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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

C++


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

Parameters

hWnd [in]

Type: HWND

A handle to the window procedure that received the message.

Msg [in]

Type: UINT

The message.

wParam [in]

Type: WPARAM

Additional message information. The content of this parameter depends on the value of the Msg parameter.

lParam [in]

Type: LPARAM

Additional message information. The content of this parameter depends on the value of the Msg parameter.

Return value

Type:

Type: LRESULT

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

Examples

For an example, see Designing a Window Procedure.

Requirements

Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Header	Winuser.h (include Windows.h)
Library	User32.lib
DLL	User32.dll
Unicode and ANSI names	DefWindowProcW (Unicode) and DefWindowProcA (ANSI)