use quickpdf with pdf files version 1,5 and 1,6
Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=766
Printed Date: 17 May 24 at 8:22AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com
Topic: use quickpdf with pdf files version 1,5 and 1,6
Posted By: javiermgjs
Subject: use quickpdf with pdf files version 1,5 and 1,6
Date Posted: 06 Aug 07 at 1:37PM
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I need help to be able to use quickpdf with pdf files version 1,5 and 1,6.
i have iSEDQuickPDF dll version
javier
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Replies:
Posted By: Ingo
Date Posted: 06 Aug 07 at 5:01PM
Hi Javier!
If the new pdf-documents doesn't use aes-encryption there's no problem. If they're using aes you can use only few quickpdf-functions.
A workaround:
You can use GetInformation(0) for the pdf-version.
If it's 1.5 or 1.6 you can use Encrypted. If this function returns 2 you can say that's aes.
Chicks had created an addon to encrypt and decrypt with aes, too:
http://www.quickpdf.org/forum/forum_posts.asp?TID=656
Best regards,
Ingo
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Posted By: javiermgjs
Date Posted: 07 Aug 07 at 3:29PM
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Hello ingo
Thank you very much for the fast answer.
The pdf that I have to use are version 1.6 and they are not encoded, only they have restrictions to not allow modifications of the contents.
In any case i use the two instructions that you suggest and results were the hoped-for.
GetInformation ( 0 ) = 1.6
Encrypted = 0
What i can do in order to solve this problem.
Grateful Javier
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Posted By: Ingo
Date Posted: 08 Aug 07 at 8:34AM
Hi!
It depends on what you want to do with the document. Normally there's no problem using QuickPDF for these files (1.5/1.6) if there's no aes-encryption.
You can remove the restrection for modification with "permissions" and "encrypt".
Best regards,
Ingo
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Posted By: javiermgjs
Date Posted: 08 Aug 07 at 8:48AM
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Hello ingo
i'm very pleased for finding a forum like this, because i'm recently buy a license for quickpdf but, without knowing there is no suport from the original manufacturer.
thanks for your help.
i'm just wanna modify some field values for later call to adobe reader and that the reader show this fields with previously selected values.
i'm tryin right now your sugestion. if you can detail it, it would be more quickly my task
thanks again, Javier
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Posted By: javiermgjs
Date Posted: 08 Aug 07 at 9:11AM
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Hi Ingo
it does'nt work.
P=Permissions(1,1,1,1,1,1,1,1)
EncryptFile(lFileName, newFileName, '','',0, P)
the open created file in adobe and check restrictions
when i open pdf ib adobe reader restrictions are idems.
i must decrypt it before modifying field values?
Javier
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Posted By: Ingo
Date Posted: 08 Aug 07 at 9:32AM
"...
i must decrypt it before modifying field values?
..."
Hi!
Yes. You must encrypt first.
A short example:
. . .
If QP.Encrypted then QP.Unencrypt;
. . .
All this you can read in the documentation:
http://www.quickpdf.org/forum/forum_posts.asp?TID=664
Best regards,
Ingo
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Posted By: javiermgjs
Date Posted: 08 Aug 07 at 10:05AM
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Nothing, it does'nt work
i try every variant that i imagine.
i found a program that remove restriction for the pdf, then de values changes, but when acrobat show the pdf values previously sets in my program they does'nt show until i edit the field, and when i modify value is when it shows permanentely.
what e mistery.
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Posted By: javiermgjs
Date Posted: 10 Aug 07 at 3:00PM
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Hi to all
last problem about fields that does'nt show was solved using SetNeedAppearances(1) before saving pdf and call adobe reader.
the program i use to remove restrictions to pdf's was a-pdf.
a-pdf can be downloaded in trial mode for 15 days at http://www.a-pdf.com - http://www.a-pdf.com it's cheap only $9.99 if you want to buy it.
the only problem with a-pdf is that it reduces pdf version to 1.4.
i still want to work with pdf's version 1.5 and 1.6, if anybody can remove restrictions whithout reducing pdf version please helpme.
thanks
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Posted By: Ingo
Date Posted: 10 Aug 07 at 3:04PM
Hi again ;-)
Why not using the tool from Chicks?
br
Ingo
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Posted By: javiermgjs
Date Posted: 10 Aug 07 at 3:18PM
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hi Ingo
i already use the tools from chicks but i can't remove retrictions like with a-pdf.
if you can suggest correct series of commands to do that ill try again.
