[ python-Bugs-1057061 ] subprocess on Windows: extra windows

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Bugs item #1057061, was opened at 2004-10-29 23:49
Message generated for change (Comment added) made by astrand
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Category: Python Library
Group: Python 2.4
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Russell Owen (reowen)
Assigned to: Nobody/Anonymous (nobody)
Summary: subprocess on Windows: extra windows

Initial Comment:
My understanding was that subprocess.py was supposed to be 
backwards compatible with at least Python 2.3 if not 2.2. Wanting 
subprocess and backwards compatibility, I grabbed the subprocess.py 
from 2.4b1, changed the import if so that win32api was used (since I 
had no _subprocess library!) and found several problems, of which 
this is is the mildes:

when using subprocess.Popen on Windows I get one or more windows 
called C:\WINNT\system32\CMD.EXE popping up. Sometimes they 
stick around, other times they are only around for a short time. Note 
that I don't see this probem using os.popen3 (on the 
other hand, os.popen3 has inferior error handling).

The following code is one example:
from subprocess import *
Popen("ds9 -title foo", shell=True, cwd="C:\Program Files\ds9\")


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>Comment By: Peter Åstrand (astrand)
Date: 2004-11-07 15:33

Message:
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This happens because cmd.exe/command.com opens a window by
default. To get rid of this, we need to pass SW_HIDE to
startupinfo.wShowWindow. 

I've fixed this in revision 1.8 of subprocess.py and
revision 1.3 of _subprocess.py: When using shell=True,
SW_HIDE is now default. 


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Comment By: Russell Owen (reowen)
Date: 2004-11-03 20:02

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I am using Windows 2000 Professional.

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Comment By: Peter Åstrand (astrand)
Date: 2004-10-31 08:09

Message:
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Which Windows version are you using?

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