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WM_SIZECLIPBOARD Overview  Group

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. 

WM_SIZECLIPBOARD 

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

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

 

Parameters

hwndViewer
Value of wParam. Identifies the clipboard viewer window.
hglbRc
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.

Remarks

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 

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