.\" -*- nroff -*-
.\" Generated file - DO NOT EDIT!
.TH CallWindowProcA 3w "Oct 2012" "Wine API" "Wine API"

.SH NAME
\fBCallWindowProcA\fR (USER32.@)
.SH SYNOPSIS
LRESULT CallWindowProcA
 (
  WNDPROC \fIfunc\fR,
  HWND    \fIhwnd\fR,
  UINT    \fImsg\fR,
  WPARAM  \fIwParam\fR,
  LPARAM  \fIlParam\fR
 )

.SH PARAMS
\fIfunc\fR \fB[In]\fR  window procedure.
.PP
\fIhwnd\fR \fB[In]\fR  target window.
.PP
\fImsg\fR \fB[In]\fR  message.
.PP
\fIwParam\fR \fB[In]\fR  message dependent parameter.
.PP
\fB[In]\fR  message dependent parameter.
.PP

.SH DESCRIPTION
.PP
The \fBCallWindowProc(3w)\fR 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_. 
.PP
Some kinds of argument conversion may be done, I'm not sure what. 
.PP
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 \fBCallWindowProc(3w)\fR with _func_ set to the parent class's Windows(tm) procedure to dispatch the message to the superclass. 

.SH RETURNS
.PP
The return value is message dependent. 

.SH CONFORMANCE
.PP
ECMA-\fB234\fR, Win32 

.SH IMPLEMENTATION
.PP
Declared in \fB"winuser.h"\fR. 
.PP
Implemented in \fB"dlls/user32/winproc.c"\fR. 
.PP
Debug channel \fB"win"\fR.