Hi!
I must have been searching in the wrong places or with the wrong
keywords but I couldn't find out how to implement something such as
what is done by the threading module on Windows (95, 98 and XP are the
ones used by my clients). My preference is for something available in
the standard library if possible.
I have a simple task where I want my GUI to be able to open several
applications simultaneously. Using the threading module everything
works perfectly on Linux but the program won't run on Windows.
Any hints on what should I do?
The working code is really simple and is all what I need on both
platforms (pseudo-code follows):
import threading
(...)
class MyApplication(. ..):
(...)
def someMethod(...) :
(...)
def temporaryFuncti on():
os.spawnv('P_NO WAIT', 'another.py', ['another.py', parameters])
thread = threading.Threa d(target = temporaryFuncti on)
thread.start()
def anotherMethod(. ..):
(...)
def temporaryFuncti on():
os.spawnv('P_NO WAIT', 'yetanother.py' , ['yetanother.py' , parameters])
thread = threading.Threa d(target = temporaryFuncti on)
thread.start()
and so on.
(Yes, I could factor 'temporaryFunct ion' and reduce 5 lines of code in
my application, but I still don't know what will be necessary to do to
make it work on Windows, so I left it as is and factor it later.)
Any hints on how to accomplish that in a portable way? Or what
additional code will I have to use to make it work in Windows?
Thanks in advance,
--
Godoy. <go***@metalab. unc.edu>
22  6578 
Jorge Godoy fed this fish to the penguins on Monday 29 September 2003
05:00 am:
I have a simple task where I want my GUI to be able to open several
applications simultaneously. Using the threading module everything
works perfectly on Linux but the program won't run on Windows.
Forgive me if this has some obvious facet that I'm missing -- I'm not
experienced in os.spawnv* family.
However, the documentation I have for os.spawnv() suggests that this
call alone will create a separate/new process. And you are calling it
with a no-wait argument... So why do you even need the threading
overhead?
def temporaryFuncti on():
os.spawnv('P_NO WAIT', 'another.py', ['another.py',
parameters])
Hmmm, if "another.py " is the target, you may be encountering the
possibility that Windows doesn't know how to start a .py file from the
command line. Windows (especially the W9x line) doesn't, to my
knowledge, honor #! lines in script files.
-- =============== =============== =============== =============== == <
wl*****@ix.netc om.com | Wulfraed Dennis Lee Bieber KD6MOG <
wu******@dm.net | Bestiaria Support Staff <
=============== =============== =============== =============== == <
Bestiaria Home Page: http://www.beastie.dm.net/ <
Home Page: http://www.dm.net/~wulfraed/ <
Jorge Godoy <go***@metalab. unc.edu> wrote in message news:<m3******* *****@ieee.org> ... Hi!
I must have been searching in the wrong places or with the wrong
keywords but I couldn't find out how to implement something such as
what is done by the threading module on Windows (95, 98 and XP are the
ones used by my clients). My preference is for something available in
the standard library if possible.
I have a simple task where I want my GUI to be able to open several
applications simultaneously. Using the threading module everything
works perfectly on Linux but the program won't run on Windows.
Any hints on what should I do?
The working code is really simple and is all what I need on both
platforms (pseudo-code follows):
import threading
(...)
class MyApplication(. ..):
(...)
def someMethod(...) :
(...)
def temporaryFuncti on():
os.spawnv('P_NO WAIT', 'another.py', ['another.py', parameters])
thread = threading.Threa d(target = temporaryFuncti on)
thread.start()
def anotherMethod(. ..):
(...)
def temporaryFuncti on():
os.spawnv('P_NO WAIT', 'yetanother.py' , ['yetanother.py' , parameters])
thread = threading.Threa d(target = temporaryFuncti on)
thread.start()
and so on.
(Yes, I could factor 'temporaryFunct ion' and reduce 5 lines of code in
my application, but I still don't know what will be necessary to do to
make it work on Windows, so I left it as is and factor it later.)
Any hints on how to accomplish that in a portable way? Or what
additional code will I have to use to make it work in Windows?
Thanks in advance, http://www.python.org/doc/current/lib/os-process.html says
....
....
....
spawnl(mode, path, ...)
spawnle(mode, path, ..., env)
spawnlp(mode, file, ...)
spawnlpe(mode, file, ..., env)
spawnv(mode, path, args)
spawnve(mode, path, args, env)
spawnvp(mode, file, args)
spawnvpe(mode, file, args, env)
....
....
....
Availability: Unix, Windows. spawnlp(), spawnlpe(), spawnvp() and
spawnvpe() are not available on Windows. New in version 1.6.
....
....
....
Regards
Peter Pe*******@gmx.n et (Peter Abel) writes: http://www.python.org/doc/current/lib/os-process.html says
...
...
...
spawnl(mode, path, ...)
spawnle(mode, path, ..., env)
spawnlp(mode, file, ...)
spawnlpe(mode, file, ..., env)
spawnv(mode, path, args)
spawnve(mode, path, args, env)
spawnvp(mode, file, args)
spawnvpe(mode, file, args, env)
...
