At 01:19 PM 8/4/2006, Zhi Ren wrote:
>Maybe this is a stupid question. we know we cannot
>modify the content of an existing PDF file,

     You can - but not with iText.


>My question
>is: if I use iText to add an image or an paragraph
>into an existing PDF file, can I delete the image or
>the paragraph later with iText?

     Again, not with iText.

     iText doesn't support READ access to content ONLY WRITE.


>My thought is: because
>the image was added into a PDF file by myself, I know
>exactly where I put there and all the other infomation
>about the image,

     You do??

     You know what PDF object ID it is? You know where it is in
the content stream?


>so is those enough to enable me to delete the image later with iText?

     Yes, if you want to do some work...


Leonard

---------------------------------------------------------------------------
Leonard Rosenthol                   <mailto:leonardr@(protected)>
Chief Technical Officer               <http://www.pdfsages.com>
PDF Sages, Inc.                    215-938-7080 (voice)
                              215-938-0880 (fax)


-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys -- and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
iText-questions mailing list
iText-questions@(protected)
https://lists.sourceforge.net/lists/listinfo/itext-questions