GDI output functions can be used with a memory device context only if a bitmap has been created and selected into that context.

GDI的输出函数只有当内存设备环境上有了位图画布之后，才能进行输出。

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To enable applications to place output in memory rather than sending it to an actual device, use a special device context for bitmap operations called a memory device context.

要使程序能输出到内存中，而不是实际的设备上，使用操作位图的特殊设备环境，称之为内存设备环境。

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Creates a memory-device context that is compatible with another device context. You can use it to prepare images in memory.

创建内存设备上下文，与另一个设备上下文匹配。可以用它在内存中准备图像。

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Creates a memory-device context that is compatible with another device context. You can use it to prepare images in memory.

创建内存设备上下文，与另一个设备上下文匹配。可以用它在内存中准备图像。

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