WeightOscillator_Alert：MetaTrader 5的趋势警报指标

WeightOscillator 趋势指标新增了警报功能，支持发送邮件和推送通知到移动设备，让你不错过任何交易机会。

为了实现警报、邮件和推送通知功能，指标代码进行了以下修改：

在输入变量声明之前，声明了全局作用域的信号生成选项枚举。
//+----------------------------------------------------+
//| 信号生成选项枚举   |
//+----------------------------------------------------+
enum ENUM_SIGNAL_MODE
  {
   MODE_SIGNAL,  //突破信号
   MODE_TREND    //突破和趋势信号
  };
新增了输入参数
//---- 警报输入变量
input ENUM_SIGNAL_MODE SignMode=MODE_SIGNAL; //信号生成模式
input uint NumberofBar=1;                    //生成信号的柱数
input bool SoundON=true;                     //启用警报
input uint NumberofAlerts=2;                 //警报数量
input bool EMailON=false;                    //启用邮件发送信号
input bool PushON=false;                     //启用移动设备推送信号
在指标代码末尾添加了三个新函数：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消息
               double &ColorArray[],// 颜色索引缓冲区
               int ColorIndex,// 颜色索引
               const int Rates_total,     // 当前柱数
               const int Prev_calculated, // 上一个tick的柱数
               const double &Close[],     // 收盘价
               const int &Spread[])       // 点差
  {
//---
   static uint counter=0;
   if(Rates_total!=Prev_calculated) counter=0;

   bool BuySignal=false;
   bool SeriesTest=ArrayGetAsSeries(ColorArray);
   int index,index1;
   if(SeriesTest)
     {
      index=int(NumberofBar);
      index1=index+1;
     }
   else
     {
      index=Rates_total-int(NumberofBar)-1;
      index1=index-1;
     }
   if(SignMode==MODE_SIGNAL)
     {
      if(ColorArray[index1]!=ColorIndex && ColorArray[index]==ColorIndex) BuySignal=true;
     }
   else
     {
      if(ColorArray[index]==ColorIndex) 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+=_Point*Spread[index];
      string sAsk=DoubleToString(Ask,_Digits);
      string sBid=DoubleToString(Bid,_Digits);
      string sPeriod=GetStringTimeframe(ChartPeriod());
      if(SignMode==MODE_SIGNAL || (SignMode==MODE_TREND && ColorArray[index1]!=ColorIndex))
        {
         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);
        }
      else
        {
         if(SoundON) Alert("Up Trend signal \n Ask=",Ask,"\n Bid=",Bid,"\n currtime=",text,"\n Symbol=",Symbol()," Period=",sPeriod);
         if(EMailON) SendMail(SignalSirname+": Up Trend signal alert","BUY signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
         if(PushON) SendNotification(SignalSirname+": Up Trend signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
        }
     }

//---
  }
//+------------------------------------------------------------------+
//| 卖出信号函数                                             |
//+------------------------------------------------------------------+
void SellSignal(string SignalSirname,// 指标名称用于邮件和推送消息
                double &ColorArray[],       // 颜色索引缓冲区
                int ColorIndex,             // 颜色索引
                const int Rates_total,     // 当前柱数
                const int Prev_calculated, // 上一个tick的柱数
                const double &Close[],     // 收盘价
                const int &Spread[])       // 点差
  {
//---
   static uint counter=0;
   if(Rates_total!=Prev_calculated) counter=0;

   bool SellSignal=false;
   bool SeriesTest=ArrayGetAsSeries(ColorArray);
   int index,index1;
   if(SeriesTest)
     {
      index=int(NumberofBar);
      index1=index+1;
     }
   else
     {
      index=Rates_total-int(NumberofBar)-1;
      index1=index-1;
     }

   if(SignMode==MODE_SIGNAL)
     {
      if(ColorArray[index1]!=ColorIndex && ColorArray[index]==ColorIndex) SellSignal=true;
     }
   else
     {
      if(ColorArray[index]==ColorIndex) 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+=_Point*Spread[index];
      string sAsk=DoubleToString(Ask,_Digits);
      string sBid=DoubleToString(Bid,_Digits);
      string sPeriod=GetStringTimeframe(ChartPeriod());
      if(SignMode==MODE_SIGNAL || (SignMode==MODE_TREND && ColorArray[index1]!=ColorIndex))
        {
         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);
        }
      else
        {
         if(SoundON) Alert("Down trend signal \n Ask=",Ask,"\n Bid=",Bid,"\n currtime=",text,"\n Symbol=",Symbol()," Period=",sPeriod);
         if(EMailON) SendMail(SignalSirname+": Down trend signal alert","SELL signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
         if(PushON) SendNotification(SignalSirname+": Down trend signal at Ask="+sAsk+", Bid="+sBid+", Date="+text+" Symbol="+Symbol()+" Period="+sPeriod);
        }
     }
//---
  }
//+------------------------------------------------------------------+
//| 获取时间框架作为字符串 |
//+------------------------------------------------------------------+
string GetStringTimeframe(ENUM_TIMEFRAMES timeframe)
  {
//----
   return(StringSubstr(EnumToString(timeframe),7,-1));
//----
  }
在 OnCalculate() 块中添加了对 BuySignal() 和 SellSignal() 函数的调用。
//---
   BuySignal("WeightOscillator_Alert",ColorBuffer,0,rates_total,prev_calculated,close,spread);
   SellSignal("WeightOscillator_Alert",ColorBuffer,4,rates_total,prev_calculated,close,spread);
//---

其中 ColorBuffer 为存储指标颜色的颜色索引缓冲区。值 0 和 4 代表该振荡器处于超买和超卖区域。

预计在指标代码的 OnCalculate() 块中只会调用一次 BuySignal() 和 SellSignal() 函数。

该指标使用了 SmoothAlgorithms.mqh 库的类（请将其复制到 <terminal_data_folder>\MQL5\Include）。有关类的使用已在文章中详细说明，文章链接为"Averaging Price Series for Intermediate Calculations Without Using Additional Buffers"。

图1. WeightOscillator_Alert 指标在图表上的表现