BeginnerAlert - indicateur pour MetaTrader 5

Real author:

EarnForex

This indicator displays the trend extremums (maximum and minimum), which may be used as the support and resistance points. It is useful for determining the channel of the current trend. It features alerts, sending emails and push-notifications to mobile devices.

This is a simple indicator that uses a certain period to find the minimum and maximum and to mark them with dots.

The following changes have been made to the indicator code in order to implement the alerts, email messages and push-notifications:

1. Introduced new input parameters

   input uint NumberofBar=1;//Bar number for the signal
   input bool SoundON=true; //Enable alerts
   input uint NumberofAlerts=2;//Number of alerts
   input bool EMailON=false; //Enable mailing the signal
   input bool PushON=false; //Enable sending the signal to mobile devices
   

2. Added three new functions to the end of the indicator code: BuySignal(), SellSignal() and GetStringTimeframe()

   //+------------------------------------------------------------------+
   //| Buy signal function                                              |
   //+------------------------------------------------------------------+
   void BuySignal(string SignalSirname,      // text of the indicator name for email and push messages
                  double &BuyArrow[],        // indicator buffer with buy signals
                  const int Rates_total,     // the current number of bars
                  const int Prev_calculated, // the number of bars on the previous tick
                  const double &Close[],     // close price
                  const int &Spread[])       // spread
     {
   //---
      static uint counter=0;
      if(Rates_total!=Prev_calculated) counter=0;
   
      bool BuySignal=false;
      bool SeriesTest=ArrayGetAsSeries(BuyArrow);
      int index;
      if(SeriesTest) index=int(NumberofBar);
      else index=Rates_total-int(NumberofBar)-1;
      if(NormalizeDouble(BuyArrow[index],_Digits) && BuyArrow[index]!=EMPTY_VALUE) BuySignal=true;
      if(BuySignal && counter<=NumberofAlerts)
        {
         counter++;
         MqlDateTime tm;
         TimeToStruct(TimeCurrent(),tm);
         string text=TimeToString(TimeCurrent(),TIME_DATE)+" "+string(tm.hour)+":"+string(tm.min);
         SeriesTest=ArrayGetAsSeries(Close);
         if(SeriesTest) index=int(NumberofBar);
         else index=Rates_total-int(NumberofBar)-1;
         double Ask=Close[index];
         double Bid=Close[index];
         SeriesTest=ArrayGetAsSeries(Spread);
         if(SeriesTest) index=int(NumberofBar);
         else index=Rates_total-int(NumberofBar)-1;
         Bid+=Spread[index];
         string sAsk=DoubleToString(Ask,_Digits);
         string sBid=DoubleToString(Bid,_Digits);
         string sPeriod=GetStringTimeframe(ChartPeriod());
         if(SoundON) Alert("BUY signal \n Ask=",Ask,"\n Bid=",Bid,"\n currtime=",text,"\n Symbol=",Symbol()," Period=",sPeriod);
         if(EMailON) SendMail(SignalSirname+": BUY signal alert","BUY signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
         if(PushON) SendNotification(SignalSirname+": BUY signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
        }
   
   //---
     }
   //+------------------------------------------------------------------+
   //| Sell signal function                                             |
   //+------------------------------------------------------------------+
   void SellSignal(string SignalSirname,      // text of the indicator name for email and push messages
                   double &SellArrow[],       // indicator buffer with sell signals
                   const int Rates_total,     // the current number of bars
                   const int Prev_calculated, // the number of bars on the previous tick
                   const double &Close[],     // close price
                   const int &Spread[])       // spread
     {
   //---
      static uint counter=0;
      if(Rates_total!=Prev_calculated) counter=0;
   
      bool SellSignal=false;
      bool SeriesTest=ArrayGetAsSeries(SellArrow);
      int index;
      if(SeriesTest) index=int(NumberofBar);
      else index=Rates_total-int(NumberofBar)-1;
      if(NormalizeDouble(SellArrow[index],_Digits) && SellArrow[index]!=EMPTY_VALUE) SellSignal=true;
      if(SellSignal && counter<=NumberofAlerts)
        {
         counter++;
         MqlDateTime tm;
         TimeToStruct(TimeCurrent(),tm);
         string text=TimeToString(TimeCurrent(),TIME_DATE)+" "+string(tm.hour)+":"+string(tm.min);
         SeriesTest=ArrayGetAsSeries(Close);
         if(SeriesTest) index=int(NumberofBar);
         else index=Rates_total-int(NumberofBar)-1;
         double Ask=Close[index];
         double Bid=Close[index];
         SeriesTest=ArrayGetAsSeries(Spread);
         if(SeriesTest) index=int(NumberofBar);
         else index=Rates_total-int(NumberofBar)-1;
         Bid+=Spread[index];
         string sAsk=DoubleToString(Ask,_Digits);
         string sBid=DoubleToString(Bid,_Digits);
         string sPeriod=GetStringTimeframe(ChartPeriod());
         if(SoundON) Alert("SELL signal \n Ask=",Ask,"\n Bid=",Bid,"\n currtime=",text,"\n Symbol=",Symbol()," Period=",sPeriod);
         if(EMailON) SendMail(SignalSirname+": SELL signal alert","SELL signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
         if(PushON) SendNotification(SignalSirname+": SELL signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
        }
   //---
     }
   //+------------------------------------------------------------------+
   //|  Getting the timeframe as a string                               |
   //+------------------------------------------------------------------+
   string GetStringTimeframe(ENUM_TIMEFRAMES timeframe)
     {
   //----
      return(StringSubstr(EnumToString(timeframe),7,-1));
   //----
     }
   

3. Added a couple of calls to BuySignal() and SellSignal() functions after the indicator calculation cycles in the OnCalculate() block

   //---     
      BuySignal("BeginnerAlert",BuyBuffer,rates_total,prev_calculated,Close,spread);
      SellSignal("BeginnerAlert",SellBuffer,rates_total,prev_calculated,Close,spread);
   //--- 
   

Where BuyBuffer and SellBuffer are the names of the indicator buffers for storing the buy and sell signals. As the empty values in the indicator buffers either zeros or EMPTY_VALUE must be set.

It is assumed that the only one call to the BuySignal() and SellSignal() functions will be used in the OnCalculate() block of the indicator code.

Originally this indicator has been written in MQL4 and was first published in the Code Base on 03.09.2008.

Fig1. The BeginnerAlert indicator on the chart

Fig.2. The BeginnerAlert indicator Generating alerts.