Using subprocess.Popen() in a Windows service

yomgui not at valid.com
Thu Nov 6 02:23:40 CET 2008


hi,

this is how i do it:

             from subprocess import Popen, PIPE, call, check_call
             if sys.platform == 'win32':
                 net.processWithoutGui = Popen(
                     ['python', self.temporaryFilename,'-w'],
                     shell=False, cwd=lNetworkDir)
             else:
                 net.processWithoutGui = Popen(
                     [self.temporaryFilename,'-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.Popen 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.Popen( cmd, shell=True, bufsize=128,
> stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
> cwd="C:\\path_to_exe\\" )
> p.wait()
> (modbus_stdin, modbus_stdout)=(p.stdin,p.stdout)
> lines = modbus_stdout.readlines()
> 
> 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



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