Using subprocess.Popen() in a Windows service

[Mark Shewfelt]

Hello,

I am attempting to use Popen() in a Windows service. I have a small
Win32 .exe that I normally run through the os.popen2() function. I've
written a class to work with the input and output parameters that are
passed and captured from this exe. When I use the class outside of a
service using either subprocess.Pope n or os.popen2 work just fine.

When I use this class inside a Windows service it doesn't work. It
doesn't crash the service or anything but there are no values returned
from the Popen. Here's how I'm calling Popen:

p = subprocess.Pope n( cmd, shell=True, bufsize=128,
stdin=subproces s.PIPE, stdout=subproce ss.PIPE, stderr=subproce ss.PIPE,
cwd="C:\\path_t o_exe\\" )
p.wait()
(modbus_stdin, modbus_stdout)= (p.stdin,p.stdo ut)
lines = modbus_stdout.r eadlines()

While this doesn't fail there is nothing in the lines variable when it
finishes.

I am using Python 2.5 on a Windows XP Professional machine. Any help
would be greatly appreciated.

Best Regards,

Mark Shewfelt

[yomgui]

Re: Using subprocess.Pope n() in a Windows service

hi,

this is how i do it:

from subprocess import Popen, PIPE, call, check_call
if sys.platform == 'win32':
net.processWith outGui = Popen(
['python', self.temporaryF ilename,'-w'],
shell=False, cwd=lNetworkDir )
else:
net.processWith outGui = Popen(
[self.temporaryF ilename,'-w'],
shell=False, cwd=lNetworkDir )


hope it helps

yomgui



Mark Shewfelt wrote:

Hello,
>
I am attempting to use Popen() in a Windows service. I have a small
Win32 .exe that I normally run through the os.popen2() function. I've
written a class to work with the input and output parameters that are
passed and captured from this exe. When I use the class outside of a
service using either subprocess.Pope n or os.popen2 work just fine.
>
When I use this class inside a Windows service it doesn't work. It
doesn't crash the service or anything but there are no values returned
from the Popen. Here's how I'm calling Popen:
>
p = subprocess.Pope n( cmd, shell=True, bufsize=128,
stdin=subproces s.PIPE, stdout=subproce ss.PIPE, stderr=subproce ss.PIPE,
cwd="C:\\path_t o_exe\\" )
p.wait()
(modbus_stdin, modbus_stdout)= (p.stdin,p.stdo ut)
lines = modbus_stdout.r eadlines()
>
While this doesn't fail there is nothing in the lines variable when it
finishes.
>
I am using Python 2.5 on a Windows XP Professional machine. Any help
would be greatly appreciated.
>
Best Regards,
>
Mark Shewfelt