use Win32::GUI();

$text=defined($ARGV[0]) ? $ARGV[0] : "Hello, world";
$font=Win32::GUI::Font->new(-name => "Comic Sans MS", -size => 24,);
$main=Win32::GUI::Window->new(-name => 'Main', -text => 'Perl');
$label=$main->AddLabel(-text => $text,-foreground => [255,0,0], -font => $font,);

$ncw=$main->Width()-$main->ScaleWidth();
$nch=$main->Height()-$main->ScaleHeight();
$w=$label->Width()+$ncw;
$h=$label->Height()+$nch;
$desk=Win32::GUI::GetDesktopWindow();
$dw=Win32::GUI::Width($desk);
$dh=Win32::GUI::Height($desk);
$x=($dw-$w)/2;
$y=($dh-$h)/2;

$main->Move($x,$y);
$main->Resize($w,$h);
$main->Show();
Win32::GUI::Dialog();

sub Main_Terminate {
    -1;
}

sub Main_Resize {
    my $mw = $main->ScaleWidth();
    my $mh = $main->ScaleHeight();
    my $lw = $label->Width();
    my $lh = $label->Height();
    $label->Left(int(($mw - $lw) / 2));
    $label->Top(int(($mh - $lh) / 2));
}