Hi all. In my code below, I have a perl/Tk application with a scalebar tracking the progress of another program. The problem is that the main GUI freezes up until the tail process detects new input.

Is there a cleaner way to do this? I have experimented with File::Tail, but I get the same results.

Any help appreciated.

Regards,
Stacy. 

$tpid = open(MLOG,"tail -f $log_dir/mkisofs.log |");
&log("Started mkisofs.log tail: pid = $tpid");
  
while ($line = <MLOG>) {  
 if ($line =~ /estimate finish/) {
    $line =~ s/^\s+//; #remove leading whitespace
    $perc = (split(/\s+/, $line))[0];
    chop($perc); #get rid of the "%"
    $perc = sprintf("%3.0f", $perc);
    $progress_label -> configure(-text => "Completed: $perc%");
    $progress_scale -> set($perc);
    $main->update;
    }
    last if $line =~ /extents written/;
  }
  
kill('TERM', $tpid); #kill the tail process
close(MLOG);

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Edit: chipmunk 2001-05-30

In reply to Updating a GUI with tail??? by Anonymous Monk

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