Here's a c routine that prints a single line : #include <stdio.h> main() { printf ("Hello World!\n"); }
And now the Python program (called 'po.py') that uses 'popen2' : import popen2 (fin, fout) = popen2.popen2(r'c:\home\hw.exe', -1, 't') print fin.readline() fin.close() fout.close() When this is run it properly outputs the one line from the c routine : C:\>python c:\python\po.py Hello World! Now here is my attempt to use the 'subprocess' module : from subprocess import * p = Popen(r'c:\home\hw.exe', bufsize=-1, stdin=PIPE, stdout=PIPE, universal_newlines=True) fin = p.stdin print fin.readline() fin.close() When this is run, I get no output : C:\>python c:\python\sp.py C:\> As you can see, I get no exception. I've tried various combinations of the Popen arguments with no joy. The platform is Windows XP Pro, so I did not try things like 'close_fds'. What am I missing ? Daniel Klein -- http://mail.python.org/mailman/listinfo/python-list