Hi Tim,
Have you looked at ERAttachment? It has been designed to do exactly
what you are attempting and optionally ties into the AjaxFileUpload
component.
"The framework provide a single unified set of components and models
that can allow the storage of attachments on your local filesystem,
served through your webserver; on your local filesystem served
through a custom request handler; in your database, served through a
custom request handler; and on Amazon's S3 service, served directly
from S3. The intent of the framework is to make it very simple to
control how the attachments are stored and served by simple adjusting
some configuration properties."
It also has attachment viewer components. Save yourself some time,
use ERAttachment.
http://webobjects.mdimension.com/hudson/job/Wonder53/javadoc/er/
attachment/package-summary.html
David
On 23-Sep-09, 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. 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.
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?
Thanks for your help.
Tim
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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