...
...
Availability: Unix, Windows. spawnlp(), spawnlpe(), spawnvp() and
spawnvpe() are not available on Windows. New in version 1.6.
So I should be safe since I'm using spawnv (and not spawnvp or
spawnvpe). :-)
Thanks anyway.
See you,
--
Godoy. <go***@metalab. unc.edu>
Dennis Lee Bieber <wl*****@ix.net com.com> writes: Forgive me if this has some obvious facet that I'm missing -- I'm not
experienced in os.spawnv* family.
Neither am I. In fact, this program was my first use of it.
However, the documentation I have for os.spawnv() suggests
that this call alone will create a separate/new process. And you are
calling it with a no-wait argument... So why do you even need the
threading overhead?
This isn't the behaviour I found here on a Linux box. The caller
process got 'stuck' and only worked again when the called proccess
ended.
With threads I got it working all the time.
Hmmm, if "another.py " is the target, you may be encountering the
possibility that Windows doesn't know how to start a .py file from the
command line. Windows (especially the W9x line) doesn't, to my
knowledge, honor #! lines in script files.
Using the thread module I could get it to work on Windows and then,
yes. I got this problem. :-)
Sorry for my lameness on Windows but this isn't my platform of
choice. I'll add some conditional and check the platform...
On the other hand, isn't there a way to associate programs with
extensions on Windows? Wouldn't this solve the problem with the call I
made? Or it only works in certain circunstances and (by Murphy's law)
this is not one of those circunstances?
Thanks for your help,
--
Godoy. <go***@metalab. unc.edu>
On Mon, 29 Sep 2003 23:29:18 -0300, Jorge Godoy <go***@metalab. unc.edu>
wrote: Availability: Unix, Windows. spawnlp(), spawnlpe(), spawnvp() and
spawnvpe() are not available on Windows. New in version 1.6.
So I should be safe since I'm using spawnv (and not spawnvp or
spawnvpe). :-)
For running a file based on its extension, you could try os.startfile().
J.
Jorge Godoy fed this fish to the penguins on Monday 29 September 2003
07:31 pm:
This isn't the behaviour I found here on a Linux box. The caller
process got 'stuck' and only worked again when the called proccess
ended.
Strange...
On the other hand, isn't there a way to associate programs with
extensions on Windows? Wouldn't this solve the problem with the call I
made? Or it only works in certain circunstances and (by Murphy's law)
this is not one of those circunstances?
I think NT has the ability to go by extension, but not W9x.
You might have to explicitly invoke the python executable, and pass
/it/ the .py file as the first argument
-- =============== =============== =============== =============== == <
wl*****@ix.netc om.com | Wulfraed Dennis Lee Bieber KD6MOG <
wu******@dm.net | Bestiaria Support Staff <
=============== =============== =============== =============== == <
Bestiaria Home Page: http://www.beastie.dm.net/ <
Home Page: http://www.dm.net/~wulfraed/ <
Jordan Krushen <jo****@krushen .com> writes: For running a file based on its extension, you could try os.startfile().
Thank you.
It will probably solve my problem on Windows.
Unfortunately, it isn't a portable way since this command doesn't even
exist on my Linux (Python 2.2.2). I will have to use the conditional I
said on my previous message.
Thanks again,
--
Godoy. <go***@metalab. unc.edu>
Dennis Lee Bieber <wl*****@ix.net com.com> writes: Jorge Godoy fed this fish to the penguins on Monday 29 September 2003
07:31 pm:
This isn't the behaviour I found here on a Linux box. The caller
process got 'stuck' and only worked again when the called proccess
ended.
Strange...
I thought the same thing and even thought I was using os.spawnv() in a
wrong way. Even with the 'P_NOWAIT' flag it still hangs.
I'm using:
Python 2.2.2 (#1, Mar 6 2003, 13:36:19)
[GCC 3.2.2] on linux-i386
I haven't investigated os.spawnv() alone in Windows to see if this
also happens there. It will be funny if by this very first time the
problem is on the Linux box instead of the Windows box (since I'm more
used to unices, I'm more familiar with their quirks than with
Windows', specially with all those 'flavours' of Windows...).
I think NT has the ability to go by extension, but not W9x.
Windows XP can't go by extension either.
You might have to explicitly invoke the python executable, and pass
/it/ the .py file as the first argument
I see. If it doesn't work using os.startfile() as suggested on another
message I'll probably stick with this approach.
Thanks!
--
Godoy. <go***@metalab. unc.edu>
Hello Jorge, I have a simple task where I want my GUI to be able to open several
applications simultaneously. Using the threading module everything
works perfectly on Linux but the program won't run on Windows.
What do you mean by "won't run"? Does it crash? ...
Any hints on what should I do?
The working code is really simple and is all what I need on both
platforms (pseudo-code follows):
[...]
Just guessing:
1. The spawnl of a .py don't work. You need to start the python interpreter
on the .py file
2. The GUI toolkit you're using is causing the problem. To check this try
lauch threads without any gui and see if it works.
HTH.
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