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Newsgroups: comp.lang.python
Date: Mon, 25 Feb 2013 11:42:15 -0800 (PST)
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Subject: Re: telnet to Cognex In-Sight 4001 camera
From: chris.annin@gmail.com
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yes, ive connected successfully using hyperterminal after I login it asks f=
or user and I type admin press enter then it ask for password and type pass=
word press enter and it all works fine. using python ive tried ending both =
with "\n" and "\r\n" im thoroughly confused  =20




On Monday, February 25, 2013 11:24:22 AM UTC-8, square.steve wrote:
> At the risk of stating the blindingly obvious, have you run a 'real' teln=
et session to see what =A0a successful conversation looks like? Might give =
you some useful pointers for your debug session.
>=20
>=20
> Steve
>=20
>=20
>=20
> Sent from a Galaxy far, far away.... =20
>=20
>=20
> -------- Original message --------
> From: chris...@gmail.com=20
> Date: =20
> To: pytho...@python.org=20
> Subject: telnet to Cognex In-Sight 4001 camera=20
> =20
>=20
> Hello,=A0 ive been struggling with this for a couple weeks now and was ho=
ping someone might be able to help.=A0 I have an older Cognex camera that I=
 need to communicate with via telnet.=A0 I can get a response from the came=
ra when I initiate a telnet session but I dont seem to get any response whe=
n I write the user name to the camera -=A0 I havnt been able to get any res=
ponse writing anything. Im using python 2.7 and windows xp.=A0 here is the =
code:
> [code]
> >>>import sys
> >>>import telnetlib
> >>>HOST =3D "10.31.18.21"
> >>>USER =3D "admin"
> >>>tn =3D telnetlib.Telnet(HOST)
> >>>tn.read_until("Login: ")
> "Welcome to In-Sight(R) 4001 Session 1\r\nUser:"
> >>>tn.write(USER + "\r\n")
> >>>tn.read_until("User: ")
> Traceback (most recent call last):
> =A0 File "<stdin>", line 1, in <module>
> =A0 File "C:\Python27\lib\telnetlib.py", line 319,
> =A0=A0=A0 return self.read_very_lazy()
> =A0 File "C:\Python27\lib\telnetlib.py", line 395,
> =A0=A0=A0 raise EOFError, 'telnet connection closed'
> EOFError: telnet connection closed
> >>>
> [\code]
>=20
> if i do a read_all instead of read_until for user I just get "..." return=
ed.=A0 Im assuming tn.write command isnt working?=A0 any help would be grea=
tly appreciated.
>=20
> thank you
>=20
> Chris
> --=20
> http://mail.python.org/mailman/listinfo/python-list