Q: which function can get a last order's information

[jilongl]

I want to write a code is based on if last order profit or lost, how can i do that??

[Simon Gniadkowski]

All you need is in here: https://docs.mql4.com/trading

[William Roeder]

    static datetime lastClose;  datetime lastClosePrev = lastClose;
    for(int pos=0; pos < OrdersHistoryTotal(); pos++) if (
        OrderSelect(pos, SELECT_BY_POS, MODE_HISTORY)   // Only orders w/
    &&  OrderCloseTime()    > lastClosePrev             // not yet processed,
    &&  OrderMagicNumber()  == magic.number             // my magic number
    &&  OrderSymbol()       == Symbol()                 // and my pair.
    &&  OrderType()         <= OP_SELL){// Avoid cr/bal forum.mql4.com/32363#325360
        lastClose = OrderCloseTime();
        if (OrderProfit() ...