Hello!

I wrote following code (filename is clipboard.pl):

#!/usr/bin/env perl
use strict;
use warnings;
use diagnostics;
use feature qw(say);
use utf8;
use Gtk3;
use Readonly;

Readonly my @LINKS => (
    {
        url   => 'http://www.seznam.cz/',
        title => 'Seznam.cz',
    },
    {
        url   => 'http://www.google.cz/',
        title => 'Google',
    },
    {
        url   => 'http://www.next-url.cz/',
        title => 'Next URL',
    },
);
# Links to display
Readonly my %CONST => (
    WINDOW_TITLE        => 'Clipboard',
    WINDOW_BORDER_WIDTH => 10,
    WINDOW_WIDTH        => 500,
    WINDOW_HEIGHT       => 300,
    SPACING             => 10,
    # All these numbers are in pixels
);
# Some constants for better understanding

Gtk3->init;
# Initialize Gtk3

my $window       = Gtk3::Window->new('toplevel');
my $scrolledwin  = Gtk3::ScrolledWindow->new(undef, undef);
my $pressed_ctrl = 0;
my $store        = Gtk3::ListStore->new('Glib::String', 'Glib::String'
+);
my $view         = Gtk3::TreeView->new;
my $renderer     = Gtk3::CellRendererText->new;
my $vbox_main    = Gtk3::Box->new('vertical', $CONST{SPACING});
my $hbox_bla     = Gtk3::Box->new('horizontal', $CONST{SPACING});
my $button_copy  = Gtk3::Button->new;
my $column;
my $iter;

for my $item (@LINKS) {
    $iter = $store->append;
    $store->set($iter, 0 => $item->{title}, 1 => $item->{url});
}

$view->set_model($store);

$column = Gtk3::TreeViewColumn->new_with_attributes(
    'Title of page',
    $renderer,
    text => 0
);
$view->append_column($column);

$column = Gtk3::TreeViewColumn->new_with_attributes(
    'URL of page',
    $renderer,
    text => 1
);
$view->append_column($column);

$scrolledwin->add($view);

$button_copy->set_label('Copy URL to clipboard');
$button_copy->signal_connect(clicked => sub {
    my $selection = $view->get_selection;
    my @selpaths  = $selection->get_selected_rows;
    for my $tpath ($selpaths[0]) {
        say '$tpath --> ', $tpath;
        for my $tp (@$tpath) {
            say '$tp --> ', $tp;
            my $iter = $store->get_iter($tp);
            my $col0content = $store->get($iter, 0);
            my $col1content = $store->get($iter, 1);
            say '$col0content --> ', $col0content;
            say '$col1content --> ', $col1content;
            my $clipboard = Gtk3::Clipboard->get; # XXX
            $clipboard->set_text($col1content);
        }
    }
    return;
});

$vbox_main->pack_start($scrolledwin, 1, 1, 0);
$vbox_main->pack_start($hbox_bla, 0, 0, 0);

$hbox_bla->pack_start($button_copy, 0, 0, 0);

$window->set_title($CONST{WINDOW_TITLE});
$window->set_border_width($CONST{WINDOW_BORDER_WIDTH});
$window->set_default_size($CONST{WINDOW_WIDTH}, $CONST{WINDOW_HEIGHT})
+;
$window->signal_connect(destroy => sub {
    Gtk3->main_quit;
    return;
});
$window->signal_connect(key_press_event => sub {
    my $self  = shift;
    my $event = shift;

    $event = $event->keyval;
    if ($event == Gtk3::Gdk::KEY_Control_L or
        $event == Gtk3::Gdk::KEY_Control_R
    ) {
        $pressed_ctrl = 1;
        return;
    }
    if ($event == Gtk3::Gdk::KEY_w or
        $event == Gtk3::Gdk::KEY_q
    ) {
        if ($pressed_ctrl) {
            Gtk3->main_quit;
            return;
        }
        return;
    }
    return;
});
$window->signal_connect(key_release_event => sub {
    my $self  = shift;
    my $event = shift;

    $event = $event->keyval;
    if ($event == Gtk3::Gdk::KEY_Control_L or
        $event == Gtk3::Gdk::KEY_Control_R
    ) {
        $pressed_ctrl = 0;
        return;
    }
    return;
});
$window->add($vbox_main);
$window->show_all;

Gtk3->main;
# Gtk3 main loop
[download]

Output is:

$ perl clipboard.pl
$tpath --> ARRAY(0x9f46000)
$tp --> Gtk3::TreePath=SCALAR(0x9f45ff0)
$col0content --> Seznam.cz
$col1content --> http://www.seznam.cz/
*** unhandled exception in callback:
***   Cannot convert scalar a4a8bf0 to an object of type Gtk3::Gdk::At
+om at clipboard.pl line 86.
***  ignoring at /usr/share/perl5/vendor_perl/Gtk3.pm line 321.
[download]

Problem, as you can see in output, is at line 86, marked by '# XXX' at the end of the line.

What can I do if I want to copy a text in $col1content to clipboard?