[Tutor] CGI-version not working while similar command-line script is fine

[Kent Johnson]

Ah. I tried it in IDLE and had the same problem. Using popen4() to look at 
stderr, I found that lynx is not finding the .cfg file. Adding that to the 
command line made it work:
 >>> i,o=os.popen4(r'C:\Downloads\Apps\LYNX\LYNX.EXE -dump 
http://www.google.com')
 >>> o.read()
'\nConfiguration file ./lynx.cfg is not available.\n\n'

 >>> os.popen(r'C:\Downloads\Apps\LYNX\LYNX.EXE 
-cfg=C:\Downloads\Apps\LYNX\LYNX.CFG -dump http://www.google.com').read()
"                                   Google\n\n    Web    [1]Images 
[2]Groups    [3]News    [4]Froogle    [5]more 
\xaf\n\n     [6]_______________________________________________________\n 
[7]Google Search [8]I'm Feeling Lucky   [9]Advanced 
Search\n     [10]Preferences\n     [11]Language 
Tools\n\n    [12]Advertising Programs - [13]Business Solutions - [14]About 
Google\n\n              \xa92004 Google - Searching 4,285,199,774 web 
pages\n\nReferences\n\n   1. 
http://www.google.com/imghp?hl=en&tab=wi&ie=UTF-8\n   2. 
http://www.google.com/grphp?hl=en&tab=wg&ie=UTF-8\n   3. 
http://www.google.com/nwshp?hl=en&tab=wn&ie=UTF-8\n   4. 
http://www.google.com/froogle?hl=en&tab=wf&ie=UTF-8\n   5. 
http://www.google.com/options/index.html\n   6. form field = text entry 
field\n   7. form field = submit button\n   8. form field = submit 
button\n   9. http://www.google.com/advanced_search?hl=en\n  10. 
http://www.google.com/preferences?hl=en\n  11. 
http://www.google.com/language_tools?hl=en\n  12. 
http://www.google.com/ads/\n  13. http://www.google.com/services/\n  14. 
http://www.google.com/about.html\n"
 >>>

So try adding the -cfg switch to specify your lynx.cfg. If that doesn't 
work use popen3 or popen4 to capture stderr and see what is there.

Kent

At 09:19 AM 9/6/2004 +0100, Gerhard Venter wrote:
>Hi Kent
>
>No, although I did not have the "http://" in my email, I did enter it in
>my web form.  So it isn't that.   (And my version of Lynx doesn't
>require it)
>
>But the interesting thing is that the line below which you suggested
>works in a Python command prompt, but not in Idle or Pythonwin.
>Perhaps CGI has the same limitation as these tools.
>print os.popen(r'c:\bin\lynx.exe -dump http://www.google.com').read()
>
>Likewise (I've resorted to using a temp file, but even that isn't
>working), the line below works in a Python command prompt but not in CGI.
>os.system(r'start /B c:\bin\lynx.exe -dump http://www.google.com >
>"F:\logs\temp.txt"')
>
>Gerhard
>
>
>
>Kent Johnson wrote:
>
>>I just tried this with Lynx Version 2.8.4rel.1-mirabilos:
>> > lynx --dump www.google.com
>>
>>I didn't get any output. If I try
>> > lynx --dump http://www.google.com
>>then it works. Could it be that simple?
>>
>>Also this works for me:
>> >>> import os
>> >>> print os.popen(r'C:\Downloads\Apps\LYNX\LYNX.EXE -dump 
>> http://www.google.com').read()
>>
>>Kent
>>
>>At 05:08 PM 9/5/2004 +0100, Gerhard Venter wrote:
>>
>>>Hi Kent
>>>
>>>Thanks - my code is below.  It should output a plain text version of any 
>>>website
>>>
>>>G
>>>
>>>Kent Johnson wrote:
>>>
>>>>This should work. My guess is you have an error in your script, maybe a 
>>>>problem with quoting or string substitution. Can you show us the script 
>>>>that is having trouble?
>>>
>>>import cgi, os
>>>import cgitb; cgitb.enable()
>>>
>>>form = cgi.FieldStorage()
>>>website = form["websitename"].value
>>>command = 'lynx --dump ' + website
>>>k=os.popen(command, 'r')
>>>
>>>print 'Content-type: text/plain'
>>>print
>>>
>>>#print command  (this shows the right thing- for example lynx --dump 
>>>www.google.com)
>>>for line in k.readlines():
>>>      print(line)
>>>_______________________________________________
>>>Tutor maillist  -  Tutor at python.org
>>>http://mail.python.org/mailman/listinfo/tutor
>>
>>
>
>_______________________________________________
>Tutor maillist  -  Tutor at python.org
>http://mail.python.org/mailman/listinfo/tutor