[Zope] Question about accessing properties of images

[Kevin Carlson]

Dieter,

Thank you very much for your reply!  I renamed the images and it works
great!

Kevin

----- Original Message -----
From: "Dieter Maurer" <dieter@handshake.de>
To: "Kevin Carlson" <kevinc@carlson.homeip.net>
Cc: <zope@zope.org>
Sent: Saturday, February 23, 2002 6:15 AM
Subject: Re: [Zope] Question about accessing properties of images


> Hi Kevin,
>
> Kevin Carlson writes:
>  > Here you go -- hope this helps.  I'm running Zope 2.5 if that helps
any.  A
>  > little explanation about the structure of the site may help, too.
>  >
>  > The pic object I have sent you is a thumbnail image of a much larger
image.
>  > The larger images reside in a subdirectory called "largepics" and have
the
>  > same names.  When a user clicks on one of the hyperlinks that is
associated
>  > with the pic object, I send the id of the pic object to a DTML method
called
>  > "photo_html". (All of this occurs in the folder containing the
thumbnails).
>  > This method displays the larger picture from the subdirectory and pulls
the
>  > description from thumbnail.  I put the site together this way so that I
>  > could have an admin page to be able to type descriptions for multiple
>  > thumbnail pictures at one time.
>  >
>  > I also tried adding the description to the larger image object but had
the
>  > same type of results.
>  >
>  > Thanks for your interest in looking at this.  I anxiously await your
reply!
> I imported your image, created the following DTML Method
>
> <dtml-var standard_html_header>
> <h2><dtml-var title_or_id> <dtml-var document_title></h2>
> <p>
> <dtml-var expr="_.getitem('01').desc">
> </p>
> <dtml-var standard_html_footer>
>
> and viewed it. Of course, I saw the description.
>
>
> I can see 2 potential problems causing your failure:
>
>   1.  Your image's name is valid in URL's and DTML but not
>       in Python expressions (where you are inside "...").
>       Inside Python, "01" is not an object but the integer 1
>       (the leading "0" is intepreted as "octal number").
>       Integers do not have attributes.
>
>       The "_.getitem" above accepts arbitrary names and
>       looks them up transparently in the DTML namespace.
>       (read the "Name lookup section" in
>
>         <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html>
>
>        when your want to learn more about namespaces and lookup).
>
>   2.  Where you use "pic.desc", there may be "dtml-with" active
>       (to facilitate access to the "largspics"). In this case,
>       your "pic" may be the large image, not the thumbnail.
>
>       In this case, you would probably use a nested "dtml-with"
>       to access your thumbnail.
>
> I expect, your problem is 1.
>
>
> Dieter