waveOutProc 11XYXE0

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 waveOutOpen2MUO.P_ function.

void CALLBACK waveOutProc(

HWAVEOUT hwo,
UINT uMsg,
DWORD dwInstance,
DWORD dwParam1,
DWORD dwParam2
);

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_CLOSEN5GWL6

Sent when the device is closed using the waveOutClose11Z3QHJ function.

WOM_DONE6S45R9

Sent when the device driver is finished with a data block sent using the waveOutWrite12C9KIJ function.

WOM_OPENT1K65R

Sent when the device is opened using the waveOutOpen2MUO.P_ 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.