WIDM_GETNUMDEVS (Windows CE 5.0)
This message is used in an MMDRV_MESSAGE_PARAMS structure passed to the WAV_IOControl function to request a waveform input 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 input device instances it supports. The default audio driver's MDD layer returns 1.
Remarks
The ACM sends this message by calling the audio driver's WAV_IOControl entry point through the DeviceIoControl function.
Requirements
OS Versions: Windows CE 1.0 and later.
Header: Mmddk.h.
See Also
Waveform Input Driver Messages | MMDRV_MESSAGE_PARAMS | WAV_IOControl
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