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