower_handle<0) { Print("The creation of iBullsPower has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array BullsPower[] with current values of iBullsPower //--- set indexation of array BullsPower[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(BullsPower_handle,0,0,100,true,BullsPower)) return; }
iCCI
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double CCI[]; // array for the indicator iCCI //---- handles for indicators int CCI_handle; // handle for the indicator iCCI //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iCCI CCI_handle=iCCI(NULL,0,14,PRICE_CLOSE); //--- report if there was an error in object creation if(CCI_handle<0) { Print("The creation of iCCI has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array CCI[] with current values of iCCI //--- set indexation of array CCI[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(CCI_handle,0,0,100,true,CCI)) return; }
iChaikin
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Chaikin[]; // array for the indicator iChaikin //---- handles for indicators int Chaikin_handle; // handle for the indicator iChaikin //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iChaikin Chaikin_handle=iChaikin(NULL,0,8,14,MODE_EMA,VOLUME_TICK); //--- report if there was an error in object creation if(Chaikin_handle<0) { Print("The creation of iChaikin has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array Chaikin[] with current values of iChaikin //--- set indexation of array AC[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(Chaikin_handle,0,0,100,true,Chaikin)) return; }
iDEMA
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double DEMA[]; // array for the indicator iDEMA //---- handles for indicators int DEMA_handle; // handle for the indicator iDEMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iDEMA DEMA_handle=iDEMA(NULL,0,8,0,PRICE_CLOSE); //--- report if there was an error in object creation if(DEMA_handle<0) { Print("The creation of iDEMA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array DEMA[] with current values of iDEMA //--- set indexation of array DEMA[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(DEMA_handle,0,0,100,true,DEMA)) return; }
iDeMarker
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double DeMarker[]; // array for the indicator iDeMarker //---- handles for indicators int DeMarker_handle; // handle for the indicator iDeMarker //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iDeMarker DeMarker_handle=iDeMarker(NULL,0,21); //--- report if there was an error in object creation if(DeMarker_handle<0) { Print("The creation of iDeMarker has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array DeMarker[] with current values of iDeMarker //--- set indexation of array DeMarker[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(DeMarker_handle,0,0,100,true,DeMarker)) return; }
iEnvelopes
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Upper[]; // array for UPPER_LINE of iEnvelopes double Lower[]; // array for LOWER_LINE of iEnvelopes //---- handles for indicators int Envelopes_handle; // handle of the indicator iEnvelopes //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iEnvelopes Envelopes_handle=iEnvelopes(NULL,0,14,0,MODE_SMA,PRICE_CLOSE,0.1); //--- report if there was an error in object creation if(Envelopes_handle<0) { Print("The creation of iEnvelopes has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation for arrays as timeseries //--- return if there was an error //--- filling the arrays with current values of iEnvelopes if(!GetEnvelopesBuffers(Envelopes_handle,0,100,Upper,Lower,true)) return; }
iForce
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Force[]; // array for the indicator iForce //---- handles for indicators int Force_handle; // handle for the indicator iForce //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iForce Force_handle=iForce(NULL,0,21,MODE_SMA,VOLUME_TICK); //--- report if there was an error in object creation if(Force_handle<0) { Print("The creation of iForce has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array Force[] with current values of iForce //--- set indexation of array Force[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(Force_handle,0,0,100,true,Force)) return; }
iFractals
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Upper[]; // array for UPPER_LINE of iFractals double Lower[]; // array for LOWER_LINE of iFractals //---- handles for indicators int Fractals_handle; // handle of the indicator iFractals //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iFractals Fractals_handle=iFractals(NULL,0); //--- report if there was an error in object creation if(Fractals_handle<0) { Print("The creation of iFractals has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetFractalsBuffers(Fractals_handle,0,100,Upper,Lower,true)) return; }
iFrAMA
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double FrAMA[]; // array for the indicator iFrAMA //---- handles for indicators int FrAMA_handle; // handle for the indicator iFrAMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iFrAMA FrAMA_handle=iFrAMA(NULL,0,21,0,MODE_SMA); //--- report if there was an error in object creation if(FrAMA_handle<0) { Print("The creation of iFrAMA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array FrAMA[] with current values of iFrAMA //--- set indexation of array FrAMA[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(FrAMA_handle,0,0,100,true,FrAMA)) return; }
