MIDIOPENDESC

typedef struct midiopendesc_tag {
    HMIDI          hMidi;
    DWORD          dwCallback;
    DWORD          dwInstance;
    WORD           uReserved;    // reserved; do not use
    DWORD          dnDevNode;
    DWORD          cIds;
    MIDIOPENSTRMID rgIds;
} MIDIOPENDESC;
 

Contains information needed by a MIDI input or MIDI output device driver when devices are opened with a MODM_OPEN or MIDM_OPEN message.

Members

hMidi

Specifies the client's handle to the device, assigned by MMSYSTEM. Use this handle when notifying the client with the DriverCallback function.

dwCallback

Specifies either the address of a callback function, a window handle, or a task handle, depending on the flags specified in the dwParam2 parameter of the MODM_OPEN or MIDM_OPEN message. If this field contains a handle it is contained in the low-order word. The driver uses this information to notify the client using the DriverCallback function.

dwInstance

Specifies a DWORD of instance information for the client. This instance information is returned to the client whenever the driver notifies the client using the DriverCallback function.

dnDevNode

Specifies a device node for the device (if the device is Plug and Play).

cIds

Specifies the number of stream identifiers, if a stream is open.

rgIds

Specifies an array of device identifiers. The number of identifiers is given by the cIds member.

See Also

MIDIOPENSTRMID, MODM_OPEN, MIDM_OPEN