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MQL4 Reference  Trading functions  OrderOpenPrice

 
double OrderOpenPrice( )
Returns open price for the currently selected order.
Order must be first selected by the OrderSelect() function.
Sample:
  if(OrderSelect(10, SELECT_BY_POS)==true)
    Print("open price for the order 10 ",OrderOpenPrice());
  else
    Print("OrderSelect returned the error of ",GetLastError());