Hi, I'm hoping you can help me on something that has bugged me for a couple of years now. I have a perl/TK script which runs a main perl script with a basic TK front end. The problem I just cannot seem to crack is how to run it and achieve three things:
1) - all STDOUT is printed to a text widget (including from any system commands that are all called)
2) - the Tk front end doesn't just hang whilst the routine is running (and it can run for a couple of days sometimes, depending on what system commands are being run).
3) - it must work on Windows not just Unix
Below is a simple test code which runs what I currently do (badly) 
#!/usr/bin/perl -w
# use strict;
# use Encode::Unicode;
use Tk;

# open(H, "tail -f -n 25 $ARGV[0]|") or die "Nope: $!";
# open(STDOUT, "+> |") or die "Nope: $!";
# open STDOUT, '+<', \&test or die "Can't open STDOUT: $!";
  
$mw=MainWindow->new(); # create main window, and stretch it to fill sc
+reen minus a bit
$mw->title("GRM Consulting Ltd. - GENESIS Optimisation Coupling Tool v
+1.0");
$mw->geometry("800x600+100+100");

 
my $t = $mw->Text(-width => 80, -height => 25, -wrap => 'none');
$t->pack(-expand => 1);
# $mw->fileevent(\*STDOUT, 'readable', [\&fill_text_widget, $t]);

$mw->update;
test();

MainLoop;



sub fill_text_widget {
 
    my($widget) = @_;
 
    my($stat, $data);
    $stat = sysread STDOUT, $data, 4096;
    die "sysread error:  $!" unless defined $stat;
    $widget->insert('end', $data);
    $widget->yview('end');
 
}


## Test routine to simulate my main program execution

sub test {

for ($i=0; $i<3; $i++ ) {
print "testline $i\n";
sleep 1;
}

$command="dir";
system("$command");

for ($i=0; $i<3; $i++ ) {
print "testline1 $i\n";
sleep 1;
}

die;
}

[download]
As you'll see by the commented out line I have been trying to use the filevent command to pipe things and have had a little bit of success but not really too much. If you can help with this it is going to solve a long standing problem in my understanding of how perl and tk talk.
Many thanks
Martin Gambling (<- hence the Gambling user name!!)

In reply to Executing pipe STDOUT from a subroutine to Widget by Gambling1uk

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