iGator
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Upper[]; // array for UPPER_LINE of iGator double Lower[]; // array for LOWER_LINE of iGator //---- handles for indicators int Gator_handle; // handle of the indicator iGator //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iGator Gator_handle=iGator(NULL,0,13,8,8,5,5,3,MODE_EMA,PRICE_MEDIAN); //--- report if there was an error in object creation if(Gator_handle<0) { Print("The creation of iGator has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetGatorBuffers(Gator_handle,0,100,Upper,Lower,true)) return; }
iIchimoku
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Tenkansen[]; // array for TENKANSEN_LINE of iIchimoku double Kijunsen[]; // array for KIJUNSEN_LINE of iIchimoku double SenkouspanA[]; // array for SENKOUSPANA_LINE of iIchimoku double SenkouspanB[]; // array for SENKOUSPANB_LINE of iIchimoku double Chinkouspan[]; // array for CHINKOUSPAN_LINE of iIchimoku //---- handles for indicators int Ichimoku_handle; // handle of the indicator iIchimoku //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iIchimoku Ichimoku_handle=iIchimoku(NULL,0,9,26,52); //--- report if there was an error in object creation if(Ichimoku_handle<0) { Print("The creation of iIchimoku has failed: Runtime error =",GetLastError()); //--- forced program terminatio return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetIchimokuBuffers(Ichimoku_handle,0,100, Tenkansen, Kijunsen, SenkouspanA, SenkouspanB, Chinkouspan, true)) return; }
iBWMFI
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double BWMFI[]; // array for the indicator iBWMFI //---- handles for indicators int BWMFI_handle; // handle of the indicato iBWMFI //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iBWMFI BWMFI_handle=iBWMFI(NULL,0,VOLUME_TICK); //--- report if there was an error in object creation if(BWMFI_handle<0) { Print("The creation of iBWMFI has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array BWMFI[] with current values of iBWMFI //--- set indexation of array BWMFI[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(BWMFI_handle,0,0,100,true,BWMFI)) return; }
iMomentum
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Momentum[]; // array for the indicator iMomentum //---- handles for indicators int Momentum_handle; // handle for the indicator iMomentum //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iMomentum Momentum_handle=iMomentum(NULL,0,14,PRICE_CLOSE); //--- report if there was an error in object creation if(Momentum_handle<0) { Print("The creation of iMomentum has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array Momentum[] with current values of iMomentum //--- set indexation of array Momentum[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(Momentum_handle,0,0,100,true,Momentum)) return; }
iMFI
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double MFI[]; // array for the indicator iMFI //---- handles for indicators int MFI_handle; // handle of the indicator iMFI //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iMFI MFI_handle=iMFI(NULL,0,14,VOLUME_TICK); //--- report if there was an error in object creation if(MFI_handle<0) { Print("The creation of iMFI has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array MFI[] with current values of iMFI //--- set indexation of array MFI[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(MFI_handle,0,0,100,true,MFI)) return; }
iMA
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double MA[]; // array for the indicator iMA //---- handles for indicators int MA_handle; // handle of the indicator iMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iMA MA_handle=iMA(NULL,0,21,0,MODE_EMA,PRICE_CLOSE); //--- report if there was an error in object creation if(MA_handle<0) { Print("The creation of iMA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array MA[] with current values of iMA //--- set indexation of array MA[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(MA_handle,0,0,100,true,MA)) return; }
iOsMA
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double OsMA[]; // array for the indicator iOsMA //---- handles for indicators int OsMA_handle; // handle of the indicator iOsMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iOsMA OsMA_handle=iOsMA(NULL,0,8,21,14,PRICE_MEDIAN); //--- report if there was an error in object creation if(OsMA_handle<0) { Print("The creation of iOsMA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array OsMA[] with current values of iOsMA //--- set indexation of array OsMA[] timeseries //--- return if there was an error if(!CopyBufferAsSeries(OsMA_handle,0,0,100,true,OsMA)) return; }
iMACD
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Main[]; // array for MAIN_LINE of iMACD double Signal[]; // array for SIGNAL_LINE of iMACD //---- handles for indicators int MACD_handle; // handle of the indicator iMACD //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iMACD MACD_handle=iMACD(NULL,0,12,26,9,PRICE_CLOSE); //--- report if there was an error in object creation if(MACD_handle<0) { Print("The creation of iMACD has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetMACDBuffers(MACD_handle,0,100,Main,Signal,true)) return; }
