General Discussion - DACapturePage Reliability

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DACapturePage Reliability

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=729
Printed Date: 23 Nov 24 at 4:04AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: DACapturePage Reliability

Posted By: brandon
Subject: DACapturePage Reliability
Date Posted: 16 May 07 at 3:19PM

I have been using QuickPDF for a few years now and I understand the complexities of extracting text, memory issues, rendering etc. To be honest, I would not want to depend on QuickPDF for certain functions (especially rendering).

But, for those who have the source code (and understand it), how reliable is DACapturePage? I am considering using it in an automated environment with a wide variety of PDF's to handle imposition. I just don't want to go down that path if DACapturePage (and DADrawCapturedPage) is a complex portion of the code and cannot be relied upon.

Thanks in advance,

Brandon

Replies:

Posted By: brandon
Date Posted: 29 May 07 at 12:29PM

Well, I got no response so I'll respond to myself. I have tested about 50 different PDF's generated from several different applications. So far only 1 PDF was unreadable after processing. Here is what I am doing:

DAOpenFile
DANewPage
DASetPageSize (of new page)
DAFindPage (find 1st page)
DACapturePageEx (1st Page)
DADrawCapturedPage (on new page 2)
DASaveAsFile (give it a new filename)

The one file that is unreadable gives an error when the page is displayed in Acrobat 6 Professional. It say "An unrecognized token 'qqQ' was found." The first time I tried to open the same PDF file with Acrobat Reader 8.0 it crashed completely. The 2nd time I tried it I got an error "Could not find the XObject named 'iSQPCap1'.

The original PDF file is PDF version 1.5 format. It can be opened and printed fine from both Acrobat Pro 6 and Acrobat Reader 8, so I have to assume that QuickPDF is doing something to the file during the capture and draw methods. Anybody want to take a peek at the PDF before and after and see what is going on?

Thanks,

Brandon

Posted By: Ingo
Date Posted: 29 May 07 at 2:50PM

Hi Brandon!

Marian had told it already in another thread...
The DA-functions were made to solve the memory-problems ... with less success. It seems that few DA-function aren't complete identical (inside) to there equivalent function (same name - without DA).
Perhaps you should make another test with the "normal" functions?
BTW: I've never thought that your test would bring this result. I've thought that there were more broken files ;-)

Best regards,
Ingo

Posted By: marian_pascalau
Date Posted: 29 May 07 at 3:05PM

Hi brandon,

I have sayed in another thread that DA* function does not work well with PDF Indirected objects. Please use the normal functions in future, and avoid the DA interface as much as possible.

Thank you Ingo for answering this one.

Best regards, Marian

Posted By: brandon
Date Posted: 29 May 07 at 3:54PM

Thanks Ingo and Marian. My long term goal will be to draw a captured page on to the background of possibly 10,000+ pages. Do you still think normal functions will work or might I have memory issues?

Thanks in advance,

Brandon

Posted By: Ingo
Date Posted: 29 May 07 at 4:02PM

Hi!

Like we can always say:
It depends on ... ;-)
The pages are only one point. How many objects? How many embedded pictures? How many ... How many ...?
I've lots of pdf-files on my disks. Over 90 percent are below 1 mb, 8 percent between 1 and 5 mb and (perhaps) 2 percent up to 262 mb. The 90 percent are fine with QuickPDF... the 8 percent i think "okay... many mbs need much time" ... the 2 percent often needs the task manager ;-) I can live with this and most of my customers, too.

Best regards,
Ingo

Posted By: brandon
Date Posted: 30 May 07 at 1:53PM

Just thought I would give an update. We tested quite a few PDF's using capturepage (normal function - no DA) and we have not found a PDF yet that has caused an issue. Right now we are just capturing page one and drawing it on page two. We don't have any pdf's generated from Acrobat 8.0. I would be curious if there would be any problems.

Regards,

Brandon

Posted By: Ingo
Date Posted: 30 May 07 at 5:25PM

To all members:
Few pdfs made by acrobat 8... with encryption and without encryption... with main password and without... with more than one page...
would be good to have for testing.

If somebody have such files please put it online and post the links here. This could be good for all of us.

Thanks a lot in advance.

Best regards,
Ingo

Posted By: marian_pascalau
Date Posted: 31 May 07 at 9:23AM

Hi there,

despite the answer from Ingo (hope he is not opset with me) I would be glad to receive your PDF files (any format posible).

Please feel free to send me as much documents (PDF 1.7 Version) as you can to quickpdf(at)qmx.net . The solution maybe will not be exposed in public, but through sponsoring it may be another case ;-)

Best regards, Marian

Posted By: Ingo
Date Posted: 31 May 07 at 2:02PM

Marian.
We're all developing for and mainly with QuickPDF.
So to get access to new pdf-files is for us very essential, too.
So again my plea to all: If anybody hase few new pdf-files like i described please upload them for a short time and post the link here. Thanks a lot.
Best regards,
Ingo

Posted By: marian_pascalau
Date Posted: 01 Jun 07 at 5:02AM

Ingo, you are right.

This is the best way of course. ( I was just thinking simpler :-) )