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谁有布林线的MT4指标？ 请帮忙找找啊

#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 LightSeaGreen
#property indicator_color2 LightSeaGreen
#property indicator_color3 LightSeaGreen
//---- indicator parameters
extern int    BandsPeriod=20;
extern int    BandsShift=0;
extern double BandsDeviations=2.0;
//---- buffers
double MovingBuffer[];
double UpperBuffer[];
double LowerBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                        |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
  SetIndexStyle(0,DRAW_LINE);
  SetIndexBuffer(0,MovingBuffer);
  SetIndexStyle(1,DRAW_LINE);
  SetIndexBuffer(1,UpperBuffer);
  SetIndexStyle(2,DRAW_LINE);
  SetIndexBuffer(2,LowerBuffer);
//----
  SetIndexDrawBegin(0,BandsPeriod+BandsShift);
  SetIndexDrawBegin(1,BandsPeriod+BandsShift);
  SetIndexDrawBegin(2,BandsPeriod+BandsShift);
//----
  return(0);
  }
//+------------------------------------------------------------------+
//| Bollinger Bands                                                  |
//+------------------------------------------------------------------+
int start()
  {
  int    i,k,counted_bars=IndicatorCounted();
  double deviation;
  double sum,oldval,newres;
//----
  if(Bars<=BandsPeriod) return(0);
//---- initial zero
  if(counted_bars<1)
      for(i=1;i<=BandsPeriod;i++)
        {
        MovingBuffer[Bars-i]=EMPTY_VALUE;
        UpperBuffer[Bars-i]=EMPTY_VALUE;
        LowerBuffer[Bars-i]=EMPTY_VALUE;
        }
//----
  int limit=Bars-counted_bars;
  if(counted_bars>0) limit++;
  for(i=0; i<limit; i++)
      MovingBuffer=iMA(NULL,0,BandsPeriod,BandsShift,MODE_SMA,PRICE_CLOSE,i);
//----
  i=Bars-BandsPeriod+1;
  if(counted_bars>BandsPeriod-1) i=Bars-counted_bars-1;
  while(i>=0)
    {
      sum=0.0;
      k=i+BandsPeriod-1;
      oldval=MovingBuffer;
      while(k>=i)
        {
        newres=Close[k]-oldval;
        sum+=newres*newres;
        k--;
        }
      deviation=BandsDeviations*MathSqrt(sum/BandsPeriod);
      UpperBuffer=oldval+deviation;
      LowerBuffer=oldval-deviation;
      i--;
    }
//----
  return(0);
  }