iOBV
#include <GetIndicatorBuffers.mqh> //---- indicator buffers double OBV[]; // array for the indicator iOBV //---- handles for indicators int OBV_handle; // handle for the indicator iOBV //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iOBV OBV_handle=iOBV(NULL,0,VOLUME_TICK); //--- report if there was an error in object creation if(OBV_handle<0) { Print("The creation of iOBV has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array OBV[] with current values of iOBV //--- set indexation of array AC[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(OBV_handle,0,0,100,true,OBV)) return; }
iSAR
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double SAR[]; // array for the indicator iSAR //---- handles for indicators int SAR_handle; // handle of the indicator iSAR //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iSAR SAR_handle=iSAR(NULL,0,0.02,0.2); //--- report if there was an error in object creation if(SAR_handle<0) { Print("The creation of iSAR has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array SAR[] with current values of iSAR //--- set indexation of array SAR[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(SAR_handle,0,0,100,true,SAR)) return; }
iRSI
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double RSI[]; // array for the indicator iRSI //---- handles for indicators int RSI_handle; // handle of the indicator iRSI //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iRSI RSI_handle=iRSI(NULL,0,21,PRICE_CLOSE); //--- report if there was an error in object creation if(RSI_handle<0) { Print("The creation of iRSI has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array RSI[] with current values of iRSI //--- set indexation of array RSI[] as timeserie //--- return if there was an error if(!CopyBufferAsSeries(RSI_handle,0,0,100,true,RSI)) return; }
iRVI
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Main[]; // array for MAIN_LINE of iRVI double Signal[]; // array for SIGNAL_LINE of iRVI //---- handles for indicators int RVI_handle; // handle of the indicator iRVI //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iRVI RVI_handle=iRVI(NULL,0,14); //--- report if there was an error in object creation if(RVI_handle<0) { Print("The creation of iRVI has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetRVIBuffers(RVI_handle,0,100,Main,Signal,true)) return; }
iStdDev
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double StdDev[]; // array for the indicator iStdDev //---- handles for indicators int StdDev_handle; // handle for the indicator iStdDev //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iStdDev StdDev_handle=iStdDev(NULL,0,20,0,MODE_SMA,PRICE_CLOSE); //--- report if there was an error in object creation if(StdDev_handle<0) { Print("The creation of iStdDev has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array StdDev[] with current values of iStdDev //--- set indexation of array StdDev[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(StdDev_handle,0,0,100,true,StdDev)) return; }
iStochastic
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Main[]; // array for MAIN_LINE of iStochastic double Signal[]; // array for SIGNAL_LINE of iStochastic //---- handles for indicators int Stochastic_handle; // handle of the indicator iStochastic //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iStochastic Stochastic_handle=iStochastic(NULL,0,5,3,3,MODE_SMA,STO_LOWHIGH); //--- report if there was an error in object creation if(Stochastic_handle<0) { Print("The creation of iStochastic has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- set indexation of arrays as timeseries //--- filling the arrays with current values of all indicator's buffers //--- return if there was an error if(!GetStochasticBuffers(Stochastic_handle,0,100,Main,Signal,true)) return; }
iTEMA
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double TEMA[]; // array for the indicator iTEMA //---- handles for indicators int TEMA_handle; // handle of the indicator iTEMA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iTEMA TEMA_handle=iTEMA(NULL,0,20,0,PRICE_CLOSE); //--- report if there was an error in object creation if(TEMA_handle<0) { Print("The creation of iTEMA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array TEMA[] with current values of iTEMA //--- set indexation of array TEMA[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(TEMA_handle,0,0,100,true,TEMA)) return; }
iTriX
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double TriX[]; // array for the indicator iTriX //---- handles for indicators int TriX_handle; // handle of the indicator iTriX //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iTriX TriX_handle=iTriX(NULL,0,20,PRICE_CLOSE); //--- report if there was an error in object creation if(TriX_handle<0) { Print("The creation of iTriX has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array TriX[] with current values of iTriX //--- set indexation of array TriX[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(TriX_handle,0,0,100,true,TriX)) return; }
