PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Thu Sep 29, 2016 12:50 am 
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Joined: Mon Jul 04, 2016 4:00 am
Posts: 2
Hi,

I have a file upload form that users use to upload pdfs.
Pdf sharp date stamps the pdfs that are uploaded.
It seems to work for most pdfs but it seems that a few users receive an error.
In the logs I get the following:

System.NullReferenceException: Object reference not set to an instance of an object. at PdfSharp.Pdf.PdfPages.GetKids(PdfReference iref, InheritedValues values, PdfDictionary parent...

I am using PDFsharp-1_50-beta3b.
Any suggestions on what may be causing this error?

Kind regards,
Chris


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PostPosted: Thu Sep 29, 2016 8:11 am 
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empira Employee
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 2829
Location: Cologne, Germany
Hi!
chrisc wrote:
Any suggestions on what may be causing this error?
Sounds like a known issue that was not resolved yet.
I don't know whether or not the files are valid, but we shall try to support them with PDFsharp.

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Thomas Hoevel
PDFsharp Team


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PostPosted: Thu Dec 08, 2016 11:15 am 
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Joined: Thu Dec 08, 2016 11:10 am
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Hi, i have the same issue with some pdf files,
Could i email you a pdf to check what is the problem.

Thanks in advance.


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PostPosted: Thu Dec 08, 2016 1:52 pm 
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empira Employee
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Joined: Mon Oct 16, 2006 8:16 am
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Location: Cologne, Germany
Hi!
I sent you a PM with our e-mail address for file submissions.

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Thomas Hoevel
PDFsharp Team


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PostPosted: Mon Mar 12, 2018 1:49 pm 
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Joined: Thu Nov 09, 2017 2:03 pm
Posts: 2
Is there any news on this issue? I'm experiencing the same exception, but since the files are confidential, I can't share them, unfortunately.

Thanks in advance.

My stack trace is:
Code:
at PdfSharp.Pdf.PdfPages.GetKids(PdfReference iref, InheritedValues values, PdfDictionary parent)
at PdfSharp.Pdf.PdfPages.FlattenPageTree()
at PdfSharp.Pdf.Advanced.PdfCatalog.get_Pages()
at PdfSharp.Pdf.PdfDocument.get_Pages()
...


I've tried PDFsharp.1.50.4000-beta3b and PDFsharp-MigraDoc.1.50.4790-beta5a with same result.

EDIT: I have attached some output from veraPDF (it's probably not supposed to be a PDF/A file, but it still might give you some hints). Sorry for hijacking the thread if it's a different issue.


Attachments:
htmlReport.zip [11.76 KiB]
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PostPosted: Tue Mar 13, 2018 9:42 am 
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empira Employee
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 2829
Location: Cologne, Germany
PDFsharp 1.50 was not optimized for the handling of corrupt PDF files.

There are some pull requests on GitHub that improve dealing with corrupt PDF files. Maybe one of them helps with the Kid problem.
The pull requests will be included in future versions of PDFsharp.

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Thomas Hoevel
PDFsharp Team


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