Am 16.05.2016 um 16:12 schrieb Diego Azevedo:
Hello All,My question is how can I update a page footer in incremental updates: My page structure looks like this: 3 0 obj << /Type /Page /Parent 2 0 R [...] /Contents [6 0 R 7 0 R] >> endobjThe object 7 0 obj contains the footer. But this is a signed pdf, and I want to "update" this footer before another signature, creating another COSStream with the new contents and giving it the same object number (and possibly another revision number -> 7 1 obj, but that's not critical).
From the problems I saw when working on multiple signatures, I'd expect that you'd get a "document was modified" notice in Adobe Reader.
I tried to retrieve this PD/COSStream, create the outputstream, write the new content and "save incremental" but it didn't work.
You'd need to set these objects for update, similar as it is done in the signature code in PDDocument.addSignature(). Call setNeedToBeUpdated(true) on existing objects (e.g. the contents array and the page object)
On a related subject, can I add a footer (without any signature) to all pages with the same object number?
Sure. Tilman
Thanks in advance, Diego Azevedo
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