ruby on rails - Minimagick gem fails to convert multipage PDF to several png images -


i new ror , i'm trying develop slide sharing app through users can upload , share multipage pdfs containing deck of slides (one slide per page). viewers can view these slides on "show" page.

behind scenes trying convert multipage pdf several .png files (1 pdf page -> 1.png file), , display them in carousel/slider fashion.

here uploader:

# encoding: utf-8  class docuploader < carrierwave::uploader::base  # include rmagick or minimagick support: # include carrierwave::rmagick   include carrierwave::minimagick  # choose kind of storage use uploader:   storage :file # storage :fog  # override directory uploaded files stored. # sensible default uploaders meant mounted:   def store_dir   #  'public/doc_uploads/'     "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"   end    process :filename   process :generate_png    def generate_png     pdf = minimagick::image.new(self.file.path)     pdf.pages.each_with_index |page, index|       page.write("page#{index}.png")     end   end    # add white list of extensions allowed uploaded.   # images might use this:     def extension_white_list       %w(pdf)     end    # override filename of uploaded files:   # avoid using model.id or version_name here, see uploader/store.rb details.   def filename     'doc.pdf' if original_filename   end  end

when try upload multipage pdf document, throws me error: 'identify /public/uploads/tmp/1443619784-406-3861/doc.pdf' failed error: @ line pdf.pages.each_with_index |page, index|

i have tried different solutions converting document, none of them have worked me far. why run of mill .pdf file fail minimagick's validation? there can avoid running issue? advice appreciated!


Comments

Post a Comment

Popular posts from this blog

html - Outlook 2010 Anchor (url/address/link) -

i'm trying link specific pdf page msoutlook'10 or msword'10, #page=... anchor particularly useful , works fine elsewhere. unfortunately when click [ctr-k] in outlook or winword, links re-formatted assuming unc path. pdf file located on shared drive. using "file:" prefix links open pdf in adobe reader (outside of browser), , "http:" open inside browser. issue seem need open in browser "file:" prefix in order anchor work. know anchors work inside browser. outlook uses windows/explorer default program (based on file extension) seems open in adobe reader neglecting anchor. is aware of solution, link specific page or bookmark of shared-pdf ms outlook and/or winword link? common references: mailermailer.com/...anchor-tags-html-emails campaignmonitor.com/...anchor-links-in-email-newsletters/ stackoverflow.com/...anchor-in-pdf-document
Read more

javascript - Why does running this loop 9 times take 100x longer than running it 8 times? -

consider code: test = function() { } t = new test(); (var = 0; < 8; i++) { result = t instanceof test; } if change number of iterations 8 9 , loop take 100 times longer complete in latest version of firefox (41.0.1). tested on 2 different pcs , magic limit 8. here jsperf test used: http://jsperf.com/instanceof-8-times-vs-9-times does have idea why might happen? seems specific instanceof . not happen if else object, example check property. note: filed bugzilla bug this. jan de mooij mozilla team has posted details in bugzilla thread . here's simplistic interpretation of highly technical answers: in i < 8 case, firefox smart enough hoist result = t instanceof test; statement out of loop (according tests, doesn't seem omit altogether). in i < 9 case, apparently doesn't optimization . why? reason not clear, related fact 9 iterations threshold above function considered "hot" enough run through jit compiler. i < 8 cas...
Read more

Getting gateway time-out Rails app with Nginx + Puma running on Digital Ocean -

following this guide setup app on digital ocean droplet, not working. site not loading , it's throwing: "gateway time-out". the puma server works, since ps aux | grep puma prints: root 15878 0.0 0.4 376832 2168 ? sl 12:50 0:00 puma 2.13.4 (unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock) [20150930164940] root 15881 0.0 0.7 903676 3692 ? sl 12:50 0:06 puma: cluster worker 0: 15878 [20150930164940] root 24654 0.0 0.1 11748 916 pts/2 s+ 18:00 0:00 grep --color=auto puma my nginx config: user root; worker_processes 1; events { worker_connections 1024; } http { upstream puma { server unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock; } server { listen 80; server_name myapp.com; root /var/www/myapp/current/public; access_log /var/www/myapp/current/log/access.log; error_log /...
Read more