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 WM_CLOSE

The WM_CLOSE message is sent as a signal that a window or an application should terminate.

A window receives this message through its WindowProc function.

Parameters

• wParam
  This parameter is not used.
• lParam
  This parameter is not used.

Return Value

If an application processes this message, it should return zero.

Remarks

An application can prompt the user for confirmation, prior to destroying a window, by processing the WM_CLOSE message and calling the DestroyWindow function only if the user confirms the choice.

By default, the DefWindowProc function calls the DestroyWindow function to destroy the window.

Notification Requirements

• Minimum DLL Version None
• Header Declared in Winuser.h, include Windows.h
• Minimum operating systems Windows 95, Windows NT 3.1

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