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waveOutProc

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A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

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

Header mmsystem.h
Library coredll.lib
Windows Embedded CE Windows CE 2.0 and later
Windows Mobile Windows Mobile Version 5.0 and later

See Also

Reference

Waveform Audio Functions