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Win XP: How to hide command window for sub processes?

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klausfpga at gmail

Oct 29, 2009, 1:41 AM

Post #1 of 9 (1637 views)
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Win XP: How to hide command window for sub processes?

Hi,

I have a Python script which wants to start a subprocess and wait for
it to finish.

However I would like to have NO command window popping up during
execution.

My main Python script is started with the .pyw suffix, thus I got rid
of the main console and I just see my GUI.

So far I tried
os.system()

and subprocess.call()

with os.system() the command window pops up and I see my commands
output.

with the subprocess.call() and stdin ./ stdout / stderr redirection I
manage to get rid of stdout/stderr
( redirecting to the file 'NUL:' )

but the window stays.

the subprocess is a call to a .exe file with multiple parameters.

I would appreciate any hints

bye

Klaus
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_rdi_ at web

Oct 29, 2009, 3:25 AM

Post #2 of 9 (1614 views)
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Re: Win XP: How to hide command window for sub processes? [In reply to]

klausfpga schrieb:
> Hi,
>
> I have a Python script which wants to start a subprocess and wait for
> it to finish.
>
> However I would like to have NO command window popping up during
> execution.

You need to specify the hide parameter for windows.

import subprocess
kwargs = {}
if subprocess.mswindows:
su = subprocess.STARTUPINFO()
su.dwFlags |= subprocess.STARTF_USESHOWWINDOW
su.wShowWindow = subprocess.SW_HIDE
kwargs['startupinfo'] = su
process = subprocess.Popen( (r'c:\python25\python.exe',
r'd:\projekte\bar.py'), **kwargs )

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clp2 at rebertia

Oct 29, 2009, 3:44 AM

Post #3 of 9 (1603 views)
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Re: Win XP: How to hide command window for sub processes? [In reply to]

On Thu, Oct 29, 2009 at 3:25 AM, Rüdiger Ranft <_rdi_ [at] web> wrote:
> klausfpga schrieb:
>> Hi,
>>
>> I have a Python script which wants to start a subprocess and wait for
>> it to finish.
>>
>> However I would like to have NO command window popping up during
>> execution.
>
> You need to specify the hide parameter for windows.
>
> import subprocess
> kwargs = {}
> if subprocess.mswindows:
> su = subprocess.STARTUPINFO()
> su.dwFlags |= subprocess.STARTF_USESHOWWINDOW
> su.wShowWindow = subprocess.SW_HIDE
> kwargs['startupinfo'] = su
> process = subprocess.Popen( (r'c:\python25\python.exe',
> r'd:\projekte\bar.py'), **kwargs )

Interestingly, none of that appears to be documented. I smell a docs
bug waiting to be reported.

Cheers,
Chris
--
http://blog.rebertia.com
--
http://mail.python.org/mailman/listinfo/python-list

martin.hellwig at dcuktec

Oct 29, 2009, 4:37 AM

Post #4 of 9 (1609 views)
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Re: Win XP: How to hide command window for sub processes? [In reply to]

Chris Rebert wrote:
> On Thu, Oct 29, 2009 at 3:25 AM, Rüdiger Ranft <_rdi_ [at] web> wrote:
>> klausfpga schrieb:
>>> Hi,
>>>
>>> I have a Python script which wants to start a subprocess and wait for
>>> it to finish.
>>>
>>> However I would like to have NO command window popping up during
>>> execution.
>> You need to specify the hide parameter for windows.
>>
>> import subprocess
>> kwargs = {}
>> if subprocess.mswindows:
>> su = subprocess.STARTUPINFO()
>> su.dwFlags |= subprocess.STARTF_USESHOWWINDOW
>> su.wShowWindow = subprocess.SW_HIDE
>> kwargs['startupinfo'] = su
>> process = subprocess.Popen( (r'c:\python25\python.exe',
>> r'd:\projekte\bar.py'), **kwargs )
>
> Interestingly, none of that appears to be documented.

Except for here:
http://msdn.microsoft.com/en-us/library/ms682425%28VS.85%29.aspx

> I smell a docs bug waiting to be reported.
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com

--
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'
--
http://mail.python.org/mailman/listinfo/python-list

clp2 at rebertia

Oct 29, 2009, 4:46 AM

Post #5 of 9 (1607 views)
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Re: Win XP: How to hide command window for sub processes? [In reply to]

On Thu, Oct 29, 2009 at 4:37 AM, Martin P. Hellwig
<martin.hellwig [at] dcuktec> wrote:
> Chris Rebert wrote:
>>
>> On Thu, Oct 29, 2009 at 3:25 AM, Rüdiger Ranft <_rdi_ [at] web> wrote:
>>>
>>> klausfpga schrieb:
>>>>
>>>> Hi,
>>>>
>>>> I have a Python script which wants to start a subprocess and wait for
>>>> it to finish.
>>>>
>>>> However I would like to have NO command window popping up during
>>>> execution.
>>>
>>> You need to specify the hide parameter for windows.
>>>
>>> import subprocess
>>> kwargs = {}
>>> if subprocess.mswindows:
>>> su = subprocess.STARTUPINFO()
>>> su.dwFlags |= subprocess.STARTF_USESHOWWINDOW
>>> su.wShowWindow = subprocess.SW_HIDE
>>> kwargs['startupinfo'] = su
>>> process = subprocess.Popen( (r'c:\python25\python.exe',
>>> r'd:\projekte\bar.py'), **kwargs )
>>
>> Interestingly, none of that appears to be documented.
>
> Except for here:
> http://msdn.microsoft.com/en-us/library/ms682425%28VS.85%29.aspx

