real time updating of popen, bufsize=0 problems

[kyosohma at gmail.com]

On Apr 6, 1:44 pm, "ianaré" <ian... at gmail.com> wrote:
> hey all, I'm trying to get real time updates of batch file output.
>
> Here is my batch file:
> @echo off
> echo 1
> @ping 127.0.0.1 -n 2 -w 1500 > nul
> echo 2
> @ping 127.0.0.1 -n 2 -w 1500 > nul
> echo 3
>
> If I run it in cmd.exe it will print "1", wait 15sec, print "2", wait
> 15sec, print "3".
>
> I tried doing it like this:
>
> r, w, e = popen2.popen3('"C:/path/to/test.bat"',bufsize=0)
>     for line in r:
>         self.display.WriteText(line)
>
> ... but get: ValueError: popen3() arg 3 must be -1
>
> If I use -1, then it waits for the batch file to complete, and prints
> out all 3 lines at once.
>
> So I tried subprocess:
> proc = subprocess.Popen('"C:/path/to/test.bat"', bufsize=0,
>   stdout=subprocess.PIPE)
> for line in proc.stdout:
>     self.display.WriteText(line)
>
> No error message, but no real time printing either.
>
> info:
> self.display is a wx.TextCtrl - not that it should matter,as
> 'WriteText()' behaves basically like 'print'
> winXP pro SP2, python 2.5, wxPython 2.6.3.3
>
> You help is appreciated.

Hi,

I think this script on another post will help:

http://groups.google.com/group/comp.lang.python/msg/9fa3a3c287e8e2a3?hl=en&

The 4 line code example (from Daniel) in one of the posts at this link
worked with your batch file:
http://www.velocityreviews.com/forums/t350573-redirect-ossystem-output.html

Mike