WM_CLOSE message
Sent as a signal that a window or an application should terminate.
A window receives this message through its WindowProc function.
#define WM_CLOSE 0x0010
-
wParam
-
This parameter is not used.
-
lParam
-
This parameter is not used.
Type: LRESULT
If an application processes this message, it should return zero.
LRESULT CALLBACK WindowProc(
__in HWND hWindow,
__in UINT uMsg,
__in WPARAM wParam,
__in LPARAM lParam)
{
switch (uMsg)
{
case WM_CLOSE:
DestroyWindow(hWindow);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWindow, uMsg, wParam, lParam);
}
return 0;
}
Example from Windows Classic Samples on GitHub.
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.
Requirement | Value |
---|---|
Minimum supported client |
Windows 2000 Professional [desktop apps only] |
Minimum supported server |
Windows 2000 Server [desktop apps only] |
Header |
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Reference
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Conceptual