Tk destroy error

blackadder has asked for the wisdom of the Perl Monks concerning the following question:

Greetings PerlMonks

I have this simple script;

#! c:/perl/bin/perl.exe
#
#

use strict;
use warnings 'all';


system (CLS);
my $vu_win = MainWindow->new();
$vu_win->configure(-title=>'Verify User', -background=>'blue');
$vu_win->geometry('+100+300');

my $vu_frm1 = $vu_win->Frame(-relief=>'groove', -borderwidth=>3, -back
+ground=>'blue',)->pack(-side=>'top', -fill=>'x');
my $vu_lb1 = $vu_frm1->Label(-text=>'Enter Username',-background=>'blu
+e',-foreground=>'white',)->pack(-side=>'left');
my $vu_en1 = $vu_frm1->Entry(-textvariable=> \my $usr, -width=>35, -ba
+ckground=>'white')->pack(-side=>'left', -pady=>5);

my $vu_frm2 = $vu_win->Frame(-relief=>'groove', -borderwidth=>3, -back
+ground=>'blue',)->pack(-side=>'top', -fill=>'x');
my $vu_lb2 = $vu_frm2->Label(-text=>'Enter Password',-background=>'blu
+e',-foreground=>'white',)->pack(-side=>'left');
my $vu_en2 = $vu_frm2->Entry(-textvariable=> \my $pw, -show=>'*',-widt
+h=>35, -background=>'white')->pack(-side=>'left', -pady=>5);

$vu_en2->bind('<Return>'=> sub{ &process( $usr, $pw ), $vu_win->destro
+y});

sub process
{
    my ($usr_name, $pass_wd) = @_;
    $vu_win->destroy;
    print "\n$usr_name, $pass_wd\n";
}

MainLoop();
[download]

But when I run it I get the following output!

tsx14528, bncfvbncvbncvbncv
destroy (1):
 0 0x182e30c PVMG f=0008e507 {}(5)(5)
SV = PVMG(0x34878e4) at 0x182e30c
  REFCNT = 5
  FLAGS = (PADBUSY,PADMY,GMG,SMG,RMG,ROK)
  IV = 0
  NV = 0
  RV = 0x36b1c40
  PV = 0x36b1c40 ""
  CUR = 0
  LEN = 0
  MAGIC = 0x36c791c
    MG_VIRTUAL = 0x3b86340
    MG_TYPE = PERL_MAGIC_ext(~)
    MG_FLAGS = 0x02
      REFCOUNTED
    MG_OBJ = 0x36c059c
        SV = PV(0x367fb94) at 0x36c059c
          REFCNT = 1
          FLAGS = ()
          PV = 0x36c78f4 ""
          CUR = 0
          LEN = 20

C:\Scripts>
[download]

Would it be possible for you please:

to advice on the reasons for this output when I expect nothing but two strings ($usr_name, $pass_wd) to be displayed!

Any perls of wisdom would be highly appreciated!

Blackadder

Comment on Tk destroy error Select or Download Code

Replies are listed 'Best First'.
Re: Tk destroy error by Anonymous Monk on Sep 10, 2009 at 12:59 UTC
`Can't locate object method "new" via package "MainWindow" (perhaps you forgot to load "MainWindow"?)` You're calling destroy twice `perl -MTk -e " $a= tkinit; $a->destroy; warn $a; warn $a->destroy; " MainWindow=HASH(0x2bcb488) at -e line 1. destroy (1): 0 0x226260 PVMG f=00080007 {}(1)(1) SV = PVMG(0x1a6dccc) at 0x226260 REFCNT = 1 FLAGS = (ROK) IV = 0 NV = 0 RV = 0x2bcb488 PV = 0x2bcb488 "" CUR = 0 LEN = 0 Usage $widget->destroy(...) at -e line 1.` [download]	[reply] [d/l] [select]
Re^2: Tk destroy error by blackadder (Hermit) on Sep 10, 2009 at 13:02 UTC
Thank you Its been one of those days! Again! Regards Blackadder	[reply]


Syntactic Confectionery Delight
	PerlMonks