I have a several hundred line Perl/Tk program with a subroutine (timedDialog) that opens a window with a message such as “starting backup”, “creating tar file”, “finished”, etc. and then the window closes after a few seconds. This all works fine, but when I try to use this sub to display an “exiting” message after the user hits a cancel button the script exits before the message displays. This seems to be because of the “exit(0)” statement immediately following it—I tried putting “sleep 5” in between, but that didn’t help.

The following demonstrates my problem. If the exit statement in sub checkDays is commented out the message is displayed, if it is uncommented you never see the message. Can someone please tell me what I am doing wrong?

#!/usr/bin/perl
######################################################################
+##
use strict;
use warnings;
use Tk;

my $mw = MainWindow -> new;
my $timedDialogTitle = '';
my $timedDialogText = '';
my $svBtn = undef; #Option window SAVE button.

&setupGUI;
$mw->deiconify();
$mw->raise(); 
MainLoop;
exit(0);

################################################
################################################

sub setupGUI{
    $timedDialogTitle = "STARTING BACKUP";
    $timedDialogText = "Backing up files...";

    $svBtn = $mw->Button( -text => "SAVE", -command => sub {&checkDays
+; &timedDialog($timedDialogTitle, $timedDialogText, 5_000);});

    $svBtn->grid(-row => 9, -column => 2, -sticky => 'e');

    $mw->bind('<KeyPress-Return>' => sub {&checkDays; &timedDialog($ti
+medDialogTitle, $timedDialogText, 5_000);});

    $mw-> withdraw();

}
#####################################

sub checkDays {
                &timedDialog("Exiting", "O.K., no backup will be made,
+ then....Exiting", 5_000);
                exit(0);
    }
#####################################

sub timedDialog
{
my $subwindow = MainWindow->new;
    $subwindow->geometry("490x150+400+400"); 
    $subwindow->title($_[0]);
my $label = $subwindow->Label(-text => $_[1]);
$label->pack;
$subwindow->after($_[2], sub {$subwindow->destroy;});
}
#####################################

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In reply to Perl/Tk and exit(0) by saw55

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