General Discussion - Performance when adding text elements

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Performance when adding text elements

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: General Discussion
Forum Description: Discussion board for Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=3240
Printed Date: 22 Nov 24 at 11:10PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Performance when adding text elements

Posted By: x3mike
Subject: Performance when adding text elements
Date Posted: 04 Jan 16 at 4:54PM

Hello,

I have to "watermark" existing PDF documents with some text elements. The process take a really long time.

For some tests I used this document I googled in the internet: http://scholar.princeton.edu/angelab/publications/super-large-pdf-100mb" rel="nofollow - http://scholar.princeton.edu/angelab/publications/super-large-pdf-100mb

What I do:

create TMemoryStream and load the data into it
create a TQuickPDF instance and load the document from the memorystream
Iterate each page, select it and add two text elements
save the document back to the stream and save the stream to a file

On my machine this process takes 80 seconds!

How can I speed up the process? This kind of PDF-processing is used on a WebServer which dynamically adds user data to the delivered PDF. A processing time of average 40seconds totally blocks the server ...

Thank you for your help!

Best regards,
Michael

Replies:

Posted By: Ingo
Date Posted: 07 Jan 16 at 8:49PM

Hi Michael,

do you think it's faster to do the first two steps instead of using an easy LoadFromFile (into memory as well)?

The same for the last step: An easy SaveToFile should be faster.

But all this saves time at the beginning and at the end. Most of the time will be consumed while working on the pages.

Here's a sample from the Debenu-knowledgebase about watermarking. If you do it the same way i fear there's no further time save option:

http://www.debenu.com/kb/programmatically-add-watermark-stamp-pdf/

BTW: A 100-mb-file on disk could be a much bigger file if it's loaded and structured into the memory.

Cheers and welcome here,

Ingo

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Cheers,
Ingo