Derived from CDC.
class CWindowDC : public CDC
Constructs a CWindowDC object.
The HWND to which this CWindowDC is attached.
Calls the Windows functions GetWindowDC at construction time and ReleaseDC at destruction time. This means that a CWindowDC object accesses the entire screen area of a CWnd (both client and nonclient areas).
For more information on using CWindowDC, see Device Contexts.