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MQL4 Reference  Trading functions  OrderLots

 
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double OrderLots( )
Returns amount of lots for the selected order.
Note: The order must be previously selected by the OrderSelect() function.
Sample:
  if(OrderSelect(10,SELECT_BY_POS)==true)
    Print("lots for the order 10 ",OrderLots());
  else
    Print("OrderSelect returned error of ",GetLastError());