On 10/08/2011 0:29, vfeki wrote:
Need to retrieve all existing paragraphs or chapters/sections from it, so
I'll be able to create bookmarks upon that list I retrieve from existing
pdf.
This is easy if the PDF contains an outline tree. But as you've tried this:
Tried to get Outlines, like ... PdfDictionary root = reader.getCatalog();
PdfDictionary outlines =
root.getAsDict(PdfName.OUTLINES); ...
but get null as a result.
it seems as if the PDF doesn't have an outline tree.
By the way, there's an easier way to extract bookmarks:
PdfReader
<http://api.itextpdf.com/itext/com/itextpdf/text/pdf/PdfReader.html> reader =new
PdfReader <http://api.itextpdf.com/itext/com/itextpdf/text/pdf/PdfReader.html>(src);
List<HashMap<String, Object>> list =SimpleBookmark
<http://api.itextpdf.com/itext/com/itextpdf/text/pdf/SimpleBookmark.html>.getBookmark(reader);
SimpleBookmark
<http://api.itextpdf.com/itext/com/itextpdf/text/pdf/SimpleBookmark.html>.exportToXML(list,
new FileOutputStream(dest),"ISO8859-1",true);
However, this won't work if root.getAsDict(PdfName.OUTLINES) returns null.
Because that means that there are no bookmarks in the PDF.
Now there are two options:
[1] The PDF is tagged: you can check this by consulting File> Document
Properties.
In this case, you can convert the PDF to an XML file and parse the XML file for
its structure.
[2] The PDF is NOT tagged: in this case, your requirement is a mission
impossible!
You must understand that (unless the PDF is "tagged") all structure gets
lost when a PDF is created.
What used to be a title, a paragraph, a caption, is just a string of
glyphs drawn on a canvas.
What used to be a table is a bunch of paths and glyphs drawn on a page.
You can extract the lines of text using iText, but no tool can tell you
if that line is part of a paragraph (and if so: which paragraph?) or if
it's a title.
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