Wxruby and rubygems seems not to work?

ruby-talk
1

Like here: http://wxruby.rubyforge.org/wiki/wiki.pl?Installation suggested I installed wxruby2 on my linux machine with:
  sudo gem install wxruby2-preview
Then I tried this sample: http://wxruby.rubyforge.org/wiki/wiki.pl?Getting_Started , I modified it to run for me:

#!/usr/bin/env ruby

$Verbose=true

require 'rubygems'
gem 'wxruby2-preview'

class MinimalApp < App
    def on_init
         Frame.new(nil, -1, "The Bare Minimum").show()
    end
end

MinimalApp.new.main_loop

but always when I execute it I'm getting this error:
laptop:~/Desktop$ ./gui.rb
./gui.rb:9: uninitialized constant App (NameError)
laptop:~/Desktop$

My machine is an Ubuntu feisty fawn and
gem: 0.9.0
ruby: 1.8.5 (2006-08-25) [i486-linux]
wxruby2-preview: 0.0.40 .

What did I wrong?!? Can someone point me to my mistake? Is there a difference between wxruby2-preview and wxruby2? But there is no wxruby2 gem just this -preview one?

bye

···

--
kazaam <kazaam@oleco.net>

2

kazaam wrote:

Like here: http://wxruby.rubyforge.org/wiki/wiki.pl?Installation suggested I installed wxruby2 on my linux machine with:
  sudo gem install wxruby2-preview
Then I tried this sample: http://wxruby.rubyforge.org/wiki/wiki.pl?Getting_Started , I modified it to run for me:

#!/usr/bin/env ruby

$Verbose=true

require 'rubygems'
gem 'wxruby2-preview'

class MinimalApp < App
    def on_init
         Frame.new(nil, -1, "The Bare Minimum").show()
    end
end

MinimalApp.new.main_loop

but always when I execute it I'm getting this error:
laptop:~/Desktop$ ./gui.rb
./gui.rb:9: uninitialized constant App (NameError)
laptop:~/Desktop$

You missed two lines of the tutorial:

require "wx" # wxruby2
include Wx

they should be placed below your require "rubygems"

If you leave out 'include Wx' you will have to write Wx::App, Wx::Frame etc.

Stefan

3

gem doesn't require any files, you need to call require for that.

The only time you need to call gem is when you want a specific version of a gem.

No matter what, you must call require.

···

On Aug 22, 2007, at 09:20, kazaam wrote:

Like here: http://wxruby.rubyforge.org/wiki/wiki.pl?Installation suggested I installed wxruby2 on my linux machine with:
  sudo gem install wxruby2-preview
Then I tried this sample: http://wxruby.rubyforge.org/wiki/wiki.pl?Getting_Started , I modified it to run for me:

#!/usr/bin/env ruby

$Verbose=true

require 'rubygems'
gem 'wxruby2-preview'

class MinimalApp < App

--
Poor workers blame their tools. Good workers build better tools. The
best workers get their tools to do the work for them. -- Syndicate Wars

4

kazaam wrote:

require 'rubygems'
gem 'wxruby2-preview'

class MinimalApp < App

the error is here.

./gui.rb:9: uninitialized constant App (NameError)
laptop:~/Desktop$

You have chopped out a bit too much from the sample you copied. The class you want to inherit from is Wx::App, so you need to either reference it fully:

  class MinimalApp < Wx::App

or, include the whole Wx module in your main namespace at the beginning of your script (as in the sample you started from):

  include Wx

Then you don't have to add the Wx:: prefix whenever you reference a wxRuby class or other constant. The choice is yours; "include" saves a bit of typing in short scripts, but it's probably clearer to use the Wx:: prefix in bigger applications.

ruby: 1.8.5 (2006-08-25) [i486-linux]
wxruby2-preview: 0.0.40 .

Not relevant to your error, but I'd recommend upgrading to wxruby-1.9.0, which is a newer, beta-quality release off the wxruby2-preview series.

alex

5

okay I'm a bit further. I found out that this here:

#!/usr/bin/env ruby

$Verbose=true

require 'wx'
include Wx

class MinimalApp < App
    def on_init
         Frame.new(nil, -1, "The Bare Minimum").show()
    end
end

MinimalApp.new.main_loop

Works perfectly if I start it with "ruby -rubygems gui.rb" but I can't get it to run if I wanna start it simple with ./gui.rb ?!? Also if I include:
require 'rubygems'
it refuses to work... that's really weired?!?

···

--
kazaam <kazaam@oleco.net>

6

thx with:
require 'rubygems'
require 'wx'

include Wx

it works fine :slight_smile:

···

--
kazaam <kazaam@oleco.net>

7

kazaam schrieb:

okay I'm a bit further. I found out that this here:

#!/usr/bin/env ruby

$Verbose=true

require 'wx'
include Wx

class MinimalApp < App
    def on_init
         Frame.new(nil, -1, "The Bare Minimum").show()
    end
end

MinimalApp.new.main_loop

Works perfectly if I start it with "ruby -rubygems gui.rb" but I can't get it to run if I wanna start it simple with ./gui.rb ?!? Also if I include:
require 'rubygems'
it refuses to work... that's really weired?!?

Can you show the error message? If it is "permission denied" you'd have
to change the file permission to executable.

Make sure that you include a shebang line in your gui.rb

Running ruby -rrubygems should be equal to having 'require "rubygems"'
in your file.

Stefan