From: "Hal E. Fulton" <hal9000@...>
Date: 2002-03-27T04:20:30+09:00
Subject: Re: Error calling Tk in a loop

----- Original Message -----
From: <james@rubyxml.com>
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>
Sent: Tuesday, March 26, 2002 12:46 PM
Subject: Error calling Tk in a loop


> I'm trying to write some code that pops up a Tk window when for certain
> events.
>
> The first call to display works, but the next one gives this error:
> C:/Ruby/lib/ruby/1.6/tk.rb:986:in `_invoke': can't invoke "label" command:
> application has been destroyed (RuntimeError)
>
> The Ruby version is ruby 1.6.6 (2001-12-26) [i586-mswin32]
> This is on a Win2K box. I haven't installed any other Tcl/Tk but what came
> with the Ruby installation.
> I get the same error on my Linux box using Ruby 1.6.7.
>
> Any ides on what causes this, and how to avoid it?

Hmm... I tried adding a Quit button, then using a thread
(for mainloop) or a continuation. Neither worked for me.

I think I may be on the right track with the button, though...
it sometimes seems to me that hitting the X does not
terminate the app completely gracefully.

Is there a call that will terminate the mainloop?

Side note: If you are Windows-only, you might consider
using the WIN32OLE trick to throw up a message box.
See the Coral Book, chapter 8.

Sorry can't help... interesting issue, though.

Hal Fulton