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This message is used in an MMDRV_MESSAGE_PARAMS structure passed to the WAV_IOControl function to request a waveform input driver to close a specified device instance previously opened with WIDM_OPEN.
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 ACM (Waveapi.dll) sends the WIDM_CLOSE message by calling the audio driver's (Wavedev.dll) WAV_IOControl entry point through the DeviceIoControl function.
If the driver has not filled and returned all the buffers received with WIDM_ADDBUFFER messages, it does not close the instance. Instead, it returns WAVERR_STILLPLAYING.
After the driver closes the device instance, it sends a WIM_CLOSE callback message to the ACM.
Requirements
OS Versions: Windows CE 1.0 and later.
Header: Mmddk.h.
See Also
Waveform Input Driver Messages | WAV_IOControl | MMDRV_MESSAGE_PARAMS
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