real time updating of popen, bufsize=0 problems

[=?iso-8859-1?B?aWFuYXLp?=]

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.

[kyosohma]

On Apr 6, 1:44 pm, "ianaré" <[e-mail]:

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....7e8e2a3?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/forum...em-output.html

Mike

[=?iso-8859-1?B?aWFuYXLp?=]

On Apr 6, 3:22 pm, [e-mail] wrote:

On Apr 6, 1:44 pm, "ianaré" <[e-mail]:

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....3a3c287e8e2a3?...

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

Mike

Thanks but it doesn't work. Still prints it out all at once. It is
supposed to print, then wait 15sec for the next line to print.

[Rob Wolfe]

"ianaré" <ia****@gmail.comwrites:

hey all, I'm trying to get real time updates of batch file output.

[...]

So I tried subprocess:
proc = subprocess.Popen('"C:/path/to/test.bat"', bufsize=0,
stdout=subprocess.PIPE)

Instead of that:

for line in proc.stdout:
self.display.WriteText(line)

try that:

while True:
line = proc.stdout.readline()
if not line: break
self.display.WriteText(line)
When a file is used in a for loop it works like an iterator.
You can read details here (description of method ``next``):
http://docs.python.org/lib/bltin-file-objects.html

--
HTH,
Rob

[=?iso-8859-1?B?aWFuYXLp?=]

On Apr 6, 3:59 pm, Rob Wolfe <[e-mail]:

"ianaré" <[e-mail]:

hey all, I'm trying to get real time updates of batch file output.

[...]

So I tried subprocess:
proc = subprocess.Popen('"C:/path/to/test.bat"', bufsize=0,
stdout=subprocess.PIPE)

Instead of that:

for line in proc.stdout:
self.display.WriteText(line)

try that:

while True:
line = proc.stdout.readline()
if not line: break
self.display.WriteText(line)

When a file is used in a for loop it works like an iterator.
You can read details here (description of method ``next``):http://docs.python.org/lib/bltin-file-objects.html

--
HTH,
Rob

Rob, you are the man =) thanks!