show in GUI stdout of a command

[twigster]

Hi,

I need to display in real time the output of a command line tool in a
GUI written so far with Tkinter and Pmw. I've got a command line tool
that I want to integrate to a GUI. The parameters are set using the GUI
and a button executes the command. The calc is long so I need to see how
fast it goes. This is given by the stdout...

any idea how to do this?

thanks
Alexandre

[Noah]

Re: show in GUI stdout of a command

Try Pexpect for running your command interactively

http://pexpect.sourceforge.net/

For example, if you wanted to run the "top" command you could
use a script like below. This updates the output every 5 seconds.
You can easily adjust the timeout.
---------------------------------------------------------------
import pexpect
def progress_callba ck (d):
"""This callback updates child command output.
This is used when running external commands
with pexpect.run.The callback is given a dictionary
of the local variables in pexpect.run. This explains
the syntax of d['child'].before, which you would
otherwise simple enter as child.before.
"""
print d['child'].before

pexpect.run("to p", timeout=5,
events={pexpect .TIMEOUT:progre ss_callback})
---------------------------------------------------------------

Next you would then have to add that whole
GUI thing yourself :-)

You can also try using pipes (popen and friends), but the
output will be block buffered, so it would come out chunky
and not in real time. There is no way to change the child's
buffering from block buffering to line buffering without using
a pseudo-TTY.

Yours,
Noah

[Ian Parker]

Re: show in GUI stdout of a command

In message <43a6fa19$0$288 $636a55ce@news. free.fr>, twigster
<twigsterREMOVE @THISmelix.net> writes[color=blue]
>Hi,
>
>I need to display in real time the output of a command line tool in a
>GUI written so far with Tkinter and Pmw. I've got a command line tool
>that I want to integrate to a GUI. The parameters are set using the GUI
>and a button executes the command. The calc is long so I need to see
>how fast it goes. This is given by the stdout...
>
>any idea how to do this?
>
>thanks
>Alexandre[/color]

Full of Christmas spirit, I'll suggest a look at

http://lfw.org/python/Console.py

I find it a few days ago when I was hunting for a way to "print" to the
tkinter window rather than stdout.

Regards
--
Ian Parker