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POTk::Stderr empty text subwidget
 

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    <p>I've written a perl/tk gui. The stderr &amp; stdout write to a popup window, but I cannot clear the text when the popup window is destroyed (it is actually withdrawn). I could not install Tk::Stderr so I appended the module to the end of my script. Below is a working example.</p> <p>I have added the following line to the Print subroutine, but it is overkill:</p> <pre><code>$text-&gt;delete('0.0', 'end'); </code></pre> <p>My suspicion is that something could be added to the following line in the Populate subroutine:</p> <pre><code>$mw-&gt;protocol(WM_DELETE_WINDOW =&gt; [ $mw =&gt; 'withdraw']); </code></pre> <p>but I don't know what. I would appreciate any assistance.</p> <pre><code>#!/usr/bin/perl use warnings; use strict; use Tk; # use Tk::Stderr; &lt;&lt; ** pasted module after main ** - honyok # create main window my $mw = MainWindow-&gt;new; $mw-&gt;InitStderr; $mw-&gt;optionAdd("*font", "-*-calibri-normal-r-*-*-*-120-*-*-*-*-*-*"); $mw-&gt;protocol('WM_DELETE_WINDOW'=&gt; sub{exit}); $mw-&gt;geometry( "100x100"); $mw-&gt;resizable(0,0);# not resizable # create buttons my $button1=$mw-&gt;Button(-text=&gt;'STDERR',-command=&gt;[sub{print STDERR "Writing to STDERR\n";}])-&gt;pack; my $button2=$mw-&gt;Button(-text=&gt;'STDOUT',-command=&gt;[sub{print STDOUT "Writing to STDOUT\n";}])-&gt;pack; MainLoop; # =========================== end main ================================== ##============================================================================== ## Tk::Stderr - capture program standard error output ##============================================================================== ## $Id: Stderr.pm,v 1.2 2003/04/01 03:58:42 kevin Exp $ ##============================================================================== #require 5.006; package Tk::Stderr; use strict; use warnings; use vars qw($VERSION @ISA); ($VERSION) = q$Revision: 1.2 $ =~ /Revision:\s+(\S+)/ or $VERSION = "0.0"; use base qw(Tk::Derived Tk::MainWindow); use Tk::ROText; use Tk::Frame; ##============================================================================== ## Populate ##============================================================================== sub Populate { my ($mw, $args) = @_; my $private = $mw-&gt;privateData; $private-&gt;{ReferenceCount} = 0; $private-&gt;{Enabled} = 0; $mw-&gt;SUPER::Populate($args); $mw-&gt;withdraw; $mw-&gt;protocol(WM_DELETE_WINDOW =&gt; [ $mw =&gt; 'withdraw']); my $f = $mw-&gt;Frame( Name =&gt; 'stderr_frame', )-&gt;pack(-fill =&gt; 'both', -expand =&gt; 1); my $text = $f-&gt;Scrolled( 'ROText', Name =&gt; 'stderr_text', -scrollbars =&gt; 'se', -label=&gt;'Output/Errors', -wrap =&gt; 'none' #-background=&gt;'slate grey' )-&gt;pack(-fill =&gt; 'both', -expand =&gt; 1); $mw-&gt;Advertise('text' =&gt; $text); $mw-&gt;ConfigSpecs( '-title' =&gt; [ qw/METHOD title Title/, "truGrid" ], ); $mw-&gt;Redirect(1); return $mw; } ##============================================================================== ## Redirect ##============================================================================== sub Redirect { my ($mw, $boolean) = @_; my $private = $mw-&gt;privateData; my $old = $private-&gt;{Enabled}; if ($old &amp;&amp; !$boolean) { untie *STDOUT;# ** hacked this line ** - honyok untie *STDERR; $SIG{__WARN__} = 'DEFAULT'; } elsif (!$old &amp;&amp; $boolean) { tie *STDOUT, 'Tk::Stderr::Handle', $mw;# ** hacked this line ** - honyok tie *STDERR, 'Tk::Stderr::Handle', $mw; $SIG{__WARN__} = sub { print STDOUT @_ };# ** hacked this line ** - honyok $SIG{__WARN__} = sub { print STDERR @_ }; } $private-&gt;{Enabled} = $boolean; return $old; } ##============================================================================== ## DecrementReferenceCount ##============================================================================== sub DecrementReferenceCount { my ($mw) = @_; my $private = $mw-&gt;privateData; if (--$private-&gt;{ReferenceCount} &lt;= 0) { $mw-&gt;destroy; } } ##============================================================================== ## IncrementReferenceCount ##============================================================================== sub IncrementReferenceCount { my ($mw) = @_; my $private = $mw-&gt;privateData; ++$private-&gt;{ReferenceCount}; } package MainWindow; use strict; use warnings; my $error_window; ##============================================================================== ## InitStderr ##============================================================================== sub InitStderr { my ($mw, $title) = @_; unless (defined $error_window) { $error_window = Tk::Stderr-&gt;new; $error_window-&gt;title($title) if defined $title; } $error_window-&gt;IncrementReferenceCount; $mw-&gt;OnDestroy([ 'DecrementReferenceCount' =&gt; $error_window ]); return $mw; } ##============================================================================== ## StderrWindow ##============================================================================== sub StderrWindow { return $error_window; } ##============================================================================== ## RedirectStderr ##============================================================================== sub RedirectStderr { my ($mw, $boolean) = @_; unless (defined $error_window) { $mw-&gt;InitStderr if $boolean; return; } return $error_window-&gt;Redirect($boolean); } ##============================================================================== ## Define the handle that actually implements things. ##============================================================================== BEGIN { package Tk::Stderr::Handle; use strict; use warnings; ##========================================================================== ## TIEHANDLE ##========================================================================== sub TIEHANDLE { my ($class, $window) = @_; bless \$window, $class; } ##========================================================================== ## PRINT ##========================================================================== sub PRINT { my $window = shift; my $text = $$window-&gt;Subwidget('text'); $text-&gt;insert('end', $_) foreach (@_); $text-&gt;see('end'); $$window-&gt;deiconify; $$window-&gt;raise; $$window-&gt;focus; $$window-&gt;update;# ** hacked this line ** - honyok } ##========================================================================== ## PRINTF ##========================================================================== sub PRINTF { my ($window, $format) = splice @_, 0, 2; $window-&gt;PRINT(sprintf $format, @_); } } 1; ##============================================================================== ## $Log: Stderr.pm,v $ ## Revision 1.2 2003/04/01 03:58:42 kevin ## Add RedirectStderr method to allow redirection to be switched on and off. ## ## Revision 1.1 2003/03/26 21:48:43 kevin ## Fix dependencies in Makefile.PL ## ## Revision 1.0 2003/03/26 19:11:32 kevin ## Initial revision ##============================================================================== </code></pre>
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