problem with loading doc

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   Hi,

i have a problem with loading a document containing form fields:

- I can load it the first time. 

- Then I save it without any changes. 

-> if I want to reload it, it doesn't have any pages 

After some debugging it seems that it cannot find it's root object reference and therefore no pages.

Adobe Reader and GhostView can display it fine. When I uncompress the content with pdftk then I can load and render it with QuickPDf again.

Does someone have an idea what happens here?

thanks,

Ulrich

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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: problem with loading doc Posted: 18 Jul 06 at 8:03AM
	Hi, i have a problem with loading a document containing form fields: - I can load it the first time. - Then I save it without any changes. -> if I want to reload it, it doesn't have any pages After some debugging it seems that it cannot find it's root object reference and therefore no pages. Adobe Reader and GhostView can display it fine. When I uncompress the content with pdftk then I can load and render it with QuickPDf again. Does someone have an idea what happens here? thanks, Ulrich

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: 19 Jul 06 at 3:57AM
	update: as far as I can tell now, it seems to be a problem with cross reference streams. They are ignored on saving the file and so the reference section gets wrongs. Questions: 1) can QuickPDF work with cross reference streams? 2) what is the PDF version, QuickPDF is compatible with? greetings, Ulrich

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: 20 Jul 06 at 4:52AM
	second update: ok, I think I found the problem with the document: the original one contains a cross reference stream and is a hybrid-reference file (so it also contains normal XRef section). Therefore the xref's trailer has an entry /XRefStm pointing to the XRefStream. When the document is saved, the cross reference STREAM is removed and replaced by normal XRef. But the new xrefs trailer still contains the XRefStm tag which now points to nirvana! When I delete the XRefStm manually, I can display the file again. So: is it ok that the xref stream is replaced by normal xref? (if so the bug is that the xRefStm Reference is not deleted, otherwise the bug is in not saving the xref stream). Can someone with more knowledge of PDF spec comment the above? Thanks, Ulrich