Re: [Rubycocoa-talk] problems when "require"-ing libraries or gems

[Gregory C. <gr...@in...>]

Hi Steve,

You might need a require 'rubygems' before the require 'rexml/ 
document'. Certainly that's true for Builder. I've used REXML in my  
latest RubyCocoa projects, along with other gems, and require  
'rubygems' is my first line.

Hope this helps,
Greg


> Dear all,
>
> I'm using RubyCocoa 0.13.2 on OS X 10.5.4
>
> I have a problem that is driving me batty. I was originally trying  
> to use XmlBuilder to write out some XML. However, at seemingly  
> random places, my application would crash while building the XML and  
> jump into the debugger, always at objc_msgSend.
>
> Well, I thought perhaps there might be some strange problem with  
> XmlBuilder so I decided to try using REXML instead. Well now I get  
> the problem immediately. The following code works perfectly from the  
> command line using /usr/bin/ruby which points to /System/Library/ 
> Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby
>
> require 'osx/cocoa'
> require 'rexml/document'
>
> doc = REXML::Document.new
> node = REXML::Element.new( "node")
> doc.add_element node
> puts "#{doc.to_s}"
>
> In fact, there's no particular reason to include 'osx/cocoa' as it  
> stands because I deleted everything down to the simplest terms.  
> Originally, I had objects that knew how to write themselves to XML.
>
> However, if I run the following code as part of an XCode project for  
> a Cocoa application:
>
> require 'osx/cocoa'
> require 'rexml/document'
>
> class AppController < OSX::NSObject
> 	include OSX
>
> 	# big cut of other methods
>
> 	def exportModel
> 		return if @modelAlias.selectedObjects.length < 1
> 		model = @modelAlias.selectedObjects[ 0]
>
> #		panel = NSSavePanel.savePanel
> #		return if panel.runModalForDirectory_file( nil, "model.xml") !=  
> NSFileHandlingPanelOKButton
>
> #		filename = NSString.stringWithString panel.filename
>
> 		doc = REXML::Document.new
> 		node = REXML::Element.new( "node")
> 		doc.add_element node
> 		NSLog( "#{doc.to_s}")
> 	end
> 	ib_action :exportModel
> end
>
> The application barely runs. It starts up but when I attempt to load  
> a model into the application, the application crashes and goes  
> immediately into the debugger (dbg) without any other information  
> about what might have gone wrong. I assume it crashes on openModels  
> (and not exportModel) because it is the first time that  
> AppController is interpreted.
>
> Here are the first 30 lines from the backtrace:
>
> #0  0x946ef6e8 in objc_msgSend ()
> #1  0x0002fab4 in rbobj_to_nsobj ()
> #2  0x0002d327 in objcptr_s_new_with_cptr ()
> #3  0x000dc1d8 in rb_eval_string_wrap ()
> #4  0x000dcdec in rb_eval_string_wrap ()
> #5  0x000da06d in rb_eval_string_wrap ()
> #6  0x000db17c in rb_eval_string_wrap ()
> #7  0x000db1c5 in rb_eval_string_wrap ()
> #8  0x000dc9de in rb_eval_string_wrap ()
> #9  0x000e641e in rb_apply ()
> #10 0x000dc323 in rb_eval_string_wrap ()
> #11 0x000dcdec in rb_eval_string_wrap ()
> #12 0x000dd871 in rb_respond_to ()
> #13 0x000dd95a in rb_funcall ()
> #14 0x00104a55 in rb_inspect ()
> #15 0x00035bca in rbobj_call_ruby ()
> #16 0x00034db6 in install_ovmix_hooks ()
> #17 0x000331ef in ovmix_register_ruby_method ()
> #18 0x9030e9aa in ___forwarding___ ()
> #19 0x9030ea12 in __forwarding_prep_0___ ()
> #20 0x00033319 in ovmix_register_ruby_method ()
> #21 0x9584a69b in _NSGetUsingKeyValueGetter ()
> #22 0x9584a1aa in -[NSObject(NSKeyValueCoding) valueForKey:] ()
> #23 0x95878192 in -[NSArray(NSKeyValueCoding) valueForKey:] ()
> #24 0x95877d2a in -[NSObject(NSKeyValueCoding) valueForKeyPath:] ()
> #25 0x958c3548 in -[NSArray(NSKeyValueCoding) valueForKeyPath:] ()
> #26 0x95877c90 in -[NSObject(NSKeyValueCoding) valueForKeyPath:] ()
> #27 0x95118cd4 in -[NSBinder  
> _valueForKeyPath:ofObject:mode:raisesForNotApplicableKeys:] ()
> #28 0x951188dc in -[NSBinder  
> valueForBinding:resolveMarkersToPlaceholders:] ()
> #29 0x951f2b29 in -[NSSelectionBinder  
> _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState 
> :] ()
> #30 0x9514d950 in -[NSValueBinder  
> _observeValueForKeyPath:ofObject:context:] ()
>
> Note that it is not enough to comment out the REXML lines, to make  
> everything run fine. I have to comment out the require 'rexml/ 
> document' line as well...then everything will run fine....but REXML  
> is in the Ruby standard library. I can cd to /System/Library/ 
> Frameworks/Ruby.framework/Versions/Current/usr/lib/ruby/1.8/rexml/  
> and see that document.rb is there.
>
> Any ideas?
>
> Cheers,
> Steve
>
>
>
>
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