Re: [Rubycocoa-talk] Bus error CFRelease on CGImageSourceRef - no clues?

[Duncan M. <du...@on...>]

On 7 Jul 2009, at 00:01, Scott Thompson wrote:

> Ok.  If it's not the garbage collector, how about an autorelease
> pool.  Surround your code in the loop with a local autorelease pool
> and see if there might be some objective c objects hanging around
> longer that you want them to.

I really appreciate you sticking around once again Scott. Before my  
original post I had tried a pool, and I had tried CFRelease, and I had  
tried GC - but it turns out that I hadn't tried a pool _and_ CFRelease  
_and_ GC in the same loop. It works!

I can't claim to understand why this works (or why more sensible  
solutions don't), but I post it here for posterity.

def test_dispose_CGImageSource
	# All of draining the pool, releasing the image and the GC are  
required if this is not to leak
	1.upto(10000) do |i|
		p i
		pool = NSAutoreleasePool.new
		imageSource =  
CGImageSourceCreateWithURL(NSURL.fileURLWithPath('testdata/pot pourri/ 
blood.jpg'), nil)
		image = CGImageSourceCreateImageAtIndex(imageSource, 0, nil)
		CFRelease image
		# CFRelease imageSource - can't as will segfault
		pool.drain
		ObjectSpace.garbage_collect
	end
end

I suspect that the explicit GC is required here for whatever reason it  
is required in my other post re disposing NSImage - in a hard  
RubyCocoa loop the GC doesn't seem to be triggered.

Thanks again for keeping me believing that there is a way!

Duncan