subprocess problem

[Do Re Mi chel La Si Do]

Hi!

This script (under Win-XP + P-2.4.1) :
     import subprocess
     p1=subprocess.Popen(r'cmd /cdir *.* /S /W /B', stdout=subprocess.PIPE)
     chaineretour=p1.stdout.read()

run OK if called from DOS-console. But, from another Python's script (by COM
+ exec) give me an error.

Here, the traceback :

Traceback (most recent call last):
 File "D:\dev\Python\ponx.py", line 4446, in PRun
  exec(ccod,globals(),globals())
 File "C:\Python24\lib\subprocess.py", line 546, in __init__
   (p2cread, p2cwrite,
 File "C:\Python24\lib\subprocess.py", line 606, in __get_handles__
   p2cread =  self._make_inheritable(p2cread)
 File "C:\Python24\lib\subprocess.py", line 647, in _make_inheritable
   DUPLICATE_SAME_ACCESS)
error: (6, 'DuplicateHandle','Descripteur non valide')


I know the bug-signaled : http://python.org/sf/1124861


But... a idea for a solution ?

Thanks, and sorry for my bad english.


Michel Claveau