static CWnd* PASCAL FromHandle( HWND hWnd );Return ValueReturns a pointer to a CWnd object when given a handle to a window. If a CWnd object is not attached to the handle, a temporary CWnd object is created and attached. The pointer may be temporary and should not be stored for later use.ParametershWndAn HWND of a Windows window.
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ReleaseDC(pDc);