iWPR
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double WPR[]; // array for the indicator iWPR //---- handles for indicators int WPR_handle; // handle of the indicator iWPR //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iWPR WPR_handle=iWPR(NULL,0,14); //--- report if there was an error in object creation if(WPR_handle<0) { Print("The creation of iWPR has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array WPR[] with current values of iWPR //--- set indexation of array WPR[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(WPR_handle,0,0,100,true,WPR)) return; }
iVIDyA
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double VIDyA[]; // array for the indicator iVIDyA //---- handles for indicators int VIDyA_handle; // handle of the indicator iVIDyA //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iVIDyA VIDyA_handle=iVIDyA(NULL,0,14,21,0,PRICE_MEDIAN); //--- report if there was an error in object creation if(VIDyA_handle<0) { Print("The creation of iVIDyA has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array VIDyA[] with current values of iVIDyA //--- set indexation of array VIDyA[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(VIDyA_handle,0,0,100,true,VIDyA)) return; }
iVolumes
#include <GetIndicatorBuffers.mqh> //---- arrays for indicators double Volumes[]; // array for the indicator iVolumes //---- handles for indicators int Volumes_handle; // handle of the indicator iVolumes //+------------------------------------------------------------------+ //| Expert initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- creation of the indicator iVolumes Volumes_handle=iVolumes(NULL,0,VOLUME_TICK); //--- report if there was an error in object creation if(Volumes_handle<0) { Print("The creation of iVolumes has failed: Runtime error =",GetLastError()); //--- forced program termination return(-1); } return(0); } //+------------------------------------------------------------------+ //| Expert tick function | //+------------------------------------------------------------------+ void OnTick() { //--- filling an array Volumes[] with current values of iVolumes //--- set indexation of array Volumes[] as timeseries //--- return if there was an error if(!CopyBufferAsSeries(Volumes_handle,0,0,100,true,Volumes)) return; }
Conclusione
- L'uso di indicatori tecnici standard negli Expert Advisors in MQL5 è semplice, come lo è nella versione precedente.
- Utilizza solo metodi di programmazione sicuri nei tuoi Expert Advisor : analizza ed escludi tutti i possibili errori. Il prezzo degli errori è troppo alto: è il tuo deposito!
Tradotto dal russo da MetaQuotes Ltd.
Articolo originale: https://www.mql5.com/ru/articles/31
File allegati |
getindicatorbuffers.mqh
(12.5 KB)
Avvertimento: Tutti i diritti su questi materiali sono riservati a MetaQuotes Ltd. La copia o la ristampa di questi materiali in tutto o in parte sono proibite.
Vai alla discussione
Introduzione a MQL5: Come scrivere un semplice Expert Advisor e un Indicatore Personalizzato
Il Linguaggio di Programmazione MetaQuotes 5 (MQL5), incluso nel Client Terminal MetaTrader 5, ha molte nuove possibilità e prestazioni più elevate rispetto a MQL4. Questo articolo ti aiuterà a familiarizzare con questo nuovo linguaggio di programmazione. I semplici esempi di come scrivere un Expert Advisor e un Indicatore Personalizzato vengono presentati in questo articolo. Considereremo anche alcuni dettagli del linguaggio MQL5, necessari per comprendere questi esempi.
L'Ordine di Creazione e Distruzione dell'oggetto in MQL5
Ogni oggetto, sia esso un oggetto personalizzato, un array dinamico o un array di oggetti, viene creato ed eliminato nel programma MQL5 nel suo modo particolare. Spesso, alcuni oggetti fanno parte di altri oggetti e l'ordine di eliminazione dell'oggetto durante la reinizializzazione diventa particolarmente importante. Questo articolo fornisce alcuni esempi che illustrano i meccanismi di utilizzo degli oggetti.
Usare i Puntatori di Oggetti in MQL5
Di default, tutti gli oggetti in MQL5 vengono passati per riferimento, ma esiste la possibilità di utilizzare i puntatori agli oggetti. Tuttavia è necessario eseguire il controllo del puntatore, poiché l'oggetto potrebbe non essere inizializzato. In questo caso, il programma MQL5 verrà terminato con errore critico e scaricato. Gli oggetti, creati automaticamente, non causano tale errore, quindi in questo senso sono abbastanza sicuri. In questo articolo, cercheremo di comprendere la differenza tra il riferimento all'oggetto e il puntatore all'oggetto e considereremo come scrivere il codice sicuro, che utilizzi i puntatori.
Limitazioni e Verifiche sugli Expert Advisors
È consentito fare trading con questo simbolo lunedì? Ci sono abbastanza soldi per aprire una posizione? Quanto è grande la perdita se si attiva lo Stop Loss? Come limitare il numero di ordini in sospeso? L'operazione commerciale è stata eseguita nella barra corrente o in quella precedente? Se un robot di trading non può eseguire questo tipo di verifiche, qualsiasi strategia di trading può rivelarsi perdente. Questo articolo mostra gli esempi di verifiche utili su qualsiasi Expert Advisor.
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