How set stoploss on open price of current bar? (actually bar)

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Hello, how i set stoploss on open price of current bar in my EA? Thank you

[William Roeder]

    for(pos = OrdersTotal()-1; pos >= 0 ; pos--) if (
        OrderSelect(pos, SELECT_BY_POS)                 // Only my orders w/
    &&  OrderMagicNumber()  == magic.number             // my magic number
    &&  OrderSymbol()       == Symbol() ){              // and my pair.
        if( !OrderModify(OrderTicket(), OrderOpenPrice(),
                         Open[0], OrderTakeProfit(), 0) 
        ) Alert( "OrderModify(ticket=", OrderTicket(),"...) Failed: ", GetLastError());
    }

[[Deleted]]

WHRoeder:

Thank you for code but this code i must copy to expert start function or Variable function?

[[Deleted]]

Expert start.

Don't even know what you mean by variable function :))