MQL4参考 交易函数 OrderLots
Returns amount of lots of the selected order.
double OrderLots();
Returned value
Amount of lots (trade volume) of the selected order.
Note
The order must be previously selected by the OrderSelect() function.
Example:
if(OrderSelect(10,SELECT_BY_POS)==true) Print("lots for the order 10 ",OrderLots()); else Print("OrderSelect returned error of ",GetLastError());