Now let's create a memory device context and select a new bitmap.

现在，让我们创建一个内存设备上下文，然后选择一个新的位图。

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You can supply a handle to a file-mapping object that the function will use to create the bitmap, or you can let the system allocate the memory for the bitmap.

可传一个文件映射对象的句柄来创始位图。或者让系统为位图分配内存。

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