One obvious problem is that this example was using
PdfStream, which always returns null from toPdf.
However, I had already been using PRStream before that
with the same results. I am going back to PRStream in
the debugging to which I have been forced to turn, due
to the terrible problem of time zones! :)
--- Matt Benson <[EMAIL PROTECTED]> wrote:
> 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)
> >
> >
> >
> >
>
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