In order to use these methods I introduced in trunk a class named Pointer. You allocate a Pointer object by using the #new_with_type method in which you pass the Objective-C type encoding.  @ is for pointers, i for integers, d for doubles, etc...

# This is not very intuitive, I will implement the RubyCocoa way to deal with pointers as well.

You use it like that:

    errorp = Pointer.new_with_type('@')

   urlData = NSURLConnection.sendSynchronousRequest(urlRequest, returningResponse:response, error:errorp)

   if urlData.nil?

     error = errorp[0]

     puts "error: #{error.description}"

  end