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WODM_BREAKLOOP (Compact 2013)

  • Article

3/26/2014

This message is used in an MMDRV_MESSAGE_PARAMS structure passed to the WAV_IOControl function to request a waveform output driver to break an output loop that was created with a WODM_WRITE message.

Parameters

  • uDeviceId
    Device identifier - 0, 1, 2, and so on - for the target device.
  • uMsg
    Specifies this message.
  • dwUser
    Specifies a device instance identifier.
  • dwParam1
    Not used.
  • dwParam2
    Not used.

Return Values

MMSYSERR_NOERROR indicates success. Otherwise, the driver returns one of the MMSYSERR or WAVERR error values declared in the Mmsystem.h header file.

Remarks

The waveform API manager sends the WODM_BREAKLOOP message by calling the audio driver's WAV_IOControl entry point through the DeviceIoControl function.

The driver should stop output of the loop buffers at the end of the next loop iteration.

If the driver receives this message and a loop is not in progress, it returns MMSYSERR_NOERROR.

Requirements

Header

mmddk.h

See Also

Reference

Waveform Output Driver Messages
WAV_IOControl
MMDRV_MESSAGE_PARAMS