# Re: Qt4 not supported?

**URL:** <https://www.ruby-forum.com/t/re-qt4-not-supported/168435>\
**Category:** Ruby\
**Created:** [May 20, 2009, 7:47pm UTC](https://www.ruby-forum.com/t/re-qt4-not-supported/168435 "2009-05-20T19:47:17Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![jolivierld](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/34f0e0/32.png) [@jolivierld](https://www.ruby-forum.com/u/jolivierld)\
**Post date:** [May 20, 2009, 7:47pm UTC](https://www.ruby-forum.com/t/re-qt4-not-supported/168435/1 "2009-05-20T19:47:17Z")

</div>

hello,

I have made a little change :

* * *

require (‘Qt’)

class Fen\_princ \< Qt::MainWindow

def initialize  
zone\_centrale=Qt::Widget.new  
nom=Qt::LineEdit.new  
layout=Qt::FormLayout.new  
layout.addRow(“Votre nom :”,nom)  
zone\_centrale.setLayout(layout)  
self.setCentralWidget(zone\_centrale)

end

end

app=Qt::Application.new(ARGV)  
fenetre=Fen\_princ.new()  
fenetre.show  
app.exec

* * *

and I have then this error :

* * *

C:/Users/lolveley/Documents/Visual Studio  
2008/Projects/test\_qt\_central\_widget/test\_qt\_central\_widget/rubyfile.rb:11:in  
`method_missing': Instance is not initialized, cannot call setCentralWidget (ArgumentError) from C:/Users/lolveley/Documents/Visual Studio 2008/Projects/test_qt_central_widget/test_qt_central_widget/rubyfile.rb:11:in `initialize’  
from  
c:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10-mswin32/lib/Qt/qtruby4.rb:2398:in  
`call' from c:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10-mswin32/lib/Qt/qtruby4.rb:2398:in `try\_initialize’  
from  
c:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10-mswin32/lib/Qt/qtruby4.rb:2397:in  
`catch' from c:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10-mswin32/lib/Qt/qtruby4.rb:2397:in `try\_initialize’  
from C:/Users/lolveley/Documents/Visual Studio  
2008/Projects/test\_qt\_central\_widget/test\_qt\_central\_widget/rubyfile.rb:19:in  
`new’  
from C:/Users/lolveley/Documents/Visual Studio  
2008/Projects/test\_qt\_central\_widget/test\_qt\_central\_widget/rubyfile.rb:19

* * *

lolveley.

* * *

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---

<div class="post-metadata">

**Author:** ![jolivierld](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/34f0e0/32.png) [@jolivierld](https://www.ruby-forum.com/u/jolivierld)\
**Post date:** [May 20, 2009, 9:07pm UTC](https://www.ruby-forum.com/t/re-qt4-not-supported/168435/2 "2009-05-20T21:07:13Z")

</div>

Stop!

I have found the error : a “super” was miussing in the head of  
initialize.

olivier.

> ```
> zone_centrale=Qt::Widget.new
> 
> ```
> 
> C:/Users/lolveley/Documents/Visual Studio  
> c:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10-mswin32/lib/Qt/qtruby4.rb:2398:in  
> from C:/Users/lolveley/Documents/Visual Studio  
> 2008/Projects/test\_qt\_central\_widget/test\_qt\_central\_widget/rubyfile.rb:19
> 
> * * *
> 
> lolveley.

* * *

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