Re: Bizarre copy of ARRAY in leave at ...

Not that it helps much but it crashes for me as well (Perl 5.8 on Win XP):

Tk::Error: Can't set -variable to `SCALAR(0x18299b4)' for Tk::ProgressBar=HASH(0
x4e044f4): Bizarre copy of ARRAY in leave at C:/Perl/site/lib/Tk/Trace.pm line 8
9.
 at C:/Perl/site/lib/Tk/Derived.pm line 294
 Tk callback for event
 Tk callback for .
 Tk callback for .progressbar
 Tk::Derived::configure at C:/Perl/site/lib/Tk/Derived.pm line 306
 Tk::Widget::new at C:/Perl/site/lib/Tk/Widget.pm line 205
 Tk::Widget::__ANON__C:/Perl/site/lib/Tk/Widget.pm:256 at C:/Perl/site/lib/Tk/
Widget.pm line 256
Can't set -variable to `SCALAR(0x18299b4)' for Tk::ProgressBar=HASH(0x4e044f4):
Bizarre copy of ARRAY in leave at C:/Perl/site/lib/Tk/Trace.pm line 89.
 at C:/Perl/site/lib/Tk/Derived.pm line 294

 at C:/Perl/site/lib/Tk/Derived.pm line 306
 error:Bizarre copy of ARRAY in leave at C:/Perl/site/lib/Tk/Trace.pm line 89.

Comment on Re: Bizarre copy of ARRAY in leave at ...

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Re^2: Bizarre copy of ARRAY in leave at ... by mnooning (Beadle) on Apr 07, 2005 at 01:42 UTC
I was able to get the thing to at least run ... until I hit the Exit or Go buttons. The problem seems to be that the ProgressBar code works with undefined items, and just ignores the errors, while the debugger does not ignore them. The case in point is ProgressBar::variable I will paste the original, that crashes in the debugger, and my fix. sub variable { my $c = shift; my $oldvarref = $c->{'-variable'}; my $oldval = $$oldvarref if $oldvarref; if(@_) { my $varref = shift; if ($oldvarref) { $c->traceVdelete($oldvarref); } $c->{'-variable'} = $varref; $c->traceVariable($varref, 'w', sub { $c->value($_[1]) }); $$varref = $oldval; _layoutRequest($c,2); } $oldval; } <\code> <br> Here is the fix<br> <br> <code> sub variable { my $c = shift; my $oldvarref = ""; my $oldval = ""; if (defined($c->{'-variable'})) { $oldvarref = $c->{'-variable'}; $oldval = $$oldvarref if $oldvarref; } if(@_) { my $varref = shift; $c->traceVdelete($oldvarref) if (defined($oldvarref) and ($oldvarref ne "")); $c->{'-variable'} = $varref; $c->traceVariable($varref, 'w', sub { $c->value([1]) }); $$varref = $oldval if (defined($oldval) and ($oldval ne "")); _layoutRequest($c,2); } return ($oldval) if (defined($oldval) and ($oldval ne "")); } [download] This took way to long for me to find. Now I have a worse problem (again, only in the debugger). It runs in that it pops up the progress bar, but when I click on either Exit or Go, it bombs. I have traced it down to Tk::MainLoop where it does DoOneEvent(0); but I cannot trace from there. I am getting very nervous that Tk may have such unprotected undefined items sprinkled about. That would spell doom for anyone wanting to use Tk ... and be able to use the Perl debugger. Someone ... please say it isn't so! Thanks	[reply] [d/l]

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Re^2: Bizarre copy of ARRAY in leave at ...
by mnooning (Beadle) on Apr 07, 2005 at 01:42 UTC

sub variable {
    my $c = shift;
    my $oldvarref = $c->{'-variable'};
    my $oldval = $$oldvarref if $oldvarref;
    if(@_) {
    my $varref = shift;
        if ($oldvarref)
         {
      $c->traceVdelete($oldvarref);
         }
    $c->{'-variable'} = $varref;
    $c->traceVariable($varref, 'w', sub { $c->value($_[1]) });
    $$varref = $oldval;
    _layoutRequest($c,2);
    }
    $oldval;
}
<\code>
<br>
Here is the fix<br>
<br>
<code>

sub variable {
    my $c = shift;
    my $oldvarref = "";
    my $oldval = "";
    if (defined($c->{'-variable'})) {
      $oldvarref = $c->{'-variable'};
      $oldval = $$oldvarref if $oldvarref;
    }

    if(@_) {
        my $varref = shift;
        $c->traceVdelete($oldvarref) 
             if (defined($oldvarref) and ($oldvarref ne ""));

        $c->{'-variable'} = $varref;
        $c->traceVariable($varref, 'w', sub { $c->value([1]) });

        $$varref = $oldval if (defined($oldval) and ($oldval ne ""));

        _layoutRequest($c,2);
    }
    return ($oldval) if (defined($oldval) and ($oldval ne ""));
}
[download]

[reply]
[d/l]