I'm looking for any! information about ruby and QT

anansi · July 12, 2007, 5:57pm

Hi,
I tried it severaly times now but always failed. I want to make a ruby
application that uses QT but I’m lacking information about it. I’m never
succeding in getting that to work what I did. I know there is a ebook
for 10$ but I really don’t have the money and I’m no professional coder
but a hobby coder.
So I wondered can anybody point me to free information about it ?

I know these links and the ones linked in them:

http://developer.kde.org/language-bindings/ruby/index.html

If someone is itself familiar with ruby and qt maybe you can help me?
I generated with qt4-designer this rss.ui:
http://nopaste.php-q.net/309650 and converted it with rbuic to this
rss.rb: http://nopaste.php-q.net/309649

Now I try to show this Qt-window with that code:

#!/usr/bin/qtrubyinit
require ‘/home/myuser/Desktop/rss.rb’

class RssShow < MainWindow
def initialize(app)
super()
@app = app
end
end

create and show dialog

if $0 == FILE
app = Qt::Application.new(ARGV)
dialog = RssShow.new(app)
app.mainWidget = dialog
dialog.show
app.exec
end

but it always fails and gives me that error:
$ ./rss-show.rb
/home/myuser/Desktop/rss.rb:15:in const_missing': uninitialized constant MainWindow::WType_TopLevel (NameError) from /home/myuser/Desktop/rss.rb:15:in initialize’
from ./rss-show.rb:6:in initialize' from /usr/lib/ruby/1.8/Qt/qtruby.rb:1682:in call’
from /usr/lib/ruby/1.8/Qt/qtruby.rb:1682:in try_initialize' from /usr/lib/ruby/1.8/Qt/qtruby.rb:1681:in catch’
from /usr/lib/ruby/1.8/Qt/qtruby.rb:1681:in try_initialize' from ./rss-show.rb:14:in new’
from ./rss-show.rb:14

Does anybody know why? Or can point me to further information about ruby
and Qt?

–
greets

                 one must still have chaos in oneself to be able to

give birth to a dancing star

anansi · July 12, 2007, 6:14pm

If someone is itself familiar with ruby and qt maybe you can help me?

You are mixing Qt versions, and that won’t work. The UIC file you
generated came
from Qt 4, but the Qtruby stuff that you’re working with looks to be for
Qt 3.
You’ll need to pick one version or the other and stick with it from both
the Qt side
and the QtRuby side.

Caleb

anansi · July 12, 2007, 9:36pm

On 7/12/07, anansi [email protected] wrote:

Hi,
I tried it severaly times now but always failed. I want to make a ruby
application that uses QT but I’m lacking information about it. I’m never
succeding in getting that to work what I did. I know there is a ebook
for 10$ but I really don’t have the money and I’m no professional coder
but a hobby coder.
Sorry for some lobbying here, but maybe it helps.
What about Ruby Gnome2/GTK it is so well documented, or is it Qt for
some special reason? in that case please ignore this as noise on the
wire …
http://ruby-gnome2.sourceforge.jp/

Cheers
Robert

anansi · July 13, 2007, 1:45pm

Alle giovedì 12 luglio 2007, anansi ha scritto:

Ruby Howto: Graphical User Interface
Now I try to show this Qt-window with that code:

but it always fails and gives me that error:
from ./rss-show.rb:14

Does anybody know why? Or can point me to further information about ruby
and Qt?

Qt is well documented. There’s the qt reference
(http://doc.trolltech.com/4.3/index.html), which, while witten for C++,
can
be translated to ruby almost directly. Besides, in the qtruby
distribution
(http://rubyforge.org/projects/korundum), there are a lot of example
written
in ruby (they’re the ports to ruby of the C++ examples provided with
Qt). The
examples include the tutorial described in the qt documentation
(http://doc.trolltech.com/4.3/examples.html#qt-tutorial).

I hope this helps

Stefano

anansi · July 13, 2007, 1:48pm

Alle venerdì 13 luglio 2007, Stefano C. ha scritto:

Stefano

I forgot, the examples are located in the ruby/qtruby/examples directory
in
the qtruby source directory.

Stefano

anansi · July 13, 2007, 7:11pm

Caleb T. wrote:

If someone is itself familiar with ruby and qt maybe you can help me?

You are mixing Qt versions, and that won’t work. The UIC file you generated came
from Qt 4, but the Qtruby stuff that you’re working with looks to be for Qt 3.
You’ll need to pick one version or the other and stick with it from both the Qt side
and the QtRuby side.

Caleb

Hi yes I did the ui file with qt4-designer but what do you mean with
qtruby stuff? I just wanna use qt4 but where can I check which is used
by ruby? I have qt4 installed!

@steffano: thanks for these links! I’ckeck them soon as this versioning
problem is solved.

@robert: I heard a lot of good things about qt so I wanna work with it a
bit

Does anybody know how I can check that just qt4 is used?

I’m working under ubuntu linux.

–
greets

                 one must still have chaos in oneself to be able to

give birth to a dancing star

anansi · July 13, 2007, 7:24pm

Hi yes I did the ui file with qt4-designer but what do you mean with
qtruby stuff? I just wanna use qt4 but where can I check which is used
by ruby? I have qt4 installed!

I can tell just by looking at the .rb file you generated when you ran
“rbuic”. On
my system (which is not ubuntu, so it may be different), the one for Qt4
is called
“rbuic4”, and it generates a completely different type of output. The
ui stuff
between Qt3 and Qt4 changed dramatically, and my guess is that whatever
tutorial or
information you’re using is geared for Qt3.

But the fact that you have both sets of qtruby toolkits installed will
probably lead
to confusion. I would get rid of the qtruby for Qt3 if you want to
stick with the
Qt4 version. You can fire up irb to find out what you’re using:

tc@tc12 ~/test $ irb
irb(main):001:0> require ‘Qt’
Q=> true
irb(main):002:0> Qt::version
=> “3.3.6”

tc@tc12 ~/test $ irb
irb(main):001:0> require ‘Qt4’
Qt=> true
irb(main):003:0> Qt::version
=> “4.3.0”

anansi · July 13, 2007, 10:10pm

On 7/13/07, anansi [email protected] wrote:

Caleb T. wrote:

@steffano: thanks for these links! I’ckeck them soon as this versioning
problem is solved.

@robert: I heard a lot of good things about qt so I wanna work with it a
bit
Sure I did some lobbying because it was not completely clear what you
wanted and I thought it might be helpful…
Stefano firmly defended QT and that got you somewhere I hope.
I do not think at all that QT is bad and I did not say so (scusami
Stefano se avessi dato 'sta impressione), I have no idea how it
integrates with Ruby, let us know more about it will you?

Cheers
Robert

anansi · September 25, 2007, 11:04pm

anansi wrote:

It’s a ruby bug which makes it impossible

A Ubuntu bug I meant, no ruby bug…

–
greets

                 one must still have chaos in oneself to be able to

give birth to a dancing star

anansi · July 15, 2007, 12:32pm

I got out what the mistake is. It’s a ruby bug which makes it impossible
to install libqt4-ruby and rbuic for qt4 at the same time:

So I had qt3 and qt4 mixed… I need to wait for a fix of these packages
now.

Caleb T. wrote:

Hi yes I did the ui file with qt4-designer but what do you mean with
qtruby stuff? I just wanna use qt4 but where can I check which is used
by ruby? I have qt4 installed!

–
greets

                 one must still have chaos in oneself to be able to

give birth to a dancing star