I'm getting following error while trying to use EnumWindow

error C2664: 'EnumWindows' : cannot convert parameter 1 from 'int (struct HWND__ *,long)' to 'int (__stdcall *)(struct HWND__ *,long)'

Any help....

You need to remove declaration of EnumWindowsProc from the calss scope.
Declare it outside of the class and it will work.

Declare it in .h or .cpp file at top.

This function cannot be declared as a class member as it has to be global and requires a different calling convention.