corrupt XREF sections

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   Hi all,

sometimes I get pdfs from our customers with a corrupt xref section and cannot open it with QuickPDF. I know that it is possible to repair them with pdftk but I need a solution to do this with QuickPDF. 

As I have not found anything in QuickPDF to do such a repair: has someone implemented such a functionality and would be willing to shared the code?

Or how would you implement such a repair functionality?

Thankx,

Uli

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ukobsa Members Profile Find Members Posts Senior Member Joined: 29 May 06 Location: Germany Status: Offline Points: 115	Post Options Post Reply Quote ukobsa Report Post Thanks(0) Quote Reply Topic: corrupt XREF sections Posted: 06 Oct 06 at 5:02AM
	Hi all, sometimes I get pdfs from our customers with a corrupt xref section and cannot open it with QuickPDF. I know that it is possible to repair them with pdftk but I need a solution to do this with QuickPDF. As I have not found anything in QuickPDF to do such a repair: has someone implemented such a functionality and would be willing to shared the code? Or how would you implement such a repair functionality? Thankx, Uli

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3529	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 06 Oct 06 at 5:28AM
	Hi Uli! With QuickPDF you can only test if a pdf is valid or not (CheckObjects). Chicks told in an older postings how to use pdftk in such a case. It's opensource - perhaps you can detect the relevant code-parts in pdftk? Or you can implement pdftk in your solution via shell/shellexecute... Best regards, Ingo

ukobsa Members Profile Find Members Posts Senior Member Joined: 29 May 06 Location: Germany Status: Offline Points: 115	Post Options Post Reply Quote ukobsa Report Post Thanks(0) Quote Reply Posted: 06 Oct 06 at 6:22AM
	Hi Ingo, I just looked for CheckObjects in source code, but this seems to do nothing really useful: it needs the document being already loaded by QuickPDF and then only decodes each object. And it doesn't returns a result of the check. So it doesn't help to check for xref sections. But thanks for giving this hint! greetings, Uli

marian_pascalau Members Profile Find Members Posts Debenu Quick PDF Library Expert Joined: 28 Mar 06 Location: Germany Status: Offline Points: 278	Post Options Post Reply Quote marian_pascalau Report Post Thanks(0) Quote Reply Posted: 26 Oct 06 at 7:16AM
	Hi Ulrich, send please a test sample to me. I will check your error and propose a sollution. Gru�, Marian

ukobsa Members Profile Find Members Posts Senior Member Joined: 29 May 06 Location: Germany Status: Offline Points: 115	Post Options Post Reply Quote ukobsa Report Post Thanks(0) Quote Reply Posted: 26 Oct 06 at 8:24AM
	Marian, the problem with invalid XREFs mostly is caused by a wrong startxref values or invalid object positions on xref entries. What I tried to find is a way to rebuild an xref section from ground up. greetings, Uli