[Zope] Generating and Downloading PDF

[Chris McDonough]

On Fri, 2005-02-25 at 21:24, Paul Winkler wrote:
> On Sat, Feb 26, 2005 at 12:14:11AM +0100, robert wrote:
> 
> >        R = self.REQUEST.RESPONSE
> >        R.setHeader('content-type', 'application/rtf')
> >        R.setHeader('content-length', str(len(data))
> >        R.write(data)
> 
> That's great if you're serving PDFs that
> you can easily fit in RAM and throw away after the request.
> e.g something customized for each viewer.
> 
> Or, if the PDFs are likely to be large, and you can
> reuse them, and you have space on the filesystem for them,
> and you want the fastest possible data stream 
> Zope can deliver to the client while minimizing RAM
> usage, you could do something like (for zope later than 2.7.2 or so, 
> I forget exactly which version):
> 
> 
>     # untested! 
>     # doesn't provide cleanup of files!
> 
>     from ZPublisher.Iterators import filestream_iterator
>     response = self.REQUEST.RESPONSE
>     if not file_i_want_to_serve_exists:
>          # ... write the file somewhere.
>          # Bonus points if you can figure out how to start streaming it
>          # while you're still writing it, but that may be 
>          # non-trivial.
> 
>     # Once the file's written, hand it off to the publisher
>     # for efficient streaming.
>     response.setHeader('content-type', 'application/pdf')
>     response.setHeader('content-length', the_length)
>     response.setBody(filestream_iterator(filename)) 


Actuall, it's not "response.setBody" in the last line, it's just "return
filestream_iterator(filename)".

- C