About Display Device Contexts
A display DC is a device context, created by Windows, that an application uses
to paint and draw a window. Windows prepares each display DC for output to a
window, setting the drawing objects, colors, and modes for the window instead of
for the display device. When the application supplies the display DC through
calls to GDI functions, GDI uses the information in the context to generate
output in the given window without intruding on other windows or other parts of the
screen.
Windows provides five kinds of display DC: common, class, parent, private, and
window. The common, class, and private DCs permit drawing in the client area
of a given window. The parent and window DCs permit drawing anywhere in the
window. Although the parent DC also permits drawing in the parent window, it is not
intended to be used in this way.
Windows supplies a common, class, parent, or private DC to a window based on
the type of display DC specified in that window's class style. Windows supplies
a window DC only when the application explicitly requests one
for example, by calling the
GetWindowDC or
GetDCEx function. In all cases, an application can use the
WindowFromDC function to determine which window a display DC currently represents.
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