DSSBressertSignAlert指标：MetaTrader 5的信号提醒工具

大家好！今天我们来聊聊DSSBressertSignAlert指标，这是一款基于DSSBressert算法的信号提醒工具，适用于MetaTrader 5平台。它不仅能发出信号提醒，还可以通过电子邮件和手机推送通知来告知你买卖信号。

功能介绍

为了实现这些提醒功能，开发者对指标代码进行了如下修改：

新增输入参数：

input uint NumberofBar=1;//信号的柱数
input bool SoundON=true;//启用声音提醒
input uint NumberofAlerts=2;//提醒次数
input bool EMailON=false;//启用邮件提醒
input bool PushON=false;//启用手机推送

新增三个函数：BuySignal()、SellSignal()和GetStringTimeframe()

//+------------------------------------------------------------------+
//| 买入信号函数                                              |
//+------------------------------------------------------------------+
void BuySignal(string SignalSirname,      // 指标名称，用于邮件和推送通知
               double &BuyArrow[],        // 买入信号的指标缓冲区
               const int Rates_total,     // 当前柱数
               const int Prev_calculated, // 上一个柱数
               const double &Close[],    // 收盘价
               const int &Spread[])      // 点差
  {
u//---
   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);
     }

u//---
  }
//+------------------------------------------------------------------+
//| 卖出信号函数                                             |
//+------------------------------------------------------------------+
void SellSignal(string SignalSirname,      // 指标名称，用于邮件和推送通知
                double &SellArrow[],       // 卖出信号的指标缓冲区
                const int Rates_total,     // 当前柱数
                const int Prev_calculated, // 上一个柱数
                const double &Close[],     // 收盘价
                const int &Spread[])       // 点差
  {
u//---
   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);
     }
u//---
  }
//+------------------------------------------------------------------+
//| 获取时间框架字符串                               |
//+------------------------------------------------------------------+
string GetStringTimeframe(ENUM_TIMEFRAMES timeframe)
  {
//----
   return(StringSubstr(EnumToString(timeframe),7,-1));
//----
  }

在OnCalculate()块中调用BuySignal()和SellSignal()函数：

u//---     
   BuySignal("DSSBressertSignAlert",BuyBuffer,rates_total,prev_calculated,close,spread);
   SellSignal("DSSBressertSignAlert",SellBuffer,rates_total,prev_calculated,close,spread);
u//---

在这里，BuyBuffer和SellBuffer是用来存储买卖信号的指标缓冲区。需要注意的是，指标缓冲区中的空值可以设为零或EMPTY_VALUE。

通常情况下，在指标代码的OnCalculate()块中只会调用一次BuySignal()和SellSignal()函数。

该指标使用了SmoothAlgorithms.mqh库类（请将其复制到<terminal_data_folder>\MQL5\Include目录下）。关于类的使用，可以参考这篇文章：《中间计算平均价格序列而不使用额外缓冲区》。

图1. DSSBressertSignAlert指标在图表上的表现