From: Len Lawrence <lcl@...>
Date: 2007-01-22T06:15:08+09:00
Subject: Ruby Cookbook - problem recipe

Skipping through the Ruby Cookbook (Carlson & Richardson) I tried out the
rubyTk stopwatch program, which worked fine, then tried the GTK version.
I typed it in more or less verbatim but could not run it because the
menuspec which is given as an array (see below) could not be converted to
a string by the Gtk::ItemFactory create_items method.

Extract from the initialize method of the Stopwatch class:

    menu_factory = Gtk::ItemFactory.new( Gtk::ItemFactory::TYPE_MENU_BAR,
                                         '<main>', nil )
    menuspec = [
                 [
                   [ '_Program' ],
                   [ '/Program/_Start', '<Item>', nil, nil, lambda { start } ],
                   [ '/Program/S_top', '<Item>', nil, nil, lambda { stop } ],
                   [ '/Program/_Exit', '<Item>', nil, nil,
                     lambda { Gtk.main_quit } ]
                 ],
                 [
                   [ '_Reset' ],
                   [ '/Reset/_Reset Stopwatch', '<Item>', nil, nil,
                     lambda { reset } ]
                 ]
               ]

    menu_factory.create_items( menuspec )

The error message specifies the last line here as the problem.  Have I
missed something obvious?  The OReilly website lists errata for the book
but nothing for page 806 where this code snippet comes from.  Should I be
looking for version mismatches in GTK2 perhaps?

Len