Releases the handle to the device context.

释放设备上下文的句柄。

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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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Later on, you deselect the pen object from the device context and destroy the object.

稍后，你从关联设备取消画笔对象并销毁该对象。

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Later on, you deselect the pen object from the device context and destroy the object.

稍后，你从关联设备取消画笔对象并销毁该对象。

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