次の方法で共有

WODM_GETNUMDEVS (Compact 2013)

  • [アーティクル]

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 number of device instances that it supports.

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

The driver returns the number of waveform output device instances it supports. For Windows Embedded Compact, the default MDD returns 1.

Remarks

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

Requirements

Header

mmddk.h

See Also

Reference

Waveform Output Driver Messages
WAV_IOControl
MMDRV_MESSAGE_PARAMS