Tk::Error: ("after" script)

wulvrine has asked for the wisdom of the Perl Monks concerning the following question:

Hello fellow monks

I am writing a Perl::Tk program which is throwing an error Tk::Error: ("after" script) when it is exiting. During the main loop of the program, there is a DialogBox called. This box has an 'exit' button.

my $dlg=$mw->DialogBox(-title=>'Winner',
                       -buttons=>["Again","Exit"]);
my $b=$dlg->Show();
if ($b eq "Again") {
   ...
} else {
  $mw->destroy(); 
  exit;
}
[download]

When the "Exit" button is pressed, $mw->destroy(); is called. The program then prints
Tk::Error:
("after" script)

What does this error really mean, and how do I get rid of this error?
Thanks!

s&&VALKYRIE &&& print $_^q|!4 =+;' *|

Comment on Tk::Error: ("after" script) Download Code

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Re: Tk::Error: ("after" script) by zentara (Cardinal) on Sep 27, 2007 at 16:30 UTC
Hi, I can't reproduce your error, it seems to run Ok here, but it probably depends on system load and timing, (and maybe Tk version). I did see similar problems in the past, and from my experience, your problem is in "$mw->destroy". Why? Well your DialogBox is a child of $mw, and if you destroy $mw, you destroy the MainLoop (event loop) and leave the $dlg hanging in mid-air. It is better to use Tk::exit ( or even plain exit), to exit a Tk program. Tk::exit will clean up after itself. General rule: Don't use $mw->destroy unless you are trying to continue the script in a non-Tk mode. I'm not really a human, but I play one on earth. Cogito ergo sum a bum	[reply]
Re: Tk::Error: ("after" script) by liverpole (Monsignor) on Sep 27, 2007 at 16:00 UTC
Hi wulvrine, As I mentioned to you, I've seen this exact same error from one or two perl/Tk programs of my own, but I've never figured out exactly what the cause was. My recollection is that it was intermittent; sometimes it happened and sometimes not. I'll be very curious to see whether others have had this happen, and especially if someone knows the answer to this. s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/	[reply]
Re: Tk::Error: ("after" script) by wulvrine (Friar) on Sep 28, 2007 at 18:38 UTC
zentara Thanks for the ideas! I think it has to do with having the dialog box up at all. If I display the dialog box and then use Tk::exit or just plain exit the program doesnt stop, the Tk window closes, but the 'repeat' loop keeps running and I still get the errors. However, if I do not display a dialog box and just plain exit, it works fine. Is there something special that needs to be done once a dialog box is shown to properly exit? s&&VALKYRIE &&& print $_^q\|!4 =+;' *\|	[reply]