Sorry, for being a little bit vague ... yes, I was talking about digitally signed documents by using cryptographic stuff. ;-)
Your hint brings me back to the beginning: I want to control the position/size of the signature with OpenOffice by placing a special placeholder at the desired place and I couldn't find a way in OpenOffice for adding a signature field. I already found out, that the command "form.removeField(key, pagenr);" should be able to remove a field (in my case the button) but the problem with invalid signatures when clicked once still persists. In the meantime I realized that the following lines solve the problem: stamper.setFormFlattening(true); stamper.partialFormFlattening(key); So I use still a button as placeholder and during the signing process this button is flattened. This results in a signature that is valid an remains valid when clicked. :-) best regards & thanx a lot for your help Tom Bruno Lowagie (iText) wrote: > > Baer wrote: >> Hi Bruno, >> >> thanx for the answer; a button is an excellent placeholder and I get the >> position with the code you provided. >> >> Nevertheless, there is one drawback when I place the signature over the >> button: >> >> When I open such a pdf document with Acrobat Reader (tried with version >> 7.0.9), it displays a valid signature. >> >> When I click on this valid signature it flickers shortly and displays an >> INVALID signature because the document was modified after signing. >> >> Since everything worked fine, before I added this modification, I'm sure >> that the reason is the button. > > I didn't know you were talking about a digital signature. > I had just done a project where I had to put a gif file > with a signature (an image not a digital signature) on a PDF. > > If we're talking about a digital signature, please have a > look at these examples: > http://1t3xt.info/examples/browse/?page=example&id=251 > http://1t3xt.info/examples/browse/?page=example&id=252 > The first example adds an unsigned signature field; > the second one replaces this empty field by a digital > signature. You don't have to worry about coordinates > if you do it this way. > > br, > Bruno > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > iText-questions mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Do you like iText? > Buy the iText book: http://www.1t3xt.com/docs/book.php > Or leave a tip: https://tipit.to/itexttipjar > > -- View this message in context: http://www.nabble.com/Set-Signature-at-a-particular-position-tp17304458p17466599.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Do you like iText? Buy the iText book: http://www.1t3xt.com/docs/book.php Or leave a tip: https://tipit.to/itexttipjar
