Please quote your code 
Looking at EnumWindowsProc callback function (Windows) | Microsoft Docs the type of the cfunction should be lpEnumFunc(EnumWindowsProc, Cint, (Cint, Int)) since HWND is defined as a int and LPARAM is either a __int32 or __int64.
What part doesn’t work for you? What kind of error are you getting? I am 
only.