真实作者：dimeon
ColorXdinMA是一款在MetaTrader 5上使用的趋势移动平均线指标，它具备发送警报、电子邮件和移动设备推送通知的功能。
为了实现这些警报功能，指标代码进行了以下更改：
- 在输入变量声明之前，全局声明了指标信号生成选项的枚举类型。//+----------------------------------------------------+
//| 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//---- 警报的输入变量
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; //启用邮件信号
input bool PushON=false; //启用移动设备信号推送 - 在指标代码的末尾添加了三个新函数：BuySignal()、SellSignal()和GetStringTimeframe()//+------------------------------------------------------------------+
//| 买入信号函数 |
//+------------------------------------------------------------------+
void BuySignal(string SignalSirname,// 指标名称文本，用于电子邮件和推送消息
double &ColorArray[],// 颜色索引缓冲区
int ColorIndex,// 生成信号的颜色索引
const int Rates_total, // 当前柱数
const int Prev_calculated, // 上一个刻度的柱数
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,// 指标名称文本，用于电子邮件和推送消息
double &ColorArray[], // 颜色索引缓冲区
int ColorIndex, // 生成信号的颜色索引
const int Rates_total, // 当前柱数
const int Prev_calculated, // 上一个刻度的柱数
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);
}
}
//---
}
//+------------------------------------------------------------------+
//| 获取时间框架的字符串 |
//+------------------------------------------------------------------+
string GetStringTimeframe(ENUM_TIMEFRAMES timeframe)
{
//----
return(StringSubstr(EnumToString(timeframe),7,-1));
//----
} - 在OnCalculate()代码块的指标计算周期后添加了BuySignal()和SellSignal()的调用。//---
BuySignal("ColorXdinMA_Alert",ColorXdinMA,1,rates_total,prev_calculated,close,spread);
SellSignal("ColorXdinMA_Alert",ColorXdinMA,2,rates_total,prev_calculated,close,spread);
//---
其中，ColorXdinMA是用于存储指标颜色的颜色索引缓冲区的名称。值1和2分别是移动平均线上升或下降时该缓冲区中的颜色编号。
假设在指标代码的OnCalculate()块中只会调用一次BuySignal()和SellSignal()函数。
该指标使用SmoothAlgorithms.mqh库的类（将其复制到<terminal_data_folder>\MQL5\Include）。关于类的使用，已在文章《不使用额外缓冲区进行中间计算的价格序列平均化》中进行了详细描述。
图1. ColorXdinMA_Alert指标在图表上的显示
图2. ColorXdinMA_Alert指标。生成突破信号的警报
图3. ColorXdinMA_Alert指标。生成趋势信号的警报