You can write your own callback function to process messages sent by the
device driver. To use a callback function, specify the CALLBACK_FUNCTION flag in the
fdwOpen parameter and the address of the callback in the
dwCallback parameter of the
waveInOpen or
waveOutOpen function.
Messages sent to a callback function are similar to messages sent to a window,
except they have two
DWORD parameters instead of a
UINT and a
DWORD parameter. For details on these messages, see
Playing Waveform-Audio Files.
To pass instance data from an application to a callback function, use one of
the following techniques:
- Pass the instance data using the dwInstance parameter of the function that opens the device driver.
- Pass the instance data using the dwUser member of the WAVEHDR structure that identifies an audio data block being sent to a device driver.
If you need more than 32 bits of instance data, pass a pointer to a structure
containing the additional information.
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