[MacRuby-devel] Out parameters with MacRuby

[rebotfc]

errorp = Pointer.new_with_type("@")

result = NSXMLDocument.alloc.initWithData(data,  
options:NSXMLDocumentValidate, error:errorp)

# access error
errorp[0]


On 26 Apr 2009, at 16:36, Alex Vollmer wrote:

> 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
> ----
> Musings & Notes — http://alexvollmer.com
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