Well, it appears that the lParam and wParam were alright but I was passing them incorrectly.
I should be passing them as pointers but with or without * and & no error or warning was shown by CVI and I caught this mistake by luck.
In any case I used:
InstallWinMsgCallback(...)
RemoveWinMsgCallback (...&postHandle)
hHandle=(HWND)postHandle;
and everything os working.
Thank you for your time.
Regards.
