waveOutProc (Compact 2013)

3/26/2014

This 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.

Syntax

void CALLBACK waveOutProc(
  HWAVEOUT hwo,
  UINT uMsg,
  DWORD dwInstance,
  DWORD dwParam1,
  DWORD dwParam2
);

Parameters

• hwo
  Handle to the waveform-audio device associated with the callback.

• uMsg
  Waveform-audio output message. It can be one of the following values.

  Message	Description
  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 parameter.

• dwParam2
  Message parameter.

Return Value

None.

Remarks

Applications should not call any system-defined functions from inside a callback function, except for EnterCriticalSection, LeaveCriticalSection, OutputDebugString, PostMessage, PostThreadMessage, and SetEvent. Calling other wave functions will cause deadlock.

Requirements

See Also

Reference

Waveform Audio Functions