Thanks for the info. I'll try and see how it goes. This DLL is produced by other group I don't have the source code.
According to Paul Vlad Tatavu Cstrings from MFC cannot be exported to C.
I need to find the way for this to work. Maybe I would need to do an intermediate DLL in C++ to access this and export this in C strings. I hope I don't need to add another interface !

Thanks again.
Regards.