On Sep 23, 2009, at 1:27 PM, Tim Worman wrote:
On Sep 23, 2009, at 10:15 AM, Chuck Hill wrote:
Hi Tim,
On Sep 23, 2009, at 9:24 AM, Tim Worman wrote:
John:
Thanks for the response. In our case the files will always be pdf
since we are requiring that as the format of the originating
user's submission. I can definitely see the file size concern if
the pdf is a big ole glorified image. Hopefully, most of the users
will produce their pdf's by printing to pdf in mac os x (or
acrobat on Windoze).
I already had a component class that takes plain text blobs (logs)
from the database, converts them to pdf, and presents them in a
browser window. That class doesn't work on the blobs where the
file was originated as pdf.
How does it present the converted files?
It implements iText but at some point I will be moving to PDFKit. I
present the text as a PDF in a new window.
The same thing should work with the PDF in a database.
So, I got concerned that maybe I was missing something saving the
NSData. My database saves blobs to the file system so I tried
reading one as a pdf and couldn't. Hence my question.
That might be an artifact of your database (adding extra info). It
could also be that there is some encoding/re-encoding happening
that is scrambling the contents of the file. Which database are
you using?
I'm using OpenBase and I suspect what you're saying is right. It
does cause some worry though since I don't have the review portion
working yet. :-)
You are certain it is a BLOB not a CLOB?
How is the attribute modeled?
Chuck
I've assumed that I should just be able create a response that
simply returns my NSData object and set the proper content-type.
Am I on the right track?
That is what I have always done in the past. It _should_ be simple
and straightforward.
Chuck
On Sep 23, 2009, at 9:02 AM, John & Kim Larson wrote:
Hi Tim,
We do this all the time with receiving reports, prints, etc.
Since the component I use for upload handles any file type
( Word, images, PDF) I keep track of the file extension that the
file was uploaded with in an attribute of my File entity. I then
use that information to reconstitute the mime type when either
embedding or downloading the file. There's not too much magic
there, just a bunch of if elses to get the mime type from the
extension. I can try to help you if that isn't enough info.
Another gotcha is to make sure that your file size doesn't exceed
the blob capacity. PDFs from text are fine, but if someone
uploads a high res scanned file as a PDF, you will get an error
either upon committing the change or upon trying to view the file.
JAL
John A. Larson
President
Precision Instruments, Inc.
Ph: 847-824-4194
Fax: 866-240-7104
Sent from my iPhone
On Sep 23, 2009, at 10:45 AM, Tim Worman <li...@thetimmy.com>
wrote:
WO'ers:
I am writing an application where users can upload pdf files -
which my app saves to the database. I also need to have
mechanisms in place where a "reviewer" can browse the documents
that have been uploaded. The upload and saving to the database
seems to be working. This is modeled as 'blob' and the class
type is 'NSData.' The files are uploaded via AjaxFileUpload.
I have saved plain text files to the database before but I'm
concerned that there is something more I need to do to save the
pdf files. Are there special considerations for maintaining the
mime type, continuity, etc. of these files before I save them as
NSData to the database? Also, I am not sure how to present the
files to the reviewer. I have converted text to pdf for viewing
before but I'm stuck on reconstituting a pdf for display.
If anyone has any pointers or code examples that would really
help me as I'm under a serious time crunch.
Tim
UCLA GSE&IS
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Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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