Hello,
Thank you for your reply. They are really filtered, since the
RemoveUnusedObjects method is called when a PDF document is loaded. Thus I've
got to hack the source code and modify the ReadPdf method in the PdfReader
class and comment out the calling statement.
>________________________________
>From: Mark Storer <[email protected]>
>Subject: RE: [iText-questions] What are those unused objects in a PDFdocument
>
>
>Filtered? No. Inaccessible from the root following
various indirect references? Yep. That's why their
unused.
>
>If you really don't want to touch the source, you should be
able to step through all the objects before and after RemoveUnusedObjects, and
dump the ones that were removed after the fact.
>
>Here's some pseudocode.
>
>Map<int, str> allObjects
>For each indirect object in the reader
> allObjects.put(obj number, string
representation);
>
>RemoveUnusedObjects();
>
>for each indirect object in the reader
> allObjects.remove(obj number);
>
>for each entry in allObjects
> System.out.println(entry.value);
>
>
>For PdfArrays and PdfDictionaries, you should be able to use
the toString() of the underlying ArrayList or HashMap. For PdfStreams, you
probably just want to note that its a stream unless you really want to show all
the binary data of some image/font/content stream. The last might be
interesting, but the binary gobbledegook of images and fonts probably won't
tell
you much.
>
>--Mark Storer
> Senior Software
Engineer
> Cardiff.com
>
>import legalese.Disclaimer;
>Disclaimer<Cardiff>
DisCard = null;
>
>Autonomy Corp., an HP
Company
>
>
>
>>________________________________
>> From: WMJ [mailto:[email protected]]
>>Sent: Thursday, October 06, 2011 4:32 PM
>>To: Post all your questions about iText here
>>Subject: Re: [iText-questions] What are those unused objects in a PDFdocument
>>
>>
>>It seems that those unused objects are already filtered when the document is
>>loaded and the only way to inspect them is to hack the source code.
>>
>>
>>
>>>________________________________
>>> Subject: RE: [iText-questions] What are those unused objects in a PDF
>>> document
>>>
>>>
>>>You could hack the source to dump a string representation of those objects
>>>to System.out prior to removing them. Shouldn't be too hard.
>>>
>>>--Mark Storer
>>> Senior Software Engineer
>>> Cardiff.com
>>>
>>>import legalese.Disclaimer;
>>>Disclaimer<Cardiff> DisCard = null;
>>>
>>>Autonomy Corp., an HP Company
>>>
>>>
>>>
>>>>________________________________
>>>> From: WMJ [mailto:[email protected]]
>>>>Sent: Thursday, October 06, 2011 2:17 AM
>>>>To: [email protected]
>>>>Subject: [iText-questions] What are those unused objects in a PDF document
>>>>
>>>>
>>>>Hello,
>>>>
>>>>
>>>>I find that there's a RemoveUnusedObjects method in the PdfReader class.
>>>>It seems that there can be some objects which are not referenced by other
>>>>objects and hence are "unused".
>>>>Some PDF files, after processed by the RemoveUnusedObjects, can
>>>>dramatically reduce to 30% the size of the original one.
>>>>I wondered what's inside those unused objects.
>>>>Is it possible to find out what things are in those removed objects?
>>>>
>>>>
>>>>WMJ
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>
>
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