Are you sure you're retaining your particles dictionary so its not being
autoreleased? I can't see where you've created it so cannot be certain. This
sort of mistake often causes these sorts of crashes (works initially, doesn't
shortly after).
An easier and probably safer approach would be to just set your outputParticles
property directly to a new dictionary that you create each time, rather than
trying to maintain one mutable object over time, and then having to retain it,
etc.
And finally, to answer your source comment, no they're not the same - the first
one changes the contents of your self.outputParticles dictionary to match those
of particles. The second one assigns (depending on your @property declaration)
the object directly to the property, which is what you're wanting.
Try this:
NSMutableDictionary* particles = [NSMutableDictionary dictionary];
for(int i=0;i<self.inputAmount;i++){
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
[NSString stringWithFormat:@"%i", rand()], @"x",
[NSString stringWithFormat:@"%i", rand()], @"y",
[NSString stringWithFormat:@"%i", rand()], @"z",
[NSString stringWithFormat:@"%i", rand()], @"random value",
nil];
[particles setObject:dictionary forKey:[NSString
stringWithFormat:@"%i",i]];
}
self.outputParticles = particles;
Best,
A.
On 28 Sep 2010, at 10:57, Stefan Kainbacher, NEON GOLDEN wrote:
>
> hello together,
>
> i would like to build a plugin that has one input (number) and an output
> (structure).
>
> if i change the the number on the input it should give me a a dictionary or
> array with n=inputNumber elements. it works the first time and hands out the
> structure in qc, but when i change the input qc crashes. whats wrong? what do
> i miss?
>
>
> - (BOOL) execute:(id<QCPlugInContext>)context atTime:(NSTimeInterval)time
> withArguments:(NSDictionary*)arguments
> {
>
> NSLog(@"Amount: %i", self.inputAmount);
> //[particles removeAllObjects];
>
> for(int i=0;i<self.inputAmount;i++){
>
> NSDictionary *dictionary = [NSDictionary
> dictionaryWithObjectsAndKeys:
>
> [NSString stringWithFormat:@"%i", rand()], @"x",
>
> [NSString stringWithFormat:@"%i", rand()], @"y",
>
> [NSString stringWithFormat:@"%i", rand()], @"z",
>
> [NSString stringWithFormat:@"%i", rand()], @"random value",
> nil];
> [particles setObject:dictionary forKey:[NSString
> stringWithFormat:@"%i",i]];
> }
>
> [self.outputParticles setDictionary:particles]; // BTW: IS THIS THE
> SAME? self.outputParticles = particles;
>
> return YES;
> }
>
>
> full source download (2.5 mb) available here:
>
> http://dl.dropbox.com/u/950822/Quartz%20Composer/NG%20ParticleSystem%2001.zip
>
>
> cheers, stefan
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