Read/Modify PDF Metadata using iTextSharp

Question

I am trying to use iTextSharp to read/modify PDF metadata. I figured out how to do it using pdfreader and pdfstamper. I was wondering if I could also read/modify additional metadata information like copyright information and few others within the XMP photoshop namespace.

I would greatly appreciate any pointers to the solution.

Thank you, Murugesh.

Dilapidate

Answer 1

You can read metadata using `PdfReader'. I've read metadata like this:

PdfReader reader = new PdfReader("HelloWorldNoMetadata.pdf");
string s = reader.Info["Author"];

You can try the iTextSharp.text.xml.xmp.XmpWriter class to write metadata. I've never done it but I found this code below:

PdfReader reader = new PdfReader("HelloWorldNoMetadata.pdf");
PdfStamper stamper = new PdfStamper(reader,
 new FileOutputStream("HelloWorldStampedMetadata.pdf"));
HashMap info = reader.getInfo();
info.put("Author", "Bruno Lowagie");
info.put("Title", "Hello World stamped");
stamper.setMoreInfo(info);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
XmpWriter xmp = new XmpWriter(baos, info);
xmp.close();
stamper.setXmpMetadata(baos.toByteArray());
stamper.close();

Betancourt

Thanks for the response. It works. I am able to put values to any schema within XMP now. But whenever I insert a value other than the common metadata fields (Author, Title, Subject, Keywords) it adds them as a custom field which goes under "pdfx" schema in addition to the schema where I am inserting it. I don't want them to be added as custom fields. Any pointers? Thanks, Murugesh. – Dilapidate

@Dilapidate - No sorry I don't have any pointers; I've never tried what you're doing. I also couldn't find much on the iTextSharp.text.xml.xmp namespace. – Betancourt

Hi, Has anyone got a basic C# example of adding MetaData? I cant seem yto convert this to C#.Thanks. – Mekong

Answer 2

Try the examples in the iTextSharp book there are examples on modifying any part of the pdf file!

Thromboplastic

Thanks for sharing that. I am already done with this application. But hopefully this will help someone who is looking for an answer to this question. – Dilapidate

Link dead. To be expected after 11 years. That's why there are rules about link only answers – Avelinaaveline

Thanks for the update @Gerhard, appreciate your effort. – Avelinaaveline