windows_programming_notes.nbk: Home | Index | Next Page: DeleteObject | Previous Page: DeferWindowPos

 DefWindowProc

The DefWindowProc function calls the default window procedure to provide default processing for any window messages that an application does not process. This function ensures that every message is processed. DefWindowProc is called with the same parameters received by the window procedure.

Syntax

    LRESULT DefWindowProc(  
        HWND    hWnd,
        UINT    Msg,
        WPARAM  wParam,
        LPARAM  lParam
    );

Parameters

• hWnd
  [in] Handle to the window procedure that received the message.
• Msg
  [in] Specifies the message.
• wParam
  [in] Specifies additional message information. The content of this parameter depends on the value of the Msg parameter.
• lParam
  [in] Specifies additional message information. The content of this parameter depends on the value of the Msg parameter.

Return Value

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

Remarks

Windows 95/98/Me: DefWindowProcW is supported by the Microsoft Layer for Unicode (MSLU). To use this, you must add certain files to your application, as outlined in Microsoft Layer for Unicode on Windows 95/98/Me Systems .

Function Information

• Minimum DLL Version user32.dll
• Header Declared in Winuser.h, include Windows.h
• Import library User32.lib
• Minimum operating systems Windows 95, Windows NT 3.1
• Unicode Implemented as ANSI and Unicode versions.

windows_programming_notes.nbk: Home | Index | Next Page: DeleteObject | Previous Page: DeferWindowPos

Notebook exported on Monday, 7 July 2008, 18:56:50 PM Eastern Daylight Time