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>http://www.oreillynet.com/onlamp/blog/2007/08/pymotw_subprocess_1.html
-Wayne
Wayne
I did try using stdin but got the same problem. I also hacked the
following from the website you suggested:
import subprocess
x = subprocess.Popen(args="poly.exe",stdin=subprocess.PIPE)
for item in ["polyin.dat", "polyout.dat", "polyout.plt"]:
x.stdin.write('%s\n' % item)
but got the same error message
Best regards
Alun
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
