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SecurityInfo

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=3285
Printed Date: 18 Jan 26 at 5:42PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: SecurityInfo

Posted By: mdgodfrey
Subject: SecurityInfo
Date Posted: 19 Mar 16 at 12:30AM

I am trying to discover if a PDF has a password or not before attempting to decrypt it.

I have tried using SecurityInfo(1) and SecurityInfo(2) which checks for Master and User respectively. At least according to the documentation I have.

They both just seem to just want to return 2 which is 'No'.

I know the file has a password because I can decrypt it using the password.

So I am not sure what I am missing. Any help, please?

Replies:

Posted By: tfrost
Date Posted: 19 Mar 16 at 9:17AM

How did you open in QPDF it if it had a password? You can simply call DAOpenFileReadOnly with an empty password. If the file has a password you should get a zero result and the last error code should be 404. But it depends what type of functionality the password you are checking for would be protecting.

Posted By: Ingo
Date Posted: 19 Mar 16 at 3:31PM

Up to the 7.xx-versions of QuickPDF you could use SecurityInfo after LoadFromFile to check for user- and masterpassword.

Debenu decided then to be completely legal to the pdf-specs.

This means that a user-password should prevent for looking into a pdf-document.

So the LoadFromFile won't work proper if the pdf-document has a user-password.

The main-password isn't a problem - SecurityInfo will check this in a proper way.

If you want to load a pdf-document with a user-password, after LoadFromFile it's always necessary now to use LastErrorCode.

The last error code 404 shows you that there's a user password.

I've comunicated about this issue with Debenu in the past.

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Cheers,
Ingo

Posted By: mdgodfrey
Date Posted: 20 Mar 16 at 12:11AM

That's the answer I needed.

Thanks much