From: Stefano Crocco <stefano.crocco@...>
Date: 2008-01-16T05:59:25+09:00
Subject: Re: Problem with StringList object in Ruby/Qt4

Alle marted́ 15 gennaio 2008, Rosalind Mitchell ha scritto:
> I'm experimenting with building Ruby applications with Qt4 GUI interfaces.
>
> While most of it is going easily - I like using Qt4 more than most GUI
> tools - I seem to have run into a problem with Qt::StringList objects.
>
> I can reduce this to a bare minimum script that produces the exception:
>
> -----------------------------------------------------------------------
> #!/usr/bin/ruby -wKU
>
> require 'Qt4'
>
> class ListForm < Qt::Widget
>   def initialize
>     super()
>
>     model = Qt::StringListModel.new()
>     list = Qt::StringList.new()
>
>   end
> end
>
> app = Qt::Application.new(ARGV)
>
> test_form = ListForm.new()
> test_form.show()
>
> app.exec()
> -----------------------------------------------------------------------
>
> When I run this, the output is:
>
> $ ruby slist.rb
> slist.rb:10:in `const_missing': uninitialized constant Qt::StringList
> (NameError)
>         from slist.rb:10:in `initialize'
>         from slist.rb:19:in `new'
>         from slist.rb:19
> -----------------------------------------------------------------------
>
> I'm sure I'm missing something simple here, I just can't see what.  Any
> thoughts?
>
> Oh yes: Ruby 1.8.6 / Qt 4.3 / Ubuntu 7.10
>
> Rosie

I think this happens because QtRuby uses ruby lists instead of most (if not 
all) of the Qt containers. Try doing

list =  []

instead of 

list = Qt::StringList.new()

Stefano