Hello,
I'm investigating using this library to strip images out of PDFs and
replace with different images that also link to a webpage (explaining
why the images have been replaced).
I have successfully compiled some sample code used to strip images
from a PDF. However, when I open the PDF in Acrobat Pro, I get the
following two errors:
1) When the first page that had an image replaced is scrolled into
view: "Could not find XObject named 'Im0'";
2) When the next page that had an image replaced is scrolled into
view: "An error exists on this page. Acrobat may not display the page
correctly. Please contact the person who created the PDF document to
correct the problem."
The version of Acrobat I am using is:
Adobe Acrobat 8 Professional (8.1.2)
My code is:
import java.io.*;
import java.util.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;
public class itexttest{
public static void main(String[] args){
try{
PdfReader pdf = new PdfReader(args[0]);
PdfStamper stp = new PdfStamper(pdf, new
FileOutputStream(args[1]));
PdfWriter writer = stp.getWriter();
Image img = Image.getInstance("image.png");
for(int i = 1, l = pdf.getNumberOfPages(); i <= l; i++){
PdfDictionary pg = pdf.getPageN(i);
if(pg == null){
System.out.println("PDFD null");
continue;
}
PdfDictionary res =
(PdfDictionary)PdfReader.getPdfObject(pg.get(PdfName.RESOURCES));
PdfDictionary xobj =
(PdfDictionary)PdfReader.getPdfObject(res.get(PdfName.XOBJECT));
if (xobj != null) {
for (Iterator it =
xobj.getKeys().iterator(); it.hasNext(); ) {
PdfObject obj =
xobj.get((PdfName)it.next());
if (obj.isIndirect()) {
PdfDictionary tg =
(PdfDictionary)PdfReader.getPdfObject(obj);
PdfName type =
(PdfName)PdfReader.getPdfObject(tg.get(PdfName.SUBTYPE));
if(PdfName.IMAGE.equals(type)) {
PdfReader.killIndirect(obj);
Image maskImage
= img.getImageMask();
if (maskImage
!= null)
writer.addDirectImageSimple(maskImage);
writer.addDirectImageSimple(img,
(PRIndirectReference)obj);
//break;
}
}
}
}
}
stp.close();
}catch(Exception e){
System.out.println("Error: " + e.toString());
}
}
}
If it helps, the lines:
if (maskImage != null)
writer.addDirectImageSimple(maskImage);
are useless, because for some reason maskImage is always null.
Can anyone help me with my task here?
Thanks!
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