PDFsharp & MigraDoc Foundation

I get the following error and i am trying to read a few pdf files to merge them.
This is my read statement: PdfDocument inputDocument = PdfReader.Open(filename1, PdfDocumentOpenMode.ReadOnly);

and it throws this exception at : Debug.Assert(kid.Elements.GetName(Keys.Type) == "/Pages");
PdfPage.InheritValues(kid, ref values);
ArrayList list = new ArrayList();
PdfArray kids = kid.Elements["/Kids"] as PdfArray;
foreach (PdfReference xref2 in kids)

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="PdfSharp"
StackTrace:
at PdfSharp.Pdf.PdfPages.GetKids(PdfReference iref, InheritedValues values, PdfDictionary parent) in C:\Documents and Settings\Wade\My Documents\Work\PDFsharp\PdfSharp\PdfSharp.Pdf\PdfPages.cs:line 359
at PdfSharp.Pdf.PdfPages.FlattenPageTree() in C:\Documents and Settings\Wade\My Documents\Work\PDFsharp\PdfSharp\PdfSharp.Pdf\PdfPages.cs:line 315
at PdfSharp.Pdf.Advanced.PdfCatalog.get_Pages() in C:\Documents and Settings\Wade\My Documents\Work\PDFsharp\PdfSharp\PdfSharp.Pdf.Advanced\PdfCatalog.cs:line 102
at PdfSharp.Pdf.PdfDocument.get_Pages() in C:\Documents and Settings\Wade\My Documents\Work\PDFsharp\PdfSharp\PdfSharp.Pdf\PdfDocument.cs:line 590
at PdfSharp.Pdf.PdfDocument.get_PageCount() in C:\Documents and Settings\Wade\My Documents\Work\PDFsharp\PdfSharp\PdfSharp.Pdf\PdfDocument.cs:line 480
at Pdf_Merge.Form1..ctor() in C:\Documents and Settings\Wade\My Documents\Work\Projects\Pdf Merge\Pdf Merge\Form1.cs:line 67
at Pdf_Merge.Program.Main() in C:\Documents and Settings\Wade\My Documents\Work\Projects\Pdf Merge\Pdf Merge\Program.cs:line 17
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

Please Please help. could it be that there is a problem with my PDF file even though it opens fine in acrobat 8.
Thank you very much.
Wade

Oh and i have also tried to use this code to get my pdf file: PdfDocument inputDocument = PdfReader.Open(filename1, PdfDocumentOpenMode.Import);

This could be the case - we'd need the PDF file to have a closer look.
I presume your PDF file is untypical - maybe a special case PDFsharp is not prepared for, maybe a buggy PDF file.

_________________
Regards
Thomas Hoevel
PDFsharp Team

Can i just send it to your email or how do i go about doing that
Thank you

Hi!

I was able to replicate the problem.
It'll work with this change (File PdfPages.cs, around Line 358):



There are 5 new lines.

The fix will be included with the next release of PDFsharp.

_________________
Regards
Thomas Hoevel
PDFsharp Team

Additionally, the cast to PdfReference needs to be null checked.
I have a pdf that still gets the object ref error from the following:
kids = xref3.Value as PdfArray;

Hi!
Thanks for the feedback.

Checking for null and throwing an exception would be a bit better than not checking for null and getting an exception when using the null object.
Checking for null does not help opening the document.

Would be nice to have that PDF for investigation and testing purposes. Is that possible?

_________________
Regards
Thomas Hoevel
PDFsharp Team