[Zope] Render image from external method.
tino at wildenhain.de
Thu Feb 16 02:08:26 EST 2006
Jason C. Leach schrieb:
> I'm wondering how I can render an image from an external method
> without creating a permanent image object in Zope? What I have is a
> python script I call in my ZPT. The python script does some things,
> and calls an external method that returns PNG image data. If I do
> tal:attributes="src python:python_script()" What I get is the string
> containing the PNG image data, but it's not rendered.
> An example of what I get is: <img src="?PNG <PAGE OF BINARY DATA>" />
> Any ideas? I don't really want to create a permanent image object,
> and I know that will work because I have used it to create thumbnail
> images before.
Yes, you have to link to the image in your HTML code - just like
any other image you see. (Only a small popolation of browsers
support inline images - and these only really work for fairly small
images - so this isnt an option for you I guess)
<img src="/path/to/your/script" width... height... alt... />
If you need parameters to render the image, either put them
into the URL (ZTUtils.make_query() can help here) or
in the SESSION.
Btw, you might be confused by zopes Image objects which behave
in a dual way. When "called" inside your template, they output
a HTML image-tag with a link to their URL. Accessing the URL
however, produces the binary data of that image.
More information about the Zope