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Using a Window to Process Driver Messages
The easiest type of callback function to use to process driver messages is a
window callback. To use a window callback, specify the CALLBACK_WINDOW flag in
the dwFlags parameter and a window handle as the dwCallback parameter of the device-opening function. Driver messages will be sent to the
window-procedure function for the window identified by the handle in dwCallback.
Messages sent to the window function are specific to the audio device type
used.
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