# (windows 7,visual studio,ruby in steel) Qt4 not supported?

**URL:** <https://www.ruby-forum.com/t/windows-7-visual-studio-ruby-in-steel-qt4-not-supported/168414>\
**Category:** Ruby\
**Created:** [May 20, 2009, 4:48pm UTC](https://www.ruby-forum.com/t/windows-7-visual-studio-ruby-in-steel-qt4-not-supported/168414 "2009-05-20T16:48:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**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, 4:48pm UTC](https://www.ruby-forum.com/t/windows-7-visual-studio-ruby-in-steel-qt4-not-supported/168414/1 "2009-05-20T16:48:31Z")

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hello,

I want to use visual studio 2008 + ruby in steel (plugin ruby), and I  
would like to create a simple program (containing \_ say \_ a QMainWindow  
containing a QLineEdit.)  
the first statement of my program is : print require ‘Qt4’ and it  
returns “true”, so I thought Qt4 was supported (I don’t remember if I  
installed some particular stuff (apart Qt4) in order to use Qt4 with  
ruby (I mean qt4-qtruby, or korumdum).

but Qt4 is not actually supported : I have this error (at the line :  
class Fen\_princ \< QMainWindow) : “uninitialized constant QMainWindow”…

do you know if there are some libraries to add to the project?

or an other IDE to use on window and which supports Qt4?

olivier.

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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, 6:08pm UTC](https://www.ruby-forum.com/t/windows-7-visual-studio-ruby-in-steel-qt4-not-supported/168414/2 "2009-05-20T18:08:57Z")

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On Wed, 20 May 2009 23:47:44 +0900, lolveley wrote:

> but Qt4 is not actually supported : I have this error (at the line :  
> class Fen\_princ \< QMainWindow) : “uninitialized constant QMainWindow”…
> 
> do you know if there are some libraries to add to the project?
> 
> or an other IDE to use on window and which supports Qt4?
> 
> olivier.

You’ve got the right library, but you have the naming convention for  
classes in QtRuby wrong. While the C++ version uses names like  
QMainWindow, the Qt version puts them in their own module, so you need  
to  
convert the name to Qt::MainWindow

–Ken