[Tutor] (no subject)(About Pipe)

[沈洁元]

Hello, KTPR
    I've read your code.  May the main problem locates at "cmd".  Assume 
that foo.py and listen.py are at the same directory.  It should look like:
cmd='python listen.py'
    or if you included '#!/usr/bin/python' (Linux) or 
'#!/usr/local/bin/python' (FreeBSD) as the first line in listen.py and 
you changed mode of listen.py to a+x
cmd='./listen.py'
    or even if you are now in some one of PATH
cmd='listen.py

Maybe it hits the point.  Just maybe, because you didn't give your output.
Here is an example code, it really works at least.
-----------foo.py--------------
import popen2

cmd='python listen.py'
(pout,pin)=popen2.popen2(cmd)
pin.write('Here is a message from pipe.')
pin.close()
got=pout.readlines()
pout.close()
print '\n'.join(got)

---------listen.py-----------
try:
    uh=raw_input("Write this through pipe: ")
#Write this to stdin, so uh should have message
except EOFError:
    print 'No message.'
else:
    print uh
----------------------------------

    Juan Shen

ktpr wrote:

>Hi all,
>
>I am trying to supply input to another program using
>pipes. I can read from it just fine, but writing to
>its stdin doesn't seem to be working. 
>
>foo.py (gets pipe to listen.py)
>---
>from popen2 import popen2
>
>cmd = "listen.py"
>
>#stdout, stdin
>r, w = popen2(cmd)
>
>w.write("Message sent")
>
>w.close()
>
>got = r.readlines()
>r.close()
>
>for line in got:
>    print line
>
>---
>listen.py
>---
>import sys
>
># wrote to this stdin, so uh should have message
>uh = raw_input("why doesn't it")
>
>if "" != uh:
>    print "go here?"
>
>if "" == uh:
>    print "or even here?"
>
>---
>
>I know I'm missing something conceptual...
>
>I only get "why doesn't it" printed to the screen and
>the message didn't seem to transfer across the pipe,
>as listen.py aborted before the if statement somehow.
>Any and all help would be appreciated; popen2._test()
>works fine ...
>
>cheers
>ktpr
>
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