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From: zazula@soliton.uucp (Ralph Zazula)
Newsgroups: comp.sys.next
Subject: Bug in MusickKit????? (ScorePerformer)
Message-ID: <1991Jun11.112010.781@arizona.edu>
Date: 11 Jun 91 18:20:09 GMT
Distribution: world,local
Organization: University of Arizona, Tucson AZ
Lines: 57
Nntp-Posting-Host: soliton.physics.arizona.edu

I was having a bunch of problems with the setScore: method of
the ScorePerformer class.  It seems that the PartPerformers of
the ScorePerformer DO NOT get updated if you do a setScore: with
a modified version of a previously used score.  For example :

	id	myScore;
	id	myScorePerformer;

	myScore = [[Score alloc] init];
	myScorePerformer = [[ScorePerformer alloc] init];

	[myScore readMidifile:"file_with_2_parts.midi"];
	[myScorePerformer setScore:myScore];

	// ... play the score ...

	[myScore readMidifile:"file_with_5_parts.midi"];
	[myScorePerformer setScore:myScore];

Now, I look in AppInspector and see that the PartPerformer list for
myScorePerformer still only has 2 parts in it, NOT 5.  The setScore:
method says: " The PartPerformers from a previously set Score (if any)
are first removed and freed.".  

It seems like I have 2 options, free the Score every time _or_ free
the ScorePerformer every time (I've tried the latter). Okay, I just
tried manually freeing all of the PartPerformers ie.

	[myScorePerformer freePartPerformers];

instead of:
	
	[myScorePerformer free];
	myScorePerformer = [[ScorePerformer alloc] init]; // again...

This worked too.

So, does this make sense?  It appears that the above quote only applies
to a new Score *instance* instead of a new Score (in the music sense).

This is bad!  One shouldn't have to free the ScorePerformer instance
just to register an update in the Score!!!!!!!!!!!!!!! 

Well, I only wasted about 6 hours on this...  I should have gotten 
AppInspector out much earlier...  It's in my dock now :-)

 
Ralph

   |----------------------------------------------------------------------|
   | Ralph Zazula                               "Computer Addict!"        |
   | University of Arizona                 ---  Department of Physics     |
   |   UAZHEP::ZAZULA                            (DecNet/HEPNet)          |
   |   zazula@uazhe0.physics.arizona.edu         (Internet)               |
   |----------------------------------------------------------------------|
   |   "You can twist perceptions, reality won't budge."  - Neil Peart    |
   |----------------------------------------------------------------------|