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The WM_SIZECLIPBOARD message is sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and the clipboard viewer’s client area has changed size.


hwndViewer = (HWND) wParam;  // handle of clipboard viewer window 

hglbRc = (HGLOBAL) lParam;   // handle of RECT object 



Value of wParam. Identifies the clipboard viewer window.
Value of lParam. Identifies a global memory object that contains a RECT structure. The structure specifies the new dimensions of the clipboard viewer’s client area.


When the clipboard viewer window is about to be destroyed or resized, a WM_SIZECLIPBOARD message is sent with a null rectangle (0, 0, 0, 0) as the new size. This permits the clipboard owner to free its display resources.

The clipboard owner must use the GlobalLock function to lock the memory object that contains RECT. Before returning, the clipboard owner must unlock the object by using the GlobalUnlock function.

See Also

GlobalLock, GlobalUnlock, RECT 

file: /Techref/os/win/api/win32/mess/src/msg28_2.htm, 1KB, , updated: 2000/4/7 12:20, local time: 2022/5/27 04:50,

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