真实作者：
保罗·斯特林
Harami_Alert指标能够识别Harami形态，并提供警报、邮件和推送通知功能。
为了实现这些功能，我们对指标代码进行了以下更改：
- 引入了新的输入参数
input uint NumberofBar=1;//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; //启用发送信号到移动设备
- 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, // 邮件和推送消息中的指标名称 double &BuyArrow[], // 存储买入信号的指标缓冲区 const int Rates_total, // 当前柱数 const int Prev_calculated, // 上一轮计算的柱数 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(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]*_Point; 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); } //--- } //+------------------------------------------------------------------+ //| 卖出信号函数 | //+------------------------------------------------------------------+ void SellSignal(string SignalSirname, // 邮件和推送消息中的指标名称 double &SellArrow[], // 存储卖出信号的指标缓冲区 const int Rates_total, // 当前柱数 const int Prev_calculated, // 上一轮计算的柱数 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(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]*_Point; 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); } //--- } //+------------------------------------------------------------------+ //| 获取时间框架字符串 | //+------------------------------------------------------------------+ string GetStringTimeframe(ENUM_TIMEFRAMES timeframe) { //---- return(StringSubstr(EnumToString(timeframe),7,-1)); //---- }
- 在OnCalculate()块中的指标计算周期后添加了BuySignal()和SellSignal()函数的调用
//--- BuySignal("Harami_Alert",BuyBuffer,rates_total,prev_calculated,close,spread); SellSignal("Harami_Alert",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标缓冲区。对于指标缓冲区中的空值，可以设置为零或EMPTY_VALUE。
假设在指标代码的OnCalculate()块中仅使用一次BuySignal()和SellSignal()函数的调用。
最初该指标是用MQL4编写的，并于2016年6月14日首次发布在代码库上。
图1. Harami_Alert指标在图表上
图2. Harami_Alert. 生成警报