Mastering the Trailing Stop with Magic Number in MetaTrader 4

Hey traders! Let’s dive into how a trailing stop can really boost your trading game by moving the stop loss into profit territory, ensuring we keep our gains secured automatically.

We’ll kick things off by setting the input parameters for our trailing stop in the code:

input    bool     isTrailingStop = true;  // Enable Trailing Stopinput    int       trailingStart  = 15;    // Trailing Start (pips)input    int       trailingStep   = 5;     // Trailing Step (pips)input    int       MagicNumber = 0;        // Magic Number

Now, let’s set up a global variable:

// Global Variabledouble   myPoint    = 0.0;

When we run this Expert Advisor (EA), the OnInit() function will be executed for the first time, where we will validate and initialize our input variables:

intOnInit()
  {
    if (isTrailingStop && trailingStart <= 0){
      Alert ("Parameters incorrect");
      return(INIT_PARAMETERS_INCORRECT);
   }
   
     myPoint     = GetPipPoint(Symbol());
   
    return(INIT_SUCCEEDED);
  }

Every time there’s a price movement (tick) on the chart where this EA is active, the OnTick() function will be executed. Inside this function, we’ll call setTrailingStop():

voidOnTick()
  {
  //---
     setTrailingStop(MagicNumber);
  }

Now, let’s look at the setTrailingStop() function:

void setTrailingStop(int magicNumber=0){
   if (isTrailingStop==false) return;
   
   int      tOrder = 0;
   string   pair = "";
   double   sl = 0.0, tp = 0.0;
   
   pair = Symbol();
   
   tOrder = OrdersTotal();
   for (int i=tOrder-1; i>=0; i--){
      bool hrsSelect = OrderSelect(i, SELECT_BY_POS, MODE_TRADES);
      if (OrderMagicNumber() == magicNumber && StringFind(OrderSymbol(), pair, 0) == 0 ){
         if (OrderType() == OP_BUY){
            if ( (Bid - (trailingStart * myPoint)) >= OrderOpenPrice()
              && (Bid - ((trailingStart+trailingStep) * myPoint) >= OrderStopLoss() )
              ){
               sl = NormalizeDouble(Bid - (trailingStart * myPoint), Digits());
               if (!OrderModify(OrderTicket(), OrderOpenPrice(), sl, OrderTakeProfit(), 0, clrBlue)){
                  Print ("#", OrderTicket(), " failed to update SL");
               }
            }
         }
         
         if (OrderType() == OP_SELL){
            if ( (Ask + (trailingStart * myPoint)) <= OrderOpenPrice()
              && ( (Ask + ((trailingStart+trailingStep) * myPoint) <= OrderStopLoss() ) || OrderStopLoss() == 0.0)
               )
        {
               sl = NormalizeDouble(Ask + (trailingStart * myPoint), Digits() );
               if (!OrderModify(OrderTicket(), OrderOpenPrice(), sl, OrderTakeProfit(), 0, clrBlue)){
                  Print ("#", OrderTicket(), " failed to update SL");
               }
            }
         }
      } //end if magicNumber
   }//end for
}

Another essential function you’ll need is GetPipPoint():

// Function GetPipPointdouble GetPipPoint(string pair)
{
   double point= 0.0;
   int digits = (int) MarketInfo(pair, MODE_DIGITS);
   if(digits == 2 || digits== 3) point= 0.01;
   elseif(digits== 4 || digits== 5) point= 0.0001;
   return(point);
}

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