My objective is to turn my "frame" into a text widget as soon as the button is pressed so that in the text widget I can display the output of the command line command (another process).

"turning a frame into a text widget" makes no sense. A frame is something that you would put a text widget into. You might want to make a new text widget appear inside of a frame or not. I doubt that you would want to destroy that frame.

Below is a simple Tk application. Make and copy the testing123.pl code into its own file. Run main program. Some kind of event like clicking a button is needed to start the whole process. The testing123.pl program randomly puts a little delay so that you can see that the lines are being displayed in realtime. The key to that is that a screen update method is called to "refresh" the screen after every line is added.

Update: I noticed that if you press GoButton again, it adds yet another text widget underneath the first one. I guess that is a "feature" of this demo! 

#!/usr/bin/perl -w
use strict;

use Tk;

my $mw = MainWindow->new;

my $main_frame = $mw->Frame()->pack(-side=>'top',-fill=>'x');
my $go_button = $main_frame->Button(-text=>'Go Button',
              -command => \&do_command)->pack();

MainLoop;

sub do_command
{
   # create and display text widget
   my $tw = $main_frame->Text()->pack();

   open (COPY_PROJ, '-|', 'perl testing123.pl') or die "unable to star
+t $!";

   my $first_line = "Copying project...please wait";
   $tw->insert( 'end', $first_line );
   
   my $copy_proj_line;
   
   while (defined ($copy_proj_line =<COPY_PROJ>) ) 
   {
       $tw->insert( 'end', $copy_proj_line );
       $tw->update(); ### this is the key to see values as they come
   }   
}

__END__

file: testing123.pl:

#!/usr/bin/perl -w
use strict;
$|=1;  #no buffering on stdout

for (1..10)
{ 
   print "line number $_\n";
   sleep 1 if (rand() > 0.5);
}

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In reply to Re: how to display output of a process in text widget in real time by Marshall
in thread how to display output of a process in text widget in real time by perlnu

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