XStoSubCmd: Not a Tk Window Tk::die_with_trace at /perl_install/lib/Tk/Submethods.pm line 37

Tk::MainWindow=HASH(0xa56e270) is not a widget

I run this with $window->Label(-text=>"Hello 1")->pack(); and then $window->Label(-text=>"Hello 2")->pack(); to print bothe Hello 1 and 2 in the same window, but I get errors on second run.

use Tk;
use Tk::Widget;
#use Tk::WidgetDump;
use Data::Dumper;
use Storable;
use B::Deparse;
$Storable::Deparse=1;
use Storable qw(freeze thaw);
use Safe;
#use strict;
my $safe = new Safe;

# because of opcodes used in "use strict":
$safe->permit(qw(:default require));
local $Storable::Deparse = 1;
local $Storable::Eval = sub { $safe->reval($_[0]) };

sub ShowLog {
 my $window;
 if(-e "mainwindow.store") {$window=retrieve("mainwindow.store");}
 if(!defined($window)) {$window = Tk::MainWindow->new();}
  if(defined($window)) {
  $window->Label(-text=>"Hello 1")->pack();
  store \%{$window}, "mainwindow.store";
 }
 MainLoop();
}
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with trial and error , 300+ google clicks etc makes me a bit tierd. I want to give up but then quite sure this cannot be that difficult to do, but could be i am making it difficult ? help?

It seems you can't simply freeze a Tk window, its XS foundations don't survive. Just save a structure with all the important values, and let the script populate the window with the values if they exist.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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Um, I ... suggest coffee or a walk or something

#!/usr/bin/perl --
use strict;
use warnings;
use Path::Tiny qw/ path /;
use Tk;
GoTk( @ARGV );
exit( 0 );
sub GoTk {
    my( $file ) = @_;
    my %vars  = (
        pack  => [qw/ -expand 1 -fill both /],
        label => 'the label '.gmtime. ' ',
        text  => 'the text  '.gmtime. ' ',
        LoadSaved( $file ), 
    );
    my $mw = tkinit;
    $mw->Label( -text => $vars{label} )->pack( @{ $vars{pack} } );
    $mw->Entry( -text => $vars{text} )->pack( @{ $vars{pack} } );
    $mw->protocol('WM_DELETE_WINDOW',
    sub {
        eval {
            SaveLoaded(
                $file, {
                    %vars,
                    label => Chaild($mw, 'label')->cget(-text),
                    text  => Chaild($mw, 'Entry')->cget(-text),
            });
        1 } or warn $@;
        Tk::exit;
    });
    $mw->MainLoop;
}
sub Chaild {
    my( $w, $class ) = @_;
    for my $kid ( $w->children ){
        return $kid if ref($kid) =~ /\Q$class\E/i;
    }
    return;
}
sub SaveLoaded {
    my( $file , $vars ) = @_;
    path( $file )->spew_raw(
        map {
            my $k = $_;
            my $v = $vars->{$k};
            $v = sprintf "qw' %s '", join ' ' , @$v if ref $v;
            "$k=$v\n"
        } keys %$vars
    );
}
sub LoadSaved {
    my %stuff;
    local $@;
    for my $line ( eval { path(@_)->lines_raw   } ){
        $line =~ s/[\r\n]+$//;
        my( $key, $val ) = split /=/, $line, 2;
        next unless $key and $val;
        $val = [split ' ', $1] if $val =~ m{qw'(.*)'};
        $stuff{$key}=$val;
    }
    warn $@ if $@;
    return %stuff;
}
__END__
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:P ...guru, awake now :)

Thanks. That was super rapid!

I ran GoTk.pm. I do a small change in $mw->Entry, then I close the first $mw, I reran and I saw the text change in the secondly created window. (understood that I closed the first mainwindow to save changes to the $file !)

My need is, when I re-run, I should 'add' new tab to a notebook in first opened $mw itself. My need is not saving values from the first $mw on WM_DELETE_WINDOW event but updating the existing mainwindow.

any chance for this ?

if this is not possible, then is it possible to trigger a timer kind of thing from the GUI itself to check for updates on a file (at regular interval) and when the file is updated with a new line, the GUI adds a new tab.

...

So I understood that there is no chance to reuse my previously created window. dumb question: is it not possible to save "Tk::MainWindow=HASH(0xa1eeed8)" like this to a file and re-create the window handler in next run?

Use Tk::WidgetDump, it uses ->configure/->cget/->children and a few other methods to introspect widgets (get their settings properties sizes bindings configuration colors text values data ...)

Thats how you "save" a window to disk, you dump all its ocnfiguration and data ... and later you "load" it from disk ... you use ->configure/->cget/->children.....