Recursive Indicator as #resource fail to execute. (solved)

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1146
flaab 2016.05.06 23:35
 

Dear everyone!

I hope you are fine. I am writing an indicator that uses another one as resource, called "foobar.ex4". The calling indicator is named "FooBarScanner.ex4".

#resource "\\Indicators\\FooBar.ex4" 

int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
{
    double value = iCustom(Symbol(), Period(), "::Indicators\\FooBar.ex4", 1, 1);
}



This particular indicator (FooBar.ex4) is recursive, meaning that inside its own code, it calls itself a few times to get information with other settings.

double recursive_value = iCustom(Symbol(), Period(), WindowExpertName(), 0, 1);


The FooBar.ex4 indicator works as intended, gets information from itself using recursive calls and draws on the chart without freezing. This is not an infinite loop problem.

However, when I execute the indicator which uses FooBar.ex4 as a resource, I get several errors in the mt4 terminal, like this one:

2016.05.06 17:34:14.031 cannot load 'C:\Program Files (x86)\MetaTrader - AxiTrader\MQL4\indicators\FooBarScanner.ex4::Indicators\FooBar.ex4::Indicators\FooBar.ex4'


It seems that the WindowExpertName() function returns a very different thing when an indicator is used as a resource and the recursive call fails.

How should I do the iCustom() call inside FooBar.mq4 for the indicator to work as intended, and the iCustom() call tok work properly as well? Any ideas?

Thanks in advance!

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Moderator
3206
angevoyageur 2016.05.07 01:00 #
 

Maybe you could try to read the documentation ?

The path to itself can be received using GetRelativeProgramPath() function.


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1146
flaab 2016.05.07 01:40 #
 
angevoyageur:

Maybe you could try to read the documentation ?


Thanks Angevoyageur, helpful as always. 

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13001
WHRoeder 2016.05.07 16:00 #
 
angevoyageur: Maybe you could try to read the documentation ?
The path to itself can be received using GetRelativeProgramPath() function.
Except that no such function listed List of MQL4 Functions - MQL4 Reference
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1216
FMIC 2016.05.07 17:08 #
 
WHRoeder:
angevoyageur: Maybe you could try to read the documentation ?
The path to itself can be received using GetRelativeProgramPath() function.
Except that no such function listed List of MQL4 Functions - MQL4 Reference

It is not a built-in function! It is part of the coding example in the Resources documentation (Working with custom indicators included as resources): https://docs.mql4.com/runtime/resources

//+------------------------------------------------------------------+
//| GetRelativeProgramPath                                           |
//+------------------------------------------------------------------+
string GetRelativeProgramPath()
  {
   int pos2;
//--- get the absolute path to the application
   string path=MQLInfoString(MQL_PROGRAM_PATH);
//--- find the position of "\MQL4\" substring
   int    pos =StringFind(path,"\\MQL4\\");
//--- substring not found - error
   if(pos<0)
      return(NULL);
//--- skip "\MQL4" directory
   pos+=5;
//--- skip extra '\' symbols
   while(StringGetCharacter(path,pos+1)=='\\')
      pos++;
//--- if this is a resource, return the path relative to MQL5 directory
   if(StringFind(path,"::",pos)>=0)
      return(StringSubstr(path,pos));
//--- find a separator for the first MQL4 subdirectory (for example, MQL4\Indicators)
//--- if not found, return the path relative to MQL4 directory
   if((pos2=StringFind(path,"\\",pos+1))<0)
      return(StringSubstr(path,pos));
//--- return the path relative to the subdirectory (for example, MQL4\Indicators)
   return(StringSubstr(path,pos2+1));
  }
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Moderator
3206
angevoyageur 2016.05.07 17:59 #
 
WHRoeder:
angevoyageur: Maybe you could try to read the documentation ?
The path to itself can be received using GetRelativeProgramPath() function.
Except that no such function listed List of MQL4 Functions - MQL4 Reference
Sorry I forgot the link, it was late. FMIC gave it.
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