From: Hidetoshi NAGAI <nagai@...>
Date: 2004-10-07T00:41:35+09:00
Subject: Re: quality of error messages

Hi, 

From: Joachim Wuttke <Joachim_Wuttke@ph.tum.de>
Subject: quality of error messages
Date: Wed, 6 Oct 2004 22:48:49 +0900
Message-ID: <Pine.OSF.3.95.1041006144909.11973B-100000@eva.e13.physik.tu-muenchen.de>
>    Once I open a Ruby/Tk session, error messages are
> redirected to an annoying popup window. Can I disable
> this behavior ? I would prefer to see errors in stdout,
> even when I am running a GUI.

Please use TkBgError.set_handler.
For example, 
------------------------------------------------------------------------
  require 'tk'

  TkButton.new(:text=>'raise error', 
               :command=>proc{raise 'baaaaar'}).pack(:fill=>:x)

  TkButton.new(:text=>'set bgerror', 
               :command=>proc{
                  STDERR.print("call TkBgError.set_handler\n")
                  TkBgError.set_handler{|msg|
                    STDERR.puts(msg)
                    STDERR.puts(Tk.tk_call('set', '::errorInfo'))
                  }
               }).pack(:fill=>:x)

  Tk.mainloop
------------------------------------------------------------------------
After pressing the second button, you'll get error messages in stderr.
-- 
                                  Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)