ThunkProc - Parameters

hwnd (HWND) - input

Window handle.

usmsg (USHORT) - input

This is an application-defined message. The value is greater than or equal to WM_USER.

mpParam1 (MPARAM) - input

Message parameter 1.

mpParam2 (MPARAM) - input

Message parameter 2.

pWndProc (PFNWP) - input

Window-procedure identifier.

mresReply (MRESULT) - returns

Message-return data.