Problem with StringList object in Ruby/Qt4

ruby-talk
1

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

2

Alle martedì 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

3

Stefano Crocco wrote:

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()

That seems to be it. Thank you, Srefano!

Rosie