Okay, I am STUCK. I can play with XMP/RDF, that's
fine, and I've been doing it. But I am finding myself
unable to actually change the metadata of a given PDF.
I have culled together a fairly short example; can
anyone see any obvious problems?
import java.io.FileOutputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import com.lowagie.text.pdf.PdfName;
import com.lowagie.text.pdf.PRStream;
import com.lowagie.text.pdf.PdfObject;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStream;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfDictionary;
public class MinimalModifyPdfMetadata
{
public byte[] modifyMetadata(String pdf)
throws Exception
{
ByteArrayOutputStream baos = new
ByteArrayOutputStream();
PdfReader pdfReader = new PdfReader(pdf);
byte[] b =
PdfReader.getStreamBytes((PRStream)(PdfReader.getPdfObject(
pdfReader.getCatalog().get(new
PdfName("Metadata")))), pdfReader.getSafeFile());
System.out.println("original metadata");
System.out.println(new String(b));
PdfStamper stamp = new PdfStamper(pdfReader,
baos);
//set the metadata
pdfReader.getCatalog().put(new
PdfName("Metadata"), new PdfStream(b));
try
{
stamp.close();
}//end try
catch (Exception ex)
{
ex.printStackTrace(System.err);
}//end catch Exception
return baos.toByteArray();
}//end modifyMetadata
public static void main(String[] args)
throws Exception
{
int code = 0;
if (args.length > 1)
{
BufferedOutputStream bos
= new BufferedOutputStream(new
FileOutputStream(args[1]));
bos.write(new
MinimalModifyPdfMetadata().modifyMetadata(args[0]));
bos.close();
}//end if at least 2 args
else
{
System.err.println(
"Usage: MinimalModifyPdfMetadata input-file
output-file");
}//end else, wrong # of args
System.exit(code);
}//end main
}//end class MinimalModifyPdfMetadata
I get the following stack trace when I run the above
code:
java.lang.NullPointerException
at
java.io.OutputStream.write(OutputStream.java:65)
at
com.lowagie.text.pdf.PdfDictionary.toPdf(PdfDictionary.java:152)
at
com.lowagie.text.pdf.PdfIndirectObject.<init>(PdfIndirectObject.java:
138)
at
com.lowagie.text.pdf.PdfIndirectObject.<init>(PdfIndirectObject.java:
107)
at
com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:255)
at
com.lowagie.text.pdf.PdfWriter.addToBody(PdfWriter.java:1361)
at
com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java:107)
at
com.lowagie.text.pdf.PdfStamper.close(PdfStamper.java:104)
at
MinimalModifyPdfMetadata.modifyMetadata(MinimalModifyPdfMetadata.java
:36)
at
MinimalModifyPdfMetadata.main(MinimalModifyPdfMetadata.java:57)
--- Leonard Rosenthol <[EMAIL PROTECTED]> wrote:
> At 03:00 PM 3/10/2003 -0800, Matt Benson wrote:
> >Is XMP the only valid format for the Metadata
> stream?
>
> Yes.
>
>
> >What means would you suggest for reading this?
>
> The Adobe XMP Toolkit is the best, but that
> assumes Mac OS or
> Windows. Since it's XML you can really use any XML
> parser you want -
> though starting with an RDF parser (on top of your
> XML) will help...
>
>
> Leonard
>
---------------------------------------------------------------------------
> Leonard Rosenthol
> <mailto:[EMAIL PROTECTED]>
> Chief Technical Officer
> <http://www.pdfsages.com>
> PDF Sages, Inc.
> 215-629-3700 (voice)
>
>
>
>
-------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf
> _______________________________________________
> iText-questions mailing list
> [EMAIL PROTECTED]
>
https://lists.sourceforge.net/lists/listinfo/itext-questions
__________________________________________________
Do you Yahoo!?
Yahoo! Web Hosting - establish your business online
http://webhosting.yahoo.com
-------------------------------------------------------
This SF.net email is sponsored by:Crypto Challenge is now open!
Get cracking and register here for some mind boggling fun and
the chance of winning an Apple iPod:
http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en
_______________________________________________
iText-questions mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/itext-questions
