释放 DC (设备上下文)。
ReleaseDC 只释放公共和窗口 DC，对类或私有 DC 不起作用。
另请参阅： win32gui.GetWindowDC
win32gui.ReleaseDC(hwnd, hDC)
int ReleaseDC( [in] HWND hWnd, [in] HDC hDC );
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