[Tutor] Replacing keyboard input to EXE file

[Wayne]

On Thu, Jun 11, 2009 at 3:08 AM, Alun Griffiths <
alun.griffiths at dsl.pipex.com> wrote:

> Hi
>
> I have a legacy (FORTRAN) program called POLY.EXE which asks the user
> interactively for three inputs (file names) from the keyboard.  I would like
> to run this program in batch and tried to replace the interactive prompts
> with file names stored in a separate file using this Python script:
>
> import subprocess
>
> try:
>    poly_file = file("poly_files.txt","r")
> except:
>    print "Could not open input file"
> else:
>    x = subprocess.Popen(args="poly.exe", stdin=poly_file)
>    x.wait()
>
> poly_files.txt contains the three file names as follows:
>
> polyin.dat
> polyout.dat
> polyout.plt
>
> On execution, I get these error messages
> Traceback (most recent call last):
>  File "C:/Projects/Active/Alun/test_poly.py", line 4, in -toplevel-
>    x = subprocess.Popen(args="poly.exe", stdin=poly_file)
>  File "C:\Python24\lib\subprocess.py", line 533, in __init__
>    (p2cread, p2cwrite,
>  File "C:\Python24\lib\subprocess.py", line 607, in _get_handles
>    c2pwrite = self._make_inheritable(c2pwrite)
>  File "C:\Python24\lib\subprocess.py", line 634, in _make_inheritable
>    DUPLICATE_SAME_ACCESS)
> WindowsError: [Errno 6] The handle is invalid
>
> So, it looks like something is wrong with the way I am redirecting stdin,
> but I have no idea what the problem is.  Any suggestions gratefully received
>

I've not done much with subprocess, but I know you can use the
subprocess.PIPE to redirect stdin/stdout.

This may be of some help too,
 http://www.oreillynet.com/onlamp/blog/2007/08/pymotw_subprocess_1.html

-Wayne
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