In this code sample: http://gist.github.com/41855 I am getting a Pointer instance instead of an NSManagedObject_Recipe instance (from Core Data). Subsequently the setValue:forKey: call at the end of the delegate/callback method fails. The top method addImage(sender) launches an NSOpenPanel, which delegates to the second/last method addImageSheetDidEnd:returnCode:contextInfo: when the panel is closed. But instead of passing through the NSManagedObject_Recipe instance to the contextInfo: recipe value, I am getting a Pointer. Is this correct? Or how do I get my NSManagedObject_Recipe instance from the Pointer. MacRuby src for Pointer class doesn't suggest it has any methods for getting the pointed-to thing. rb_cPointer = rb_define_class("Pointer", rb_cObject); rb_undef_alloc_func(rb_cPointer); rb_define_singleton_method(rb_cPointer, "new_with_type", rb_pointer_new_with_type, 1); rb_define_method(rb_cPointer, "assign", rb_pointer_assign, 1); rb_define_method(rb_cPointer, "[]", rb_pointer_aref, 1); Cheers Nic -- Dr Nic Williams iPhone and Rails consultants - http://mocra.com Fun with iPhone/Ruby/Rails/Javascript - http://drnicwilliams.com * Surf Report for iPhone - http://mocra.com/projects/surfreport/ *