Function MusicEventIteratorHasPreviousEvent 

pub unsafe extern "C-unwind" fn MusicEventIteratorHasPreviousEvent(
    in_iterator: MusicEventIterator,
    out_has_prev_event: NonNull<u8>,
) -> i32

Available on crate feature MusicPlayer only.

Does the track have an event previous to the event the iterator is pointing to?

To use the iterator going backwards through a track: iter = New Iterator (points at first event) MusicEventIteratorSeek (iter, kMusicTimeStamp_EndOfTrack) // will point it past the last event bool hasPreviousEvent; MusicEventIteratorHasPreviousEvent (iter, &hasPreviousEvent ) while (hasPreviousEvent) { MusicEventIteratorPreviousEvent (iter) // do work… MusicEventIteratorGetEventInfo (iter, …

MusicEventIteratorHasPreviousEvent (iter, &hasPreviousEvent ); }

Parameter inIterator: the iterator

Parameter outHasPrevEvent: true if there is a previous event, false if not

Safety

• in_iterator must be a valid pointer.
• out_has_prev_event must be a valid pointer.