Okay, I think I found it. Of course using PRStream
wouldn't be any better than PdfStream because PRStream
extends PdfStream and doesn't override toPdf().
PdfStream.toPdf() is implemented as always returning
null. I didn't know why that should be, so I changed
it. It was:
public byte[] toPdf(PdfWriter writer) {
dicBytes = super.toPdf(writer);
return null;
}
but I changed it to:
public byte[] toPdf(PdfWriter writer) {
dicBytes = super.toPdf(writer);
return dicBytes;
}
and it seems to work now.
-Matt
--- Matt Benson <[EMAIL PROTECTED]> wrote:
> 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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> > > http://thinkgeek.com/sf
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> >
>
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> >
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