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Invalidpdfexception pdf header signature not found

Tags:

itextsharp

I have some code that reads pdf files. The code fails at the line :

iTextSharp.text.pdf.PRTokeniser.CheckPdfHeader() at
                                 iTextSharp.text.pdf.PdfReader.ReadPdf()

I know from other entries that this issue is coming from some invalid formatting in the pdf. However I'm not in a position to tell my users to redo their pdfs. Is there some other way around this issue, that can allow reading of the pdf despite this problem?

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David Choi Avatar asked Sep 10 '12 18:09

David Choi


1 Answers

If a file doesn't start with %PDF- then there's nothing to fix: the file isn't a PDF file.

However, there may be another problem: maybe you're trying to access a file that has zero length due to some problem while creating the InputStream. Another context in which I've seen this happen, is a PDF loaded from a server, where the server returned a 404 message in HTML instead of a PDF file ;-)

Whenever that exception happens, you should store the bytes somewhere, and examine them. Without those bytes, nobody will be able to give you useful advice.

like image 71
Bruno Lowagie Avatar answered Nov 09 '22 14:11

Bruno Lowagie