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waveOutProc
The waveOutProc function is the callback function used with the waveform-audio output device.
The waveOutProc function is a placeholder for the application-defined function name. The
address of this function can be specified in the callback-address parameter of the waveOutOpen function.
- oid CALLBACK waveOutProc(
HWAVEOUT hwo,
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| UINT uMsg,
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| DWORD dwInstance,
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| DWORD dwParam1,
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| DWORD dwParam2
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| );
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Parameters
hwo
Handle of the waveform-audio device associated with the callback.
uMsg
Waveform-audio output message. It can be one of the following values:
WOM_CLOSE
Sent when the device is closed using the waveOutClose function.
WOM_DONE
Sent when the device driver is finished with a data block sent using the waveOutWrite function.
WOM_OPEN
Sent when the device is opened using the waveOutOpen function.
dwInstance
User-instance data specified with waveOutOpen.
dwParam1
Message parameters.
dwParam2
Message parameters.
Return Values
This function does not return a value.
Remarks
Applications should not call any system-defined functions from inside a
callback function, except for EnterCriticalSection, LeaveCriticalSection, midiOutLongMsg, midiOutShortMsg, OutputDebugString, PostMessage, PostThreadMessage, SetEvent, timeGetSystemTime, timeGetTime, timeKillEvent, and timeSetEvent. Calling other wave functions will cause deadlock.
See Also
EnterCriticalSection, LeaveCriticalSection, midiOutLongMsg, midiOutShortMsg, OutputDebugString, PostMessage, PostThreadMessage, SetEvent, timeGetSystemTime, timeGetTime, timeKillEvent, timeSetEvent, waveOutClose, waveOutOpen, waveOutWrite, WOM_CLOSE, WOM_DONE, WOM_OPEN
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