Check if custom indicators exist's

[sunshineh]

How can I check, if the custom indicator exists??

[William Roeder]

Call iCustom, check GetLastError. Probably ERR_CUSTOM_INDICATOR_ERROR 4055 Custom indicator error.

[Arturo Lopez Perez]

William Roeder:
Call iCustom, check GetLastError. Probably ERR_CUSTOM_INDICATOR_ERROR 4055 Custom indicator error.

If loading failed, GetLastError() will return 4072, not ERR_CUSTOM_INDICATOR_ERROR 4055. Just in case you can use this code:

// Make call
double value = iCustom(Symbol(), Period() "IndiNameHere", buffer, shift);
     
// If failed
if(value == 0)
{
         // Err code
         int err = GetLastError();
         
         // Print error
         if(err == ERR_CUSTOM_INDICATOR_ERROR || err == 4072)
         {
            Print("[ERROR] Could not find custom indicator");
            return(0);
         } 
}

[Pavel Shutovskiy]

The Indicators folder is located outside the file sandbox, and you cannot check for a file using standard tools

in the absence of an indicator in the log will be an error as written above

to avoid this error, you can connect as a resource

https://www.mql5.com/en/docs/runtime/resources