[Zope] Accessing .gif on disk with Python Product?

[Martijn Pieters]

On Mon, Aug 07, 2000 at 01:12:03PM -0300, Performance.net Strategic Internet Solutions wrote:
> > On Mon, Aug 07, 2000 at 11:21:53AM -0300, Performance.net Strategic
> > Internet Solutions wrote:
> > > I am writing a python product and want to display a GIF file in some of
> > > the manage_pages. It is not meant to be the "icon" property of the
> > > class, just an image to be included in DTML. I included it in my class
> > > as follows:
> > >
> > >   chooser = ImageFile('images/chooser.gif',globals()),
> > >
> > > but when I call it in DTML (<dtml-var chooser>) I get the following:
> > >
> > >     <ImageFile instance at 014F1D90>
> > >
> > > I thought maybe I could use an instance of the Image class:
> > >
> > >   chooser = OFS.Image('images/chooser.gif',globals()),
> > >
> > > but this doesn't seem to work.
> > >
> > > How do you create an instance of an Image in a Python Product?
> >
> > ImageFile objects do not (like ZODB stored Image objects) generate an IMG
> > tag when called. Image object, when called, generate an IMG tag that
> > points the browser to the correct address to retrieve tha actual image.
> >
> > With an ImageFile object, you need to construct the tag yourself. If this
> > class has an instance foo, with this ImageFile attribute chooser, and the
> > instance foo is stored in the root of your Zope ZODB, you need to point
> > the browser to http://yoursever/foo/chooser. So your DTML needs to
> > generate the following HTML:
> >
> >   <img src="http://yoursever/foo/chooser">
> >
> > I don't know enough about your DTML, but if it is another attribute of the
> > same class, you could use one of the URLx REQUEST variables or something
> > to construct the URL for the image. Also, absolute_url() called on the foo
> > instance may also work for a base URL.
> >
> > Hope this helps.
> 
> Okay, I've done the following:
> 
> # Create the method in the .py Class File
> chooserIcon=ImageFile('images/chooserIcon.gif',globals()),
> 
> # Call from the .dtml File <img src="<dtml-var absolute_url>/chooserIcon"
> border=0>
> 
> absolute_url() works and the URL points correctly to
> http://myserver/foo/chooserIcon, but  if I type in that URL directly, I get
> a "Not Found" error as though the method does not exist. I've double-checked
> that the image is there and named correctly, so it's not a syntax thing.
> 
> Perhaps I need to convert it to an "Image" object something like below?
> 
>     # this doesn't work but illustrates the idea chooserIcon = Image(
>     ImageFile('images/chooserIcon.gif',globals() )
> 
> Help! =:)

Hmm.. This is how Product Icons are stored, that is, as ImageFile objects. At
product init time, a ImageFile objetcs is created for the Product icon and
stroed in the special misc_ structure for later access.

Have a look through the Product initialisation code, which is started up in
OFS/Application.py::install_products().

-- 
Martijn Pieters
| Software Engineer            mailto:mj@digicool.com
| Digital Creations          http://www.digicool.com/
| Creators of Zope               http://www.zope.org/
| ZopeStudio: http://www.zope.org/Products/ZopeStudio
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