Re: MusicEventIteratorHasNextEvent
Re: MusicEventIteratorHasNextEvent
- Subject: Re: MusicEventIteratorHasNextEvent
- From: Philippe Wicker <email@hidden>
- Date: Thu, 23 Oct 2003 21:32:59 +0200
On Thursday, October 23, 2003, at 06:35 PM, Craig Bakalian wrote:
>
Hi,
>
I am trying to get access to the events placed in a MusicTrack of a
>
MusicSequence. Is there example code of this somewhere? I am kinda
>
old for iterators, I normally pop a "for" or "while" loop on something
>
and get the data that way. I have always stayed away from those new
>
fangled iterator objects.
Here is how I do it (C++ code). If you plan to test it in a C or objC
program you will have to change some little things such as replacing
C++ references (e.g. RawEventInfos& ) by "standard" pointers
(RawEventInfos*).
struct RawEventInfos {
MusicTimeStamp time;
MusicEventType type;
UInt32 size;
void* data;
};
OSStatus GetEventInfos(MusicEventIterator the_iterator,
RawEventInfos& inf)
{
return MusicEventIteratorGetEventInfo (the_iterator, &inf.time,
&inf.type, (const void**) &inf.data, &inf.size );
}
void WalkthroughMusicTrack(MusicTrack the_track)
{
OSStatus status;
int event_count = 0;
MusicEventIterator the_iterator;
// Should add some error checking code here
NewMusicEventIterator(the_track, &the_iterator);
MusicEventIteratorSeek(the_iterator, 0);
while (1) {
RawEventInfos event_infos ;
status = GetEventInfos (the_iterator, event_infos);
if (status == noErr) { /* --> Your code here */ }
else if (status == kAudioToolboxErr_EndOfTrack) /* OK , End of
track */ break;
else /* KO, unexpected error, should not happen */ break;
MusicEventIteratorNextEvent(the_iterator);
}
DisposeMusicEventIterator(the_iterator);
return status;
}
>
>
Craig Bakalian
>
www.eThinkingCap.com
>
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>
Philippe Wicker
email@hidden
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