We are having a problem with PdfCopy (and PdfSmartCopy) generating PDFs that
give the following error in Acrobat when navigating to any page except the
first page:
Could not find XObject named 'Xi1'
The stamped content appears on the first page of the PDF only. Subsequent
pages show the original content, but not the stamp content.
We have traced the trigger to whether we re-instantiate the PdfReader used for
the content source of the stamp for every single output page. If we re-use the
PdfReader from page to page, we get the above error. If we create a new
PdfReader for every page, we do not get the above error.
Here is test code that will recreate the problem (if you change
resetStampEachPage to true, the PDF generated behaves properly):
public void mergeAndStampPdf(File[] in, File out, File stamp) throws
Exception {
Document document = new Document();
PdfCopy writer = new PdfSmartCopy(document, new FileOutputStream(out));
document.open();
boolean resetStampEachPage = false;
int stampPageNum = 1;
PdfReader stampReader = new PdfReader(stamp.getPath());
for (int inNum = 0; inNum < in.length; inNum++){
// create a reader for the input document
PdfReader documentReader = new PdfReader(in[inNum].getPath());
for (int pageNum = 1; pageNum <= documentReader.getNumberOfPages();
pageNum++){
// import a page from the main file
PdfImportedPage mainPage =
writer.getImportedPage(documentReader, pageNum);
// make a stamp from the page and get under content...
PdfCopy.PageStamp pageStamp = writer.createPageStamp(mainPage);
// import a page from a file with the stamp...
if (resetStampEachPage)
stampReader = new PdfReader(stamp.getPath());
PdfImportedPage stampPage = writer.getImportedPage(stampReader,
stampPageNum++);
// add the stamp template, update stamp, and add the page
pageStamp.getOverContent().addTemplate(stampPage, 0, 0);
pageStamp.alterContents();
writer.addPage(mainPage);
if (stampPageNum > stampReader.getNumberOfPages())
stampPageNum = 1;
}
}
writer.close();
document.close();
}
It seems odd to me that it wouldn't be legal to call getImportedPage on the
same reader more than once (after all, we are calling getImportedPage on the
source file reader multiple times without issue).
I noticed in the source for PdfCopy#createPageStamp() that it says that it
modifies the Reader instance, but I'm assuming this refers to the reader
associated with the page passed in to createPageStamp.
Any ideas on what's going on here (or are we mis-using something)?
Thanks!
- K
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