The WIDM_GETDEVCAPS message requests a waveform input driver to return the capabilities of a specified device.
Parameters
uDeviceId
Device identifier (0, 1, 2, and so on) for the target device.
uMsg
WIDM_GETDEVCAPS
dwUser
Device instance identifier.
dwParam1
Pointer to a WAVEINCAPS structure. (The WAVEINCAPS structure is described in the Win32 SDK.)
dwParam2
Size of the WAVEINCAPS structure in bytes.
Return Value
The driver should return MMSYSERR_NOERROR if the operation succeeds. Otherwise it should return one of the MMSYSERR or WAVERR error codes defined in mmsystem.h. See waveInGetDevCaps return values in the Win32 SDK.
Comments
A client sends the WIDM_GETDEVCAPS message by calling the user-mode driver's widMessage entry point, passing the specified parameters.
Typically, the user-mode driver calls DeviceIoControl to send the kernel-mode driver an IOCTL_WAVE_GET_CAPABILITIES control code.
The user-mode driver fills the WAVEINCAPS structure.