Scrolling a Bitmap with the WM_CREATE Message
When the
WM_CREATE message is processed, the variables required for scrolling are initialized.
Use the
CreateCompatibleDC function to create a compatible device context (DC), the
CreateBitmap function to create a bitmap, and the
SelectObject function to select the bitmap for the DC. Note that a compatible DC is also
known as a memory DC.
The device-specific information about the display device is retrieved. If a
compatible DC is created for the screen, as in the example, use the
GetDeviceCaps function to get this information. The information includes the number of
adjacent color bits per pixel, the number of color planes, and the height and width
of the DC.
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