I was referring to the following bits of the subprocess module used in
the above code:
subprocess.mswindows
subprocess.STARTUPINFO()
subprocess.STARTF_USESHOWWINDOW
subprocess.SW_HIDE

none of which are mentioned in the module's docs:
http://docs.python.org/dev/py3k/library/subprocess.html

Cheers,
Chris
--
http://blog.rebertia.com
--
http://mail.python.org/mailman/listinfo/python-list

martin.hellwig at dcuktec

Oct 29, 2009, 4:57 AM

Post #6 of 9 (1609 views)
Permalink

Re: Win XP: How to hide command window for sub processes? [In reply to]

Chris Rebert wrote:
<cut>
>> Except for here:
>> http://msdn.microsoft.com/en-us/library/ms682425%28VS.85%29.aspx
>
> I was referring to the following bits of the subprocess module used in
> the above code:

Me too actually :-)

> subprocess.mswindows
> subprocess.STARTUPINFO()
> subprocess.STARTF_USESHOWWINDOW
> subprocess.SW_HIDE
>
> none of which are mentioned in the module's docs:
> http://docs.python.org/dev/py3k/library/subprocess.html

Since this is platform specific stuff I would argue that it has no
business being repeated, although a link to where it is documented
elsewhere would have been nice.

--
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'
--
http://mail.python.org/mailman/listinfo/python-list

clp2 at rebertia

Oct 29, 2009, 5:37 AM

Post #7 of 9 (1596 views)
Permalink

Re: Win XP: How to hide command window for sub processes? [In reply to]

On Thu, Oct 29, 2009 at 4:57 AM, Martin P. Hellwig
<martin.hellwig [at] dcuktec> wrote:
> Chris Rebert wrote:
> <cut>
>>>
>>> Except for here:
>>> http://msdn.microsoft.com/en-us/library/ms682425%28VS.85%29.aspx
>>
>> I was referring to the following bits of the subprocess module used in
>> the above code:
>
> Me too actually :-)
>
>> subprocess.mswindows
>> subprocess.STARTUPINFO()
>> subprocess.STARTF_USESHOWWINDOW
>> subprocess.SW_HIDE
>>
>> none of which are mentioned in the module's docs:
>> http://docs.python.org/dev/py3k/library/subprocess.html
>
> Since this is platform specific stuff I would argue that it has no business
> being repeated, although a link to where it is documented elsewhere would
> have been nice.

True, the Windows APIs are documented but it's not mentioned at all
that they're accessible in a certain form from subprocess.
Many other stdlib modules (e.g. `os` -
http://docs.python.org/library/os.html) include and list
platform-specific functions, I don't see why subprocess should be
different.

Cheers,
Chris
--
http://blog.rebertia.com
--
http://mail.python.org/mailman/listinfo/python-list

klausfpga at gmail

Oct 29, 2009, 4:54 PM

Post #8 of 9 (1601 views)
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Re: Win XP: How to hide command window for sub processes? [In reply to]

On Oct 29, 11:25�am, R�diger Ranft <_r...@web.de> wrote:
> klausfpga schrieb:
>
> > Hi,
>
> > I have a Python script which wants to start a subprocess and wait for
> > it to finish.
>
> > However I would like to have NO command window popping up during
> > execution.
>
> You need to specify the hide parameter for windows.
>
> import subprocess
> kwargs = {}
> if subprocess.mswindows:
> � � su = subprocess.STARTUPINFO()
> � � su.dwFlags |= subprocess.STARTF_USESHOWWINDOW
> � � su.wShowWindow = subprocess.SW_HIDE
> � � kwargs['startupinfo'] = su
> process = subprocess.Popen( (r'c:\python25\python.exe',
> � � r'd:\projekte\bar.py'), **kwargs )

Thanks Ruediger,

I'll try that immediately tomorrow, when working again on a windows
host.

Good to know, that the Python API supports this.
though this feature was not that easy to be found in the doc.

This will make my application much nicer.
--
http://mail.python.org/mailman/listinfo/python-list

_rdi_ at web

Nov 4, 2009, 12:30 AM

Post #9 of 9 (1561 views)
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Re: Win XP: How to hide command window for sub processes? [In reply to]

klausfpga schrieb:
> On Oct 29, 11:25 am, R�diger Ranft <_r...@web.de> wrote:

> Thanks Ruediger,
>
> I'll try that immediately tomorrow, when working again on a windows
> host.
>
> Good to know, that the Python API supports this.
> though this feature was not that easy to be found in the doc.

Well, getting the point from subproces.py was easy. Finding the
documentation about STARTUPINFO in the MSDN was not. I better stop here
before this post turns into a rant about Mircosofts use of javascript.

bye
Rudi
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