Hi,
On Mon, 2007-04-30 at 22:23 +0200, Maciej Wisniowski wrote:
> > class StudentDetails:
> > """Helper to return a student photo."""
> > def getPhoto(self):
> > student = self.context
> > return StudentPhoto(student)
> >
> > In my page template, I can see that the IImage object is being created
> > correctly..
> >
> > <div tal:define="photo view/getPhoto">
> > <span tal:content="photo">#</span>
> > </div>
> >
> > gives me <zope.app.file.image.Image object at 0xb75c6c6c>. But to turn this
> > object into a URL so that I can put it in an <img> tag is beyond me. When I
> > try to do an @@absolute_url on the photo object I get the error saying
> > there's not enough context.
> >
> > Am I going about this the wrong way? Is there some other thing I need to be
> > doing in order for there to be enough context?
> Hm... not sure if it is good solution but it is just a quick though so
> possibly somebody may give you something better. Maybe there are ready
> solutions for this. In general if you want
> to return image then you have to return it's data to the browser (not
> Image object) and you also have to set proper headers like content-type
> and content-length. I don't remember exactly how it should go but you
> should find examples with google or see how z3c.image does this etc.
> This should be something like:
>
>
> class StudentDetails:
> """Helper to return a student photo."""
> def __call__(self):
> student = self.context
> self.request.setHeader('content-type', 'image/png')
> # determine and set content-length here
> return StudentPhoto(student).data # not sure if it was 'data'
> # check image.py
>
> If you declare this in zcml as:
>
> <browser:view
> name='myphoto'
> class=StudentDetails'
> permission='zope.Public'
> for=.....
>
> then you may use url just like:
>
> student_object/myphoto
>
> and this will execute __call__ method of the view class.
>
Maciej's code should do it for you but will need to be a browser view:
class StudentPhotoView(BrowserView):
etc
<browser:view
name='myphoto'
class=StudentPhotoView'
permission='zope.Public'
for=IStudent />
Also take a look at zope.app.file.browser.image.py for ImageData which
takes the trouble to set the correct headers (which Maciej also
implies).
Hope this helps.
Darryl