Hi Kenny,
Could you try to extract the image scaling code (which seems to cause the crash
if I read well) into a smaller program and see if you still have the problem?
A backtrace would be nice, otherwise. If your app crashes you might have a
crash log in ~/Library/Logs/CrashReporter for it.
Laurent
On Aug 11, 2010, at 1:43 PM, Kenny Lovrin wrote:
> Sure, here's the parts that I think is of value:
>
> Heres how my queue is defined:
>
> class MetadataDownloader
>
> @@queue = Dispatch::Queue.new("se.kennylovrin.test")
>
> class << self
>
> def fetch(id)
> downloader = new(id)
> @@queue.async do
> downloader.start
> end
> end
>
> end
>
> <more code here.....>
> end
>
> I use this by looping an array of integers, calling
> MetadataDownloader.fetch(var), hoping it will instantiate a new downloader
> and start it in the queue. :)
>
> Then, it does some work, connecting to some API's and downloading som data
> which contains a url to an image, that url is later passed into this instance
> method:
>
> def save_poster(url)
> stamp = Time.now.to_i
> save_path = File.join CoreDataManager.instance.app_support_dir,
> "posters", "#{stamp}.jpg"
> save_path_small = File.join
> CoreDataManager.instance.app_support_dir, "posters", "#{stamp}_small.jpg"
>
> fm = NSFileManager.defaultManager
> unless fm.fileExistsAtPath save_path
> error = Pointer.new_with_type "@"
> unless fm.createDirectoryAtPath
> save_path.stringByDeletingLastPathComponent,
> withIntermediateDirectories:true, attributes:nil, error:error
> NSLog "Failed to create dir for poster"
> return nil
> end
>
> img_data = NSData.dataWithContentsOfURL
> NSURL.URLWithString(url)
>
> if img_data && fm.createFileAtPath(save_path,
> contents:img_data, attributes:nil)
> NSLog "Fullsize poster saved"
> jpeg_data = rescaled_image img_data
> unless jpeg_data &&
> jpeg_data.writeToFile(save_path_small, atomically:true)
> NSLog "Failed to scale down poster at
> #{save_path_small}"
> return nil
> end
> NSLog "Small poster saved"
> else
> NSLog "Failed to save poster at #{save_path}"
> return nil
> end
>
> img_data = nil
> end
>
> save_path_small
> end
>
> which uses this instance method to do the scaling (this seems to be where the
> problem is):
>
> def rescaled_image(img_data)
> NSLog "Rescaling poster"
> NSLog "Calculating dimensions"
> img = CIImage.imageWithData img_data
> y_scale = 300 / img.extent.size.height
> x_scale = 200 / img.extent.size.width
> scale = [y_scale, x_scale].min
>
> NSLog "Setting up filter"
> scale_filter = CIFilter.filterWithName "CILanczosScaleTransform"
> scale_filter.setValue(NSNumber.numberWithFloat(scale),
> forKey:"inputScale")
> scale_filter.setValue(NSNumber.numberWithFloat(1.0),
> forKey:"inputAspectRatio")
> scale_filter.setValue(img, forKey:"inputImage")
>
> NSLog "Getting scaled image from filter"
> img = scale_filter.valueForKey "outputImage"
>
> NSLog "Create bitmap rep from image"
> rep = NSBitmapImageRep.alloc.initWithCIImage img
> NSLog "#{rep}"
> options = NSMutableDictionary.dictionaryWithObject
> NSNumber.numberWithFloat(0.85), forKey:NSImageCompressionFactor
> options.setValue(NSNumber.numberWithBool(true),
> forKey:NSImageProgressive)
>
> NSLog "Getting jpeg data from bitmap rep"
> jpeg_data = rep.representationUsingType NSJPEGFileType,
> properties:options
>
> NSLog "Rescale done, returning data"
> jpeg_data
> end
>
> As I said, it crashes randomly, but always at the line where it's trying t
> get the jpeg representation.. I'm pretty new to Cocoa so I there might be
> something stupod going on here.. ;) Everything works as expected if I do not
> try to do the image scaling..
>
> I think I am on MacRuby rev. 4407, but there is a risk I have done an update
> to rev 4407 but never built it.. I think that is what I have installed though.
>
> What do I need to do to get a proper crash log? :)
>
> Thanks a lot!
> Kenny
>
> On 11 August 2010 22:28, Thibault Martin-Lagardette <[email protected]>
> wrote:
> If it's small enough, and if you can, could you probably share the code with
> us? It might help us debug de problem.
> If you can't, we may need a little more than just that:
> - What version of MacRuby are you running?
> - Can you attach a crashlog?
>
> The more info, the better :-)
>
> --
> Thibault Martin-Lagardette
>
>
>
> On Aug 11, 2010, at 12:55, Kenny Lovrin wrote:
>
> > Hey guys
> >
> > I have a piece of code that runs in a background thread, and it crashes
> > randomly. I can't see any structure to the crashing, other than it always
> > seem to crash at the following line:
> >
> > jpeg_data = rep.representationUsingType NSJPEGFileType, properties:options
> >
> > Are there any known issues with this and macruby, or am I wrong somewhere
> > else? I tried running it both on the main thread and also by using sync
> > instead of async when i dispatch the thread to the queue, but it still
> > crashes randomly.
> >
> > I'm not entierly sure how to debug this, all I get in the log is an
> > EXC_BAD_ACCESS and then it stops in my editor at objc_msgSend.
> > Any ideas? :)
> >
> > PS. I need to rescale an image, if anyone know any other way that works in
> > a background thread please share. :)
> >
> > Thanks!
> > Kenny
> > _______________________________________________
> > MacRuby-devel mailing list
> > [email protected]
> > http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>
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