iWPRSignAlert：MetaTrader 5的信号指示器解析

iWPRSignAlert是一款基于经典Williams百分比范围振荡器的信号指示器，这款指示器能够有效识别超买和超卖区域，并提供实时警报功能，包括邮件和移动设备推送通知。

为了实现这些警报功能，开发者对指示器代码进行了以下几项修改：

引入了新的输入参数：

input uint NumberofBar=1;//信号的K线数量
input bool SoundON=true; //启用声音警报
input uint NumberofAlerts=2;//警报次数
input bool EMailON=false; //启用邮件通知
input bool PushON=false; //启用推送通知

在指示器代码末尾添加了三个新功能：BuySignal()、SellSignal()和GetStringTimeframe()

//+------------------------------------------------------------------+
//| 买入信号函数                           |
//+------------------------------------------------------------------+
void BuySignal(string SignalSirname,      // 指示器名称的文本，用于邮件和推送消息
               double &BuyArrow[],        // 包含买入信号的指示器缓冲区
               const int Rates_total,     // 当前K线数量
               const int Prev_calculated, // 上一根K线数量
               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(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 信号 
 Ask=",Ask,"
 Bid=",Bid,"
 currtime=",text,"
 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);
     }

//---
  }
//+------------------------------------------------------------------+
//| 卖出信号函数                            |
//+------------------------------------------------------------------+
void SellSignal(string SignalSirname,      // 指示器名称的文本，用于邮件和推送消息
                double &SellArrow[],       // 包含卖出信号的指示器缓冲区
                const int Rates_total,     // 当前K线数量
                const int Prev_calculated, // 上一根K线数量
                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(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 信号 
 Ask=",Ask,"
 Bid=",Bid,"
 currtime=",text,"
 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);
     }
//---
  }
//+------------------------------------------------------------------+
//|  获取时间框架字符串                               |
//+------------------------------------------------------------------+
string GetStringTimeframe(ENUM_TIMEFRAMES timeframe)
  {
//----
   return(StringSubstr(EnumToString(timeframe),7,-1));
//----
  }

在OnCalculate()代码块的指示器计算周期后，添加了BuySignal()和SellSignal()函数的调用：

BuySignal("iWPRSign",BuyBuffer,rates_total,prev_calculated,close,spread);
    SellSignal("iWPRSign",SellBuffer,rates_total,prev_calculated,close,spread);

其中，BuyBuffer和SellBuffer是用于存储买入和卖出信号的指示器缓冲区。必须将指示器缓冲区中的空值设置为零或EMPTY_VALUE。

预计在指示器代码的OnCalculate()块中，只会调用一次BuySignal()和SellSignal()函数。

图1：iWPRSignAlert指示器

图1：iWPRSignAlert指示器在图表上

图2：iWPRSignAlert指示器生成警报

图2：iWPRSignAlert指示器生成警报。

iWPRSignAlert：MetaTrader 5的信号指示器解析

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