Troubles with CopyBuffer and iCustom in the Strategy Tester Visualisation

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Hello,

I have the following problem:

In my expert advisor, I sometimes have to call "CopyBuffer" on every tick. This works perfectly in combination with any of the standard indicator handles. However, when applying iCustom to the indicator handle of CopyBuffer, a new indicator window is being created on every single tick when running the EA on the Strategy Tester, which obviously makes it impossible to test the EA. Inititally, I thought this problem could perhaps be related to a mistake in my custom indicator, but even using something like "iCustom(_Symbol,PERIOD_M10,"Examples\\ATR",15)" instead of "iATR(_Symbol,PERIOD_M10,atr_ratchet_bars)" causes the very same problem. The former indicator handle causes trouble and results in 1 new indicator window per tick while testing whereas the latter works fine and results in only 1 indicator window, even if called more than once.

I hope someone can help me with this problem.

Thank you,

Leon

 
I guess I discovered a dirty workaround by changing #property indicator_separate_window to #property indicator_chart_window during the test. Nevertheless, I would be happy to see a cleaner solution to this problem.
 

Declaring an indicator handle variable at the beginning of the source code and then calling that with CopyBuffer solved the problem. I do not understand why, though.

Example:

...

int custom_handle=iCustom(_Symbol,PERIOD_M10,"Custom");
double custom[];

...

void OnTick()
{
        ...
        CopyBuffer(custom_handle,0,0,1,custom);
        ...
}
        


With that solution, everything works as it should.
 
have experienced the same problem here, thanks for your solution! It works fine!
 

I think one solution is:

...

int handle = 0;
int first = 0;

void OnTick(void)
  {
   ...
   if(first == 0)
     {
      first = 1;
      handle = iCustom(_Symbol , PERIOD_CURRENT , "Custom");
     }
  }
 
  1. JacksonClay: I think one solution is:

    1. Please edit your (original) post and use the CODE button (Alt-S)! (For large amounts of code, attach it.)
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    2. Think again. You created the handle, but haven't given the indicator time to create the data before use. Get the handle in OnInit.

  2. l.liesener: Declaring an indicator handle variable at the beginning of the source code and then calling that with CopyBuffer solved the problem. I do not understand why, though.
    Perhaps you should read the manual, especially the examples.
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    They all (including iCustom) return a handle (an int). You get that in OnInit. In OnTick (after the indicator has updated its buffers,) you use the handle, shift and count to get the data.
              Technical Indicators - Reference on algorithmic/automated trading language for MetaTrader 5
              Timeseries and Indicators Access / CopyBuffer - Reference on algorithmic/automated trading language for MetaTrader 5
              How to start with MQL5 - General - MQL5 programming forum - Page 3 #22 2020.03.08
              How to start with MQL5 - MetaTrader 5 - General - MQL5 programming forum - Page 7 #61 2020.07.05
              How to call indicators in MQL5 - MQL5 Articles 12 March 2010

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