Hello,
I've modified the CopyPdf example in an attempt to copy the content of one
PDF file, and the AcroForm from another, to create a third PDF.
When it attempts to copy the AcroForm, it throws an exception:
java.lang.NullPointerException
at com.lowagie.text.pdf.PdfWriter.getReaderFile(PdfWriter.java:1951)
at com.lowagie.text.pdf.PRStream.toPdf(PRStream.java:194)
at
com.lowagie.text.pdf.PdfIndirectObject.writeTo(PdfIndirectObject.java:167)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:369)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:349)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:341)
at com.lowagie.text.pdf.PdfWriter.addToBody(PdfWriter.java:1860)
at com.lowagie.text.pdf.PdfCopy.copyIndirect(PdfCopy.java:194)
at com.lowagie.text.pdf.PdfCopy.copyObject(PdfCopy.java:260)
at com.lowagie.text.pdf.PdfCopy.copyArray(PdfCopy.java:246)
at com.lowagie.text.pdf.PdfCopy.copyObject(PdfCopy.java:262)
at com.lowagie.text.pdf.PdfCopy.copyDictionary(PdfCopy.java:216)
at com.lowagie.text.pdf.PdfCopy.copyObject(PdfCopy.java:258)
at com.lowagie.text.pdf.PdfCopy.copyIndirect(PdfCopy.java:193)
at com.lowagie.text.pdf.PdfCopy.copyObject(PdfCopy.java:260)
at com.lowagie.text.pdf.PdfCopy.copyDictionary(PdfCopy.java:216)
at com.lowagie.text.pdf.PdfCopy.copyObject(PdfCopy.java:258)
at com.lowagie.text.pdf.PdfCopy.copyIndirect(PdfCopy.java:193)
at com.lowagie.text.pdf.PdfCopy.copyObject(PdfCopy.java:260)
at com.lowagie.text.pdf.PdfCopy.copyArray(PdfCopy.java:246)
at com.lowagie.text.pdf.PdfCopy.copyObject(PdfCopy.java:262)
at com.lowagie.text.pdf.PdfCopy.copyDictionary(PdfCopy.java:216)
at com.lowagie.text.pdf.PdfCopy.copyAcroForm(PdfCopy.java:384)
at AcroFormCopy.main(AcroFormCopy.java:71)
The CopyPdf example works fine on the same input file.
I'm assuming that I'm doing something wrong - does anyone have any insight
into this, or a better way to do it?
Here's the source code:
----------------------------------------------------------------------------
-----------------------------------
import java.io.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;
/**
* Utility to copy PDF Form Fields from one PDF file to another.
* Useful when updating a PDF file by regenerating it from MS Word or
another source that does not preserve the fields.
* Use this utility to copy the fields from the previous version to the new
version.
*/
public class AcroFormCopy
{
/**
* @param args the command line arguments
*/
public static void main(String args[])
{
if (args.length != 3)
{
System.err.println("usage: java AcroFormCopy
fieldspdf nofieldspdf destpdf");
}
else
{
try
{
String formFile = args[0];
String imageFile = args[1];
String outFile = args[2];
Document document = null;
PdfCopy writer = null;
// we create a reader for the "nofields
file"
PdfReader reader = new PdfReader(imageFile);
// we retrieve the total number of pages
int n = reader.getNumberOfPages();
System.out.println("Copying " + n + "
page(s) of content from " + imageFile + " to " + outFile);
// step 1: creation of a document-object
document = new
Document(reader.getPageSizeWithRotation(1));
// step 2: we create a writer that listens
to the document
writer = new PdfCopy(document, new
FileOutputStream(outFile));
// step 3: we open the document
document.open();
// step 4: we add content
PdfImportedPage page;
for (int i = 0; i < n; )
{
++i;
page =
writer.getImportedPage(reader, i);
writer.addPage(page);
System.out.println("Processed page "
+ i);
}
// create a reader for the "form file"
PdfReader formReader = new
PdfReader(formFile);
// copy the form
PRAcroForm form = formReader.getAcroForm();
if(form == null)
{
System.out.println("No fields found
in " + formFile);
}
else
{
System.out.println("Copying fields
from " + formFile + " to " + outFile);
writer.copyAcroForm(formReader);
}
// step 5: we close the document
document.close();
System.out.println("done!");
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
}
----------------------------------------------------------------------------
-----------------------------------
Thanks,
-Rich
--------------------------------------------------
Rich Freedman
Senior Software Engineer
Cross Current Corporation
New Hope, PA, USA
http://www.crosscurrent.com
--------------------------------------------------
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