Thanks you all for you contributions
I have decided to break down the pdf files into individual jpg pages and
serve them that way. I plan on putting each document in its own folder
and then have the individual pages listed within the folder. I haven't
worked out the exact retrieval scheme yet but it will probably be
something like:
Documents
Document 1
; :
; jpg 1
: :
: jpg n
;
Document n
This should work and allow fast recovery.
Thanks again for your help
Gary R
On 09/04/2016 05:37 AM, Avraham Serour wrote:
if you need to server the pdf then it will be downloaded to the user
computer, even if you are visualizing in browser with js.
What you can do is show screenshots of the pdf pages, then you would
be serving individual jpgs for each page and not a single 100mb file.
You can create previews for each page using something like imagemagick
as mentioned before and create a layout to view that using django
template.
On Sun, Sep 4, 2016 at 9:52 AM, <[email protected]
<mailto:[email protected]>> wrote:
Hello,
Maybe you could use ImageMagick to show one page of the pdf as an
image ? This is what I have implemented on my project : first page
of pdf files can be pre-viewed before user uploads the whole file
(if needed). In your case, pre-viewing could be parametrized to
show page ‘n’ of the pdf file, probably. In my project,
pre-viewing image is generated when pdf file is uploaded and saved
by admin in myproject/media/files directory. Once pdf files are in
media directory, users can preview those pdf files and tnen upload
them, if needed (only first page can be pre-viewed by user. This
is an implementation choice).
http://www.imagemagick.org/script/index.php
<http://www.imagemagick.org/script/index.php>
<http://www.imagemagick.org/script/index.php>
Implementation principles/credit can be found here :
http://www.yaconiello.com/blog/auto-generating-pdf-covers/
<http://www.yaconiello.com/blog/auto-generating-pdf-covers/>
<http://www.yaconiello.com/blog/auto-generating-pdf-covers/>
I am attaching the signals file_post_save file_pre_save, for
information.
Cheers.
Django 1.8
Python 3.4
Note : to install ImageMagick:
sudo apt-get install libmagickwand-dev imagemagick libmagickcore-dev
The convert command allows to convert any page of pdf file into
png image (for instance), eg :
convert -thumbnail 1280 test.pdf[0] test_1280.png
Several parameters exist to tune image quality (in my case, need
to use density, trim and quality).
*models.p**y*
[…]
###########
# SIGNALS #
###########
from django.db.models.signals import post_save, pre_delete
from django.dispatch import receiver
from myproject.settings import MEDIA_ROOT
import subprocess
# What to do after a File is saved - receiver definition
def file_post_save(sender, instance=False, **kwargs):
# This post save function creates a thumbnail for the File
file = File.objects.get(pk=instance.pk <http://instance.pk>)
command = "convert -density 300 -trim -thumbnail %s %s%s[0]
-quality 100 %s%s" % (file.thumbnail_size, MEDIA_ROOT, file.file,
MEDIA_ROOT, file.thumbnail)
proc = subprocess.Popen(command,
shell=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
stdout_value = proc.communicate()[0]
post_save.connect(file_post_save, sender=File,
dispatch_uid="file_post_save_uid")
# What to do before a File is deleted - receiver definition
def file_pre_delete(sender, instance=False, **kwargs):
# This pre delete function deletes file and thumbnail from media
directory
file = File.objects.get(pk=instance.pk <http://instance.pk>)
command = "rm %s%s %s%s" % (MEDIA_ROOT, file.file, MEDIA_ROOT,
file.thumbnail)
proc = subprocess.Popen(command,
shell=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
stdout_value = proc.communicate()[0]
pre_delete.connect(file_pre_delete, sender=File,
dispatch_uid="file_pre_delete_uid")
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