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CallWindowProcA.3w
Langue: en
Version: Jun 2009 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
CallWindowProcA (USER32.@)SYNOPSIS
LRESULT CallWindowProcA(
WNDPROC func,
HWND hwnd,
UINT msg,
WPARAM wParam,
LPARAM lParam
)
PARAMS
func [In] window procedure.hwnd [In] target window.
msg [In] message.
wParam [In] message dependent parameter.
[In] message dependent parameter.
DESCRIPTION
The CallWindowProc(3w) function invokes the Windows(tm) procedure _func_, with _hwnd_ as the target window, the message specified by _msg_, and the message parameters _wParam_ and _lParam_.
Some kinds of argument conversion may be done, I'm not sure what.
CallWindowProc() may be used for Windows(tm) subclassing. Use SetWindowLong() to set a new Windows(tm) procedure for Windows(tm) of the subclass, and handle subclassed messages in the new windows procedure. The new Windows(tm) procedure may then use CallWindowProc(3w) with _func_ set to the parent class's Windows(tm) procedure to dispatch the message to the superclass.
RETURNS
The return value is message dependent.
CONFORMANCE
ECMA-234, Win32
IMPLEMENTATION
Defined in "winuser.h".
Implemented in "dlls/user32/winproc.c".
Debug channel "win".
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