WM_MDIDESTROY

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 to child to close 
lParam = 0;                         // not used; must be zero 
 

Parameters

hwndChild

Value of wParam. Handle to 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, the system restores the active child window and maximizes the newly activated child window.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.

See Also

Multiple Document Interface Overview, Multiple Document Interface Messages, WM_MDICREATE