Javier
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Posted By: Ingo
Date Posted: 10 Aug 07 at 3:44PM
Hi!
If you call only "pdfcrypt" from the cmd-line you'll get help...
From the cmd-line:
pdfcrypt infile outfile decrypt ""
...and then <enter>
If you don't have success you can mail the pdf.
br
Ingo
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Posted By: Ingo
Date Posted: 11 Aug 07 at 9:08AM
Hi Javier!
Sorry but there are no restrictions on the file.
Adobe tells me that there are restrictions for working with signatures
but that's normal.
Document assembly (yes/no) can only be set with 128 bit encryption but
on your file is no encryption/restriction - there's nothing to remove.
Best regards,
Ingo
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Posted By: chicks
Date Posted: 11 Aug 07 at 11:19AM
Ingo,
You'll probably be interested to know that the PoDoFo PDF lib is adding AES encryption support. See Revision 607 in the SVN repository:
http://podofo.svn.sourceforge.net/viewvc/podofo/podofo/?view=log
I've been following PoDoFo for a while now, it keeps getting better. It (usually) compiles nicely in Windows under MinGW/MSYS.
I'll compile the new podofoencrypt tool once they get AES working, and make it available.
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Posted By: Ingo
Date Posted: 11 Aug 07 at 4:13PM
Hi Chicks!
Yes, you're right ... i'm interested ;-)
Thanks a lot. You don't forget us (and me ;-)
Great!
br
Ingo
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Posted By: chicks
Date Posted: 14 Aug 07 at 11:28AM
OK, PoDoFo's author has completed the commandline podofoencrypt, and I compiled it under MinGW/MSYS, and uploaded it to my site:
http://www.esnips.com/web/PDFTools
Look for it on the last page. Podofoencrypt doesn't yet support AES, but the author is making considerable progress, so I expect it soon.
Note that the PoDoFo lib can be compiled either static or dynamic, so a DLL encryption lib should be fairly easy
to create with it. I'll see what I can do once the AES is working.
Y'all should consider installing MinGW/MSYS if you want to use this open source, supported PDF lib. You should be able to compile it using the much easier Dev C++ (which was written in Delphi AFAIK).
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Posted By: Ingo
Date Posted: 14 Aug 07 at 11:55AM
Is it easy installing MinGW/MSYS?
Can you explain the structure of a MinGW/MSYS-Installation with C++?
...Or is there a good online-tutorial?
Thanks and best regards,
Ingo
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Posted By: chicks
Date Posted: 14 Aug 07 at 4:37PM
It's actually fairly painful to install and figure out. You'll always run into dependencies that you don't have installed, so you'll need to download, compile and install them to continue. After successfully installing it, you'll most likely need libiconv, libfontconfig, libfreetype, libjpeg, libz, and possibly quite a few others.
A working knowledge of a linux shell, such as bash, will be extremely useful, since MinGW is essentially a unix emulator for Windows.
The good news is that libs for just about anything you want to do are available, and a good percentage of them will compile under MinGW, making them available under Windows.
I see that they have a new installer, which might make it a bit less painful - I haven't tried it.
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Posted By: Ingo
Date Posted: 23 Aug 07 at 10:15AM
Hi Chicks!
I've tried podofoencrypt now.
rc4v1 means 40 bit, rc4v2 means 128 bit. If i take rc4v2 the pdf-version was automatically set to 1.5 - 1.4 should be enough... Is it PoDoFo or is it your code? If AES and decryption is included it could be better than PDFcrypt.
Thanks!
Best regards,
Ingo
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Posted By: chicks
Date Posted: 23 Aug 07 at 5:11PM
Not my code, so we'll both have to wait for Dominik to get the AES code working. He borrowed the encryption code from another PDF project, so it's probably just a learning curve issue.
I agree that this will be better than PDFCrypt once its working :)
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