PDFTron leads to Fatal error. System.AccessViolationException: Attempted to read or write protected memory.

Technical Support
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1

Product:
PDFTron.NETCore.Windows.x64

Product Version:
10.10.0

Please give a brief summary of your issue:
PDFTron is throwing a System.AccessViolationException: Attempted to read or write protected memory.

Please describe your issue and provide steps to reproduce it:
We are attempting to use PdfTron to convert documents to Text based PDFs. It seems like conversions are working, however we are seeing the following exception:

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other m
emory is corrupt.
Repeat 2 times:

at pdftron.PDFNetPINVOKE.TRN_FontDestroy(IntPtr)

at pdftron.PDF.Font.Destroy()
at pdftron.PDF.Font.Dispose(Boolean)
at pdftron.PDF.Font.Finalize()

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3

Most likely you are running into a file specific issue.

Can you please provide us the input file, and the code to reproduce.

If the file cannot be posted here in the forum, you can submit at support.apryse.com

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4

Hi Ryan,

Apologies, I must’ve missed your response here. There isn’t one specific file that causes this issue repeatedly; it is a culmination of many.

We’ve taken some PerfView logs of the processes that lead to this exception:

.NET Version: 8.0.11
Description: The process was terminated due to an unhandled exception.
Exception Info: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Stack Trace:

at pdftron.PDFNetPINVOKE.TRN_FontDestroy(IntPtr)
at pdftron.PDFNetPINVOKE.TRN_FontDestroy(IntPtr)
at pdftron.PDF.Font.Finalize()

One of the PDFNet objects implements a finalizer, which is the equivalent of a destructor. When objects with a finalizer need to be cleaned up by the GC, they first go to the special finalization queue to run their finalize methods. It seems like PDFNet is creating a lot of these Font objects that are very expensive to clean up.

In our code, we only reference this object one time:

Dim spaceWdth As Double = New pdftron.PDF.Font(style.GetFont()).GetWidth(32)

So there must be something in the PDFNetC.dll under the covers that we’re missing.

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5

Thank you for the clarifications, though I am unable to reproduce yet.

Are you able to reproduce this using one of our samples?
Such as our TextExtractor sample? If yes, please send me the (modified) sample.

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