RubyMotion Queue Pointer?

gistfile1.txt

queue = Dispatch::Queue.new "com.helloresolven.booth.queue"
output.setSampleBufferDelegate self, queue:queue

yields...

2012-05-04 12:53:14.275 booth[91714:10703] *** Terminating app due to uncaught exception 'TypeError', reason: 'capture_view_controller.rb:44:in `setup_session': expected instance of Pointer, got `com.helloresolven.booth.queue' (Dispatch::Queue) (TypeError)
	from capture_view_controller.rb:9:in `viewDidLoad'

queue = Dispatch::Queue.new "com.helloresolven.booth.queue"
ptr = Pointer.new(:object)
ptr[0] = queue
output.setSampleBufferDelegate self, queue:ptr

yields...

2012-05-04 12:55:22.920 booth[91825:10703] *** Terminating app due to uncaught exception 'TypeError', reason: 'capture_view_controller.rb:46:in `setup_session': expected instance of Pointer of type `{dispatch_queue_s=}', got `@' (TypeError)
	from capture_view_controller.rb:9:in `viewDidLoad'
'


queue = Dispatch::Queue.new "com.helloresolven.booth.queue"
ptr = Pointer.new('{dispatch_queue_s=}')
ptr[0] = queue
output.setSampleBufferDelegate self, queue:ptr

yields...

Can't find pointer description for type `{dispatch_queue_s=}'

Thanks!