Debenu Quick PDF Library - PDF SDK Community Forum : Problems with DecryptFile Function http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 16 Jul 2026 12:38:09 +0000 Sun, 20 Dec 2009 14:52:19 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=1296 <![CDATA[Debenu Quick PDF Library - PDF SDK Community Forum]]> http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ <![CDATA[Problems with DecryptFile Function : Hi Ingo (and Michel): Thank...]]> http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5950.html#5950 Author: Shotgun Tom
Subject: 1296
Posted: 20 Dec 09 at 2:52PM

Hi Ingo (and Michel):
 
Thank you for the reply, Ingo.  Just to let you guy's know... I finally went to bed and slept for a few hours.  Woke up and found out what I was doing wrong.  It had to do with having the document open in a viewer in the same program I was working on.  Sometimes sleep helps your brain Wacko
 
A very Merry Christmas and Happy New Year to you as well.  Enjoy the holidays!
 
Tom
]]> Sun, 20 Dec 2009 14:52:19 +0000 http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5950.html#5950 <![CDATA[Problems with DecryptFile Function : Hi Tom!We&#039;re talking about...]]> http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5949.html#5949 Author: Ingo
Subject: 1296
Posted: 20 Dec 09 at 12:03PM

Hi Tom!

We're talking about main and user passwords.
The user password is the one you have to insert while opening the pdf in a reader.
The main password the user won't see ... it's only to make the pdf-settings a little bit saver.
It's not possible to set only a user password. If the creator of a pdf determines a user- and not a main password the user password will be the main password, too.
There's no problem to analyze the structure of a pdf if there are user- and/or main-passwords.
If you want to decrypt AND SAVE a pdf which has a main- and a user-password it's okay to insert only the main-password.
If there's a user-password you can't do things like previews and textextractions without the user password... and i think that's good ;-)
This behavior doesn't belong only to the QuickPDF-sdk... that's normal for all libraries.

Cheers, Ingo

BTW: To all readers and writers here...
Merry Christmas and a Happy New Year 2010!


]]> Sun, 20 Dec 2009 12:03:39 +0000 http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5949.html#5949 <![CDATA[Problems with DecryptFile Function : Hi Michel: Thank you for your...]]> http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5948.html#5948 Author: Shotgun Tom
Subject: 1296
Posted: 20 Dec 09 at 2:03AM

Hi Michel:
 
Thank you for your reply.  I will try this code.
 
However, many, many files are encrypted only with a User Password.  In other words, there are no permission's encryption, just a password for the User.  If I can't use the User password, how can I decrypt those successfully?
 
Tom
 
 BTW, I'm talking about permanently decrypting... that is... re-saving the file with no passwords, no security.


Edited by Shotgun Tom - 20 Dec 09 at 2:05AM]]> Sun, 20 Dec 2009 02:03:19 +0000 http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5948.html#5948 <![CDATA[Problems with DecryptFile Function : Actually, I have been using...]]> http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5947.html#5947 Author: Michel_K17
Subject: 1296
Posted: 19 Dec 09 at 11:16PM

Actually, I have been using this function (successfully) for the last 4 years. Here is my VB code.

Note: make sure you use the "Owner"  password. It will definitely not work with the "User" password.

I hope it helps.

'---------------------------------------------------------------------------------------
' Procedure : PDF_Decrypt_File
' DateTime  : 11/26/2005 10:41
' Author    : Michel_K17
' Purpose   : This function will take an encrypted/locked PDF, and save it unencrypted.
'---------------------------------------------------------------------------------------
'
Private Function PDF_Decrypt_File(MyFile As String, pwd As String) As Boolean
   
    ' Trap Errors
    On Error GoTo Error_Handler
      
    ' Remove the Extension
    If Right$(MyFile, 4) = PDF Then MyFile = Left$(MyFile, Len(MyFile) - 4)
   
    ' Rename the file to process to an intermediate file
    Name MyFile & PDF As MyFile & "_D4W" & PDF
   
    ' Decrypt it
    rtn = oPDF.DecryptFile(MyFile & "_D4W" & PDF, MyFile & PDF, Decrypt(pwd, fUnicodeUser))
    If rtn = 1 Then PDF_Decrypt_File = True
   
    ' Delete the intermediate file
    Kill MyFile & "_D4W" & PDF

    Exit Function
   
Error_Handler:
    ' An unexpected error occured. Log it. (MUST have this line first, or the Err object gets reset).
    olog.LogError False, Err.Number, Err.Description, Err.LastDllError, "PDF_Decrypt_File"
   
End Function
]]> Sat, 19 Dec 2009 23:16:23 +0000 http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5947.html#5947 <![CDATA[Problems with DecryptFile Function : I have spent the last two days...]]> http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5946.html#5946 Author: Shotgun Tom
Subject: 1296
Posted: 19 Dec 09 at 8:13PM

I have spent the last two days trying to implement a decrypt file routine using, primarily, the QuickPDF DecryptFile function. 
 
The function looks like it works in that it returns a success code and actually writes the file... but there is no PDF reader on the planet that will open the file.  I thought for sure it must something I was doing.  I tried securing several different files... some with just a user password some with user and owner passwords... different levels of encryption.  I set the security in Adobe Pro 9.2.
 
Then I tried using Debenu's QuickPDF Tools.  Lo and behold, the same thing.  It writes the file but I can't open it in any PDF Reader... not Adobe, Acrobat, Fox-It, PCX View... they all give the same error.  The file is corrupted.  I assume that Debenu is using the DecryptFile routine in 7.17 which is what I've been dealing with.
 
Anyone else run into this problem?  Is this a known issue?
 
Tom
]]> Sat, 19 Dec 2009 20:13:48 +0000 http://www.quickpdf.org/forum/problems-with-decryptfile-function_topic1296_post5946.html#5946