And now you have a stream as a direct object, which is illegal.
Best Regards,
Paulo Soares
----- Original Message -----
From: "Matt Benson" <[EMAIL PROTECTED]>
To: "Paulo Soares" <[EMAIL PROTECTED]>; "itext-questions"
<[EMAIL PROTECTED]>
Sent: Wednesday, March 12, 2003 23:11
Subject: RE: [iText-questions] modifying metadata
> 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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