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From: Kushal Kumaran on 23 Apr 2010 22:52
On Sat, Apr 24, 2010 at 1:21 AM, Amit Uttamchandani
<amit.uttam(a)gmail.com> wrote:
> On Thu, Apr 22, 2010 at 10:12:47PM -0400, Dave Angel wrote:
>> amit wrote:
>> >How does one go about calling multiple programs using subprocess?
>> >
>> >This is the program flow:
>> >
>> >C:\> wrenv.exe
>> >C:\> make clean
>> >..
>> >..
>> >
>> >The 'wrenv.exe' is necessary since it sets up the proper environment
>> >for building. How do I use subprocess to execute 'wrenv.exe' and then
>> >the 'make clean' command.
>> >
>> >Any help is appreciated.
>> >
>> >Thanks,
>> >Amit
>> >
>> One way is to write a batch file (since you're on Windows), and
>> execute that with shell=True.
>>
>> It's not the only way, or the most efficient.  But it's most likely
>> to work, without knowing anything more about those two programs.
>>
>> DaveA
>>
>
> Thanks Dave.
>
> That's actually a good idea and in this case probably the only way that
> this would work. I can auto-generate the batch file from the python
> script with the parameters that I need and just execute that with the
> subprocess.
>
> I wish there was a cleaner was as well.
>

Run a shell (cmd.exe, I think) using subprocess and send it the
commands you want to run using the communicate() method.

--
regards,
kushal
From: Amit Uttamchandani on 30 Apr 2010 16:26
On Sat, Apr 24, 2010 at 08:22:14AM +0530, Kushal Kumaran wrote:

[snip]

>
> Run a shell (cmd.exe, I think) using subprocess and send it the
> commands you want to run using the communicate() method.
>

Actually, I ended up using stdin.write('...\n'), and it works as expected:

#
# Set WindRiver environment for VxWorks 6.4
#
wrenv_path = "C:\WindRiver\wrenv.EXE"
args = [wrenv_path, '-p', 'vxworks-6.4']
proc = subprocess.Popen(args,
shell=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE
)
proc.stdin.write(str.encode('wrws_update -data %s -l %s -b clean\n' %
(workspace, self.target)))
output, error = proc.communicate()
print(output)
print(error)

You can keep using stdin.write until you call communicate() this allows
you to write certain commands to the stdin for the process you launched.
Note: wrenv.exe is actually a shell like cmd.exe.

The above code is written for Python 3.1.

Thanks for the help.
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