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MQL4 Reference  Trading functions  OrderComment

 
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string OrderComment( )
Returns comment for the selected order.
Note: The order must be previously selected by the OrderSelect() function.
Sample:
  string comment;
  if(OrderSelect(10,SELECT_BY_TICKET)==false)
    {
     Print("OrderSelect failed error code is",GetLastError());
     return(0);
    }
  comment = OrderComment();
  // ...