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WM_MDIDESTROY Overview  Group

An application sends the WM_MDIDESTROY message to a multiple document interface (MDI) client window to close an MDI child window. 

WM_MDIDESTROY 

wParam = (WPARAM) (HWND) hwndChild; // handle of child to close 

lParam = 0;                         // not used; must be zero 

 

Parameters

hwndChild
Value of wParam. Identifies the MDI child window to be closed.

Return Values

This message always returns zero.

Remarks

This message removes the title of the MDI child window from the MDI frame window and deactivates the child window. An application should use this message to close all MDI child windows.

If an MDI client window receives a message that changes the activation of its child windows and the active MDI child window is maximized, Windows restores the active child window and maximizes the newly activated child window.

See Also

WM_MDICREATE 

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