Windows in charge of graphics output is GDI (ie Graphic Device Interface, Graphics Device Interface). This is not related to Windows and hardware graphics output mode of the embodiment. GDI based on hardware abstraction layer (HAL) on top of different shielding difference between the output device, providing users with a unified standard output device. However, with the DOS different, Windows is a multi-task, the process of independence, each window should have an independent output channels. This, GDI also uses a simple mechanism to ensure the drawing in the window between the different procedures to share the equipment and non-interfering. This mechanism is the DC (Device Context, device description table).

MFC Window程序设计（第二版）精华浓缩笔记(二).doc

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