How do I determine if a window is off-screen?

Question

In Windows XP and above, given a window handle (HWND), how can I tell if the window position and size leaves the window irretrievably off screen? For example, if the title

Answer 1

Visibility check is really easy.

RECT rtDesktop, rtView;

GetWindowRect( GetDesktopWindow(), &rtDesktop );
GetWindowRect( m_hWnd, &rtView );

HRGN rgn = CreateRectRgn( rtDesktop.left, rtDesktop.top, rtDesktop.right, rtDesktop.bottom );

BOOL viewIsVisible = RectInRegion( rgn, &rtView );

DeleteObject(rgn);

You don't have to use RectInRegion, I used for shorten code.

Display, resolution change monitoring is also easy if you handle WM_SETTINGCHANGE message.

http://msdn.microsoft.com/en-us/library/ms725497(v=vs.85).aspx

UPDATE

As @Cody Gray noted, I think WM_DISPLAYCHANGE is more appropriate than WM_SETTINGCHANGE. But MFC 9.0 library make use of WM_SETTINGCHANGE.