WindowProc

A version of this page is also available for

4/8/2010

This function is an application-defined callback function that processes messages sent to a window.

Syntax

LRESULT CALLBACK WindowProc(
  HWND hwnd, 
  UINT uMsg, 
  WPARAM wParam, 
  LPARAM lParam 
);

wParam
[in] Specifies additional message information. The contents of this parameter depend on the value of the uMsg parameter.

lParam
[in] Specifies additional message information. The contents of this parameter depend on the value of the uMsg parameter.

The return value is the result of the message processing and depends on the message sent.

Header	winuser.h
Windows Embedded CE	Windows CE 1.0 and later
Windows Mobile	Windows Mobile Version 5.0 and later