in reply to Re^2: Perl:TK - tail -f to text widget
in thread Perl:TK - standard output to text widget

You are better off getting rid of the tie to STDOUT, that is a hack of last resort. :-)

Look at this. You could open multiple IPC connected filehandles, watch them with multiple fileevents, and insert the output into the same text widget, with different colored text. 

#!/usr/bin/perl
use strict;
use Tk;
use IO::Handle;

my $H=IO::Handle->new;
open($H,"tail -f -n 50 z.txt |") or die $!;

my $main = MainWindow->new;

my $t = $main-> Scrolled('Text',
              -wrap=>'none')->pack(-expand=>1);

$main->fileevent(\*$H,'readable',[\&fill,$t]);

MainLoop;

sub fill {
  my ($w) = @_;
  my $text;
  my $text =<$H>;
  $w->insert('end',$text);
  $w->yview('end');
}

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Re^4: Perl:TK - tail -f to text widget
by rehmanz (Novice) on Aug 17, 2010 at 20:11 UTC
    Thanks zentara! Worked to perfection....Here is my code that tails three separate files using the tabs....Cheers! 
    use Tk;
use Tk::NoteBook;
use IO::Handle;

my $S=IO::Handle->new;
my $D=IO::Handle->new;
my $E=IO::Handle->new;

my $baseDir = "/";
my $sumFile = $baseDir."summary.log";
my $detFile = $baseDir."detail.log";
my $errFile = $baseDir."error.log";

open($S,"tail -f $sumFile |") or die $!;
open($D,"tail -f $detFile |") or die $!;
open($E,"tail -f $errFile |") or die $!;

$mw = MainWindow->new();
$mw->geometry( "600x200" );
$book = $mw->NoteBook()->pack( -fill=>'both', -expand=>1 );

my $sumTab = $book->add( "Sheet 1", -bitmap => 'info');
my $detTab = $book->add( "Sheet 2", -bitmap => 'questhead');
my $errTab = $book->add( "Sheet 3", -bitmap => 'error');

my $sumText = $sumTab->Scrolled('Text', -wrap=>'none')->pack(-expand=>
+1);
my $detText = $detTab->Scrolled('Text', -wrap=>'none')->pack(-expand=>
+1);
my $errText = $errTab->Scrolled('Text', -wrap=>'none')->pack(-expand=>
+1);

$sumText->fileevent(\*$S,'readable',[\&fillSummary,$sumText]);
$detText->fileevent(\*$D,'readable',[\&fillDetails,$detText]);
$errText->fileevent(\*$E,'readable',[\&fillErrors,$errText]);

MainLoop;


sub fillSummary {
  my ($w) = @_;
  my $text = <$S>;
  $w->insert('end',$text);
  $w->yview('end');
}

sub fillDetails {
  my ($w) = @_;
  my $text = <$D>;
  $w->insert('end',$text);
  $w->yview('end');
}

sub fillErrors {
  my ($w) = @_;
  my $text = <$E>;
  $w->insert('end',$text);
  $w->yview('end');
}

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