MODM_GETDEVCAPS

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.