Apple

The problem seems to be that MusicSequenceNewTrack returns immediately and if you try to call MusicSequenceFileCreate right after it, the track will not be added to the file. If, instead you wait, let’s say 1 second and then call it, the track will be added to the file. Now, what’s strange is that calling CAShow on the sequence actually shows the track, even if you do it right after adding it. So, the track is there and it’s accessible, I can’t see why, MusicSequenceFileCreate doesn’t work.

Does anybody have any idea on how I can handle this, except for waiting for a certain amount of time before calling the create file function?

On 12 Dec 2014, at 03:07, Valentin Radu <email@hidden> wrote:

Hi everybody,

I’m trying to save a sequence to disk but it seems MusicSequenceFileCreate doesn’t work for some reason. In the code below, there is no error thrown, however, when doing a CAShow on the testSequence, I can see it's not the same as the old sequence, all the tracks are missing. The only, let’s say odd, thing about the tracks is that they have a user event with some data at timestamp 0. Did anyone encountered issue this before? Any pointers on why this is happening? Is is a bug?

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
   NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *midiPath = [documentsDirectory
stringByAppendingPathComponent:@"test.mid"];
NSURL* url = "" style="font-variant-ligatures: no-common-ligatures; color: #c35900" class="">NSURL alloc] initFileURLWithPath:midiPath];

VRC(MusicSequenceFileCreate(sequence, (__bridge CFURLRef)url, kMusicSequenceFile_MIDIType, kMusicSequenceFileFlags_EraseFile, 0));

MusicSequence testSequence;
VRC(NewMusicSequence(&testSequence));
VRC(MusicSequenceFileLoad(testSequence, (__bridge CFURLRef)url, kMusicSequenceFile_MIDIType, 0));

Valentin Radu
codewisesystems.com
cocoaexposed.com

Valentin Radu
codewisesystems.com
cocoaexposed.com

References:
	>MusicSequenceFileCreate fails to save tracks (From: Valentin Radu <email@hidden>)