Why this EA does not display my "indicator" on the chart?

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Hello,

It's an Expert.

Why this EA does not display my "indicator" on the chart?

Thanks,

Pierre


//+------------------------------------------------------------------+
//|                                                    eaHighLow.mq5 |
//|                        Copyright 2018, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2018, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property indicator_chart_window

#property indicator_buffers 2
#property indicator_plots   2
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrYellow
#property indicator_type2   DRAW_LINE
#property indicator_color2  clrCrimson

double HighBuffer[];
double LowBuffer[];
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//---
//--- indicator buffers mapping
   SetIndexBuffer(0,HighBuffer,INDICATOR_DATA);
   SetIndexBuffer(1,LowBuffer,INDICATOR_DATA);

   int bars=Bars(_Symbol,_Period);
   Print("bars :"+IntegerToString(bars));

   Print("ArraySize(HighBuffer) :"+IntegerToString(ArraySize(HighBuffer)));
   int copied_rates=CopyHigh(_Symbol,_Period,0,bars,HighBuffer);
   Print("ArraySize(HighBuffer) :"+IntegerToString(ArraySize(HighBuffer)));

   Print("ArraySize(LowBuffer) :"+IntegerToString(ArraySize(LowBuffer)));
   copied_rates=CopyLow(_Symbol,_Period,0,bars,LowBuffer);
   Print("ArraySize(LowBuffer) :"+IntegerToString(ArraySize(LowBuffer)));

   Print("HighBuffer[20] :"+DoubleToString(HighBuffer[20]));
   Print("LowBuffer[20] :"+DoubleToString(LowBuffer[20]));
   Print("HighBuffer[102] :"+DoubleToString(HighBuffer[102]));
   Print("LowBuffer[102] :"+DoubleToString(LowBuffer[102]));
   Print("HighBuffer[222] :"+DoubleToString(HighBuffer[222]));
   Print("LowBuffer[222] :"+DoubleToString(LowBuffer[222]));
   Print("HighBuffer[301] :"+DoubleToString(HighBuffer[301]));
   Print("LowBuffer[301] :"+DoubleToString(LowBuffer[301]));


//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---

  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---

  }
//+------------------------------------------------------------------+





 
Pierre Rougier:

Hello,

It's an Expert.

Why this EA does not display my "indicator" on the chart?

Thanks,

Pierre

You are mixing two different constructs: indicators and EA's.

If you want to see visual data on a chart, create an indicator. MetaTrade created indicators to encapsulate calculations, efficiently, and to visually display the results. You can then have an EA pull data from the indicator's buffers using iCustom().

I think perhaps some of my earlier posts on having an EA calculate data internally may be confusing. Most of the time (99% of the time) I use indicators for my calculations. Only very rarely do I do calculations internally inside an EA. That is only when the visual aspects of the indicator are not needed.

I recommend you keep indicators and EA's separate until you have an overriding reason to not do so.

 
Thanks Anthony,
Pierre8r
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