[MacRuby-devel] Out parameters with MacRuby

[Alex Vollmer]

Is it possible to use "out" parameters with MacRuby, such as NSError?  
In my particular case I'd like to capture errors that result from  
parsing XML with NSXMLDocument using the initWithData:options:error:  
method. I tried (naively) just instantiating an NSError instance and  
handing it to that method, but ended up with this:

irb(main):037:0> e = NSError.new
=> #<NSError:0x80067cc40>
irb(main):038:0> doc = NSXMLDocument.alloc.initWithData(data,  
options:NSXMLDocumentValidate, error:e)
ArgumentError: can't convert Ruby object `#<NSError:0x80067cc40>' to  
Objective-C value of type `^@'
	from (irb):38:in `initWithData:options:error:'
	from (irb):38
	from /usr/local/bin/macirb:12:in `<main>'

Any help or insight is appreciated.

Cheers,

Alex
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