TypePendingOrderTriggered - expert for MetaTrader 5

The Expert Advisor shows an example of how to solve the following problem: How to determine the moment when a pending order has triggered?

How the expert advisor works: in the OnTradeTransaction() function, we wait for a transaction of type "TRADE_TRANSACTION_DEAL_ADD":

Once we "catch" such a transaction, we immediately use the "bln_find_order" flag to search for an order and assign the order ticket to the "ul_find_order" variable:

//+------------------------------------------------------------------+
//| TradeTransaction function                                        |
//+------------------------------------------------------------------+
void OnTradeTransaction(const MqlTradeTransaction &trans,
                        const MqlTradeRequest &request,
                        const MqlTradeResult &result)
  {
//+------------------------------------------------------------------+
//| TRADE_TRANSACTION_DEAL_*                                         |
//| The following fields in MqlTradeTransaction structure            |
//| are filled for trade transactions related to deals handling      |
//| (TRADE_TRANSACTION_DEAL_ADD, TRADE_TRANSACTION_DEAL_UPDATE       |
//| and TRADE_TRANSACTION_DEAL_DELETE):                              |
//|  •deal - deal ticket;                                            |
//|  •order - order ticket, based on which a deal has been performed;|
//|  •symbol - deal symbol name;                                     |
//|  •type - trade transaction type;                                 |
//|  •deal_type - deal type;                                         |
//|  •price - deal price;                                            |
//|  •price_sl - Stop Loss price (filled, if specified in the order, |
//|  •based on which a deal has been performed);                     |
//|  •price_tp - Take Profit price (filled, if specified             |
//|   in the order, based on which a deal has been performed);       |
//|  •volume - deal volume in lots.                                  |
//|  •position - the ticket of the position that was opened,         |
//|   modified or closed as a result of deal execution.              |
//|  •position_by - the ticket of the opposite position.             |
//|   It is only filled for the out by deals                         |
//|   (closing a position by an opposite one).                       |
//+------------------------------------------------------------------+
//--- get transaction type as enumeration value  
   ENUM_TRADE_TRANSACTION_TYPE type=trans.type;
//--- if transaction is result of addition of the transaction in history
   if(type==TRADE_TRANSACTION_DEAL_ADD)
     {
      bln_find_order=true;                // true -> you should look for a order
      ul_find_order=trans.order;
     }
  }

In OnTick(), we always check the state of the "bln_find_order" flag; as soon as the flag is equal to true, we start to search for the order.

• First we try to find the order by ticket
• If the attempt succeeds (which means that the order has already been written to history), we determine the order type. In order to access the property of an order from the trade history, use HistoryOrderGetInteger.

//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---
   if(bln_find_order) // true -> you should look for a order
     {
      static long counter=0;
      Print("Attempt number ",counter);
      ResetLastError();
      if(HistoryOrderSelect(ul_find_order))
        {
         long type_order=HistoryOrderGetInteger(ul_find_order,ORDER_TYPE);
         if(type_order==ORDER_TYPE_BUY_LIMIT || type_order==ORDER_TYPE_BUY_STOP ||
            type_order==ORDER_TYPE_SELL_LIMIT ||type_order==ORDER_TYPE_SELL_STOP)
           {
            Print("The pending order ",ul_find_order," is found! Type of order is ",
                  EnumToString((ENUM_ORDER_TYPE)HistoryOrderGetInteger(ul_find_order,ORDER_TYPE)));
            bln_find_order=false;         // true -> you should look for a order
            counter=0;
            return;
           }
         else
           {
            Print("The order ",ul_find_order," is not pending");
            bln_find_order=false;         // true -> you should look for a order
            return;
           }
        }
      else
        {
         Print("Order ",ul_find_order," is not find, error#",GetLastError());
        }
      counter++;
     }
  }