Share via

WODM_GETEXTDEVCAPS (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 return the extended capabilities of a specified device.

Parameters

  • uDeviceId
    Device identifier - 0, 1, 2, and so on - for the target device.
  • uMsg
    Specifies this message.
  • dwUser
    Specifies a device instance identifier.
  • dwParam2
    Specifies the size, in bytes, of WAVEOUTEXTCAPS.

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 this message by calling the audio driver's WAV_IOControl entry point through the DeviceIoControl function. Unlike other waveform driver messages, this message does not correspond to a waveform services function. Waveform output drivers that support multiple streams must handle this message and report the number of streams that can be opened at the same time.

Requirements

Header

mmddk.h

See Also

Reference

Waveform Output Driver Messages
WAV_IOControl
MMDRV_MESSAGE_PARAMS
WAVEOUTEXTCAPS