Memory Device Contexts
Windows supports a memory device context that stores bitmapped images for a
particular device. An application creates a memory device context by calling the
CreateCompatibleDC function and supplying a handle that identifies a device context for a
particular device. When Windows processes this call, it creates a bitmap having a
color format compatible with the original device. Because the bitmap is compatible
with the given device, a memory device context is also sometimes referred to
as a
compatible device context.
The original bitmap in a memory device context is simply a placeholder. Its
dimensions are one pixel by one pixel. Before an application can begin drawing,
it must select a bitmap with the appropriate width and height into the device
context by calling the
SelectObject function. Once the new bitmap is selected into the memory device context, an
application can begin using the device context to store images. For more
information about bitmaps and bitmap operations, see
Bitmaps.
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