Mike Hansen
Mike.Hansen at atmel.com
Mon Oct 16 18:43:29 CEST 2006 > This is a peace of a CGI script i have.
>
> 1 import cgi
> 2 form=cgi.FieldStorage()
> 3 try :
> 4 ano=form["ano"].value
> 5 conta=form["conta"].value
> 6 except KeyError :
> 7 print '<html><br><br><body><p>Please enter values in the
> fields</p></body></html> '
> 8 sys.exit(0)
>
>
> When the excption occurs, no message is shown on the browser.
>
> If I run the script with IDLE, the message is printed and then the
> script exits.
>
> What's wrong here?
>
>
>
> _______________________________________________
> Tutor maillist - Tutor at python.org > http://mail.python.org/mailman/listinfo/tutor >I'm catching up on the weekend's tutor messages.
import cgitb; cgitb.enable()
That spits errors to the web page which is great for debugging cgi
scripts.
I think you need
print "Content-Type: text/html\n\n"
http://docs.python.org/lib/cgi-intro.html http://docs.python.org/lib/node560.html Mike
Thats not the point (sorry).
when all the values are provided in the form (no excetion is raised) it runs as expected!
The point is when one of the values "ano", "conta" is missing in the form, I want the error message to be shown on the browser, and the script to stop running.
When there is an exception, the script actually stops running, but no message is sent to the browser.
Actually, this is the point. The first lines of output from your CGI script, even on an error, needs to be header information to the web server and to the web browser, then a blank line, and then the content to be displayed (text, html, image, etc.). If you don't include the "print 'Content-type: text/html\n'" line that Mike suggests, then your HTML will be swallowed by the system as configuration information (and erroneous information at that).
Mike suggested some webpages to review. It might be good to pour over them to learn more about the CGI protocols.
-Arcege
--
There's so many different worlds,
So many different suns.
And we have just one world,
But we live in different ones.
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