Threading in multiple DLLs from executable and IDL file

Question

Hi

I have an application which calls multiple DLLs... I am trying to log the details from the executable code and DLL should log to the same.

I created a pure virtual method in DLL and implemented this method into class defined in application executable code. While calling DLL functions , passing class pointer as argument and everything works fine in threads also.

Thanks to Martin for his support on this:
https://www.sololearn.com/Discuss/2854592/?ref=app

Now one challenge is that one of the DLL is com object and there I can't include virtual method header file used in all other DLLs .... This is my understanding and not sure much but header prepared based on c++ 11 was giving error to be included in idl file.

Is there any solution on this ?