WPARAM and LPARAM parameters

Question

When passing a value to a function that takes both a WPARAM and a LPARAM parameter, does it matter on which of them I pass it? Someone told me that if I use Windows x64 I sh

Answer 1

Yes, it does. I once passed them in swapped order and the function I call fails. Nevertheless, you should consult MSDN when in doubt. I never program in Win64 though, so I don't whether there are differences between Win32 and Win64 regarding WPARAM/LPARAM behavior.