On Monday, February 25, 2013 9:29:54 AM UTC-8, MRAB wrote:
> On 2013-02-25 17:02, chris.an...@gmail.com wrote:
>
> > Hello, ive been struggling with this for a couple weeks now and was hoping
> > someone might be able to help. I have an older Cognex camera that I need
> > to communicate with via telnet. I can get a response from the camera when
> > I initiate a telnet session but I dont seem to get any response when I
> > write the user name to the camera - I havnt been able to get any response
> > writing anything. Im using python 2.7 and windows xp. here is the code:
>
> > [code]
>
> >>>>import sys
>
> >>>>import telnetlib
>
> >>>>HOST = "10.31.18.21"
>
> >>>>USER = "admin"
>
> >>>>tn = telnetlib.Telnet(HOST)
>
> >>>>tn.read_until("Login: ")
>
> > "Welcome to In-Sight(R) 4001 Session 1\r\nUser:"
>
>
>
> The returned string ends with "User:", presumably the prompt to enter
>
> the username, which makes we wonder whether you should be reading until
>
> "User:" instead of until "Login: ".
>
>
>
> >>>>tn.write(USER + "\r\n")
>
>
>
> Should you be ending that with just "\r" or just "\n" instead? (That
>
> would be equivalent to typing the username and then pressing the Return
>
> key.)
>
>
>
> >>>>tn.read_until("User: ")
>
>
>
> Haven't you already seen "User: "?
>
>
>
> > Traceback (most recent call last):
>
> > File "", line 1, in
>
> > File "C:\Python27\lib\telnetlib.py", line 319,
>
> > return self.read_very_lazy()
>
> > File "C:\Python27\lib\telnetlib.py", line 395,
>
> > raise EOFError, 'telnet connection closed'
>
> > EOFError: telnet connection closed
>
> >>>>
>
> > [\code]
>
> >
>
> > if i do a read_all instead of read_until for user I just get "..."
> > returned. Im assuming tn.write command isnt working? any help would be
> > greatly appreciated.
>
yea you are right I shouldnt be doing read_until("User: ") I tried
read_until("Password: ") instead but didnt make any difference. If I use
read_all() I just get ,,, like there is nothing to read. in hyperterminal I
had to set the “Send Line Ends with Line Feeds” option for it to work. I
thought by using "\r\n" would emulate the same thing?
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