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MIDIOPENDESC
 
        This structure contains information needed by a MIDI input or
        MIDI output device driver when devices are opened with a
        MODM_OPEN or MIDM_OPEN message.
 
        typedef struct midiopendesc_tag {
            HANDLE hMidi;
            DWORD dwCallback;
            DWORD dwInstance;
        } MIDIOPENDESC;
 
Fields
        HANDLE hMidi
            Specifies the client's handle to the device, assigned by
            MMSYSTEM. Use this handle when notifying the client with
            the DriverCallback function.
 
        DWORD 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.
 
        DWORD 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.
 
See also
        MODM_OPEN, MIDM_OPEN
 
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