OrderModify MQL4

for(int i=OrdersTotal()-1;i>=0;i--){

    if( OrderSelect(i, SELECT_BY_POS, MODE_TRADES) ){

        // Pula ordens que não sejam desse gráfico
        if( OrderSymbol() != Symbol() && OrderMagicNumber != MagicNumber){ continue; }

        trailling = false;

        if(OrderType()==OP_BUY ){
            if(Bid - OrderStopLoss() >= TraillingStop*pointer){
                SL=NormalizeDouble(Bid-StopLoss*pointer, Digits);
                if( SL > OrderStopLoss() ){ trailling = true; }
            }
        }

        if(OrderType()==OP_SELL  ){
            if(OrderStopLoss() - Ask >= TraillingStop*pointer){
                SL=NormalizeDouble(Ask+StopLoss*pointer, Digits);
                if( SL < OrderStopLoss() ){ trailling = true; }
            }
         }

        if(trailling){
            if( !OrderModify(OrderTicket(), OrderOpenPrice(), SL, OrderTakeProfit(), 0) ){
                int Error = GetLastError();
                string ErrorText = ErrorDescription(Error);
                StringToUpper( ErrorText );
                Print("Ordem #", OrderTicket(), " não foi modificada. Código Erro: ", Error, " \"", ErrorText, "\"" );
            }
        }
    }
}