Re: new trickery / acrobat 6

[Jens-Uwe Morawski <morawski@gmx.net>]

On Wed, 09 Jul 2003 16:47:39 -0400
Hans Hagen <pragma@wxs.nl> wrote:

> At 00:16 09/07/2003 +0200, you wrote:
> >maybe \setupattachments[symbol=objectnumber] could be implemented?!
> 
> I added \PDFattachmentnumber
> 
> \definesymbol
>    [ObjectNumber]
>    [object number \PDFattachmentnumber]

this works not exactly how i would expect it:

---
\setupinteraction[state=start]

\useattachment[whatever][test1.txt]

\definesymbol
   [ObjectNumber]
   [object number \PDFattachmentnumber]

\setupattachments[symbol={ObjectNumber}]

\starttext \attachment[whatever] \stoptext
---

gives "object number 7" written in the PDF file, but the
object that contains the _real_ data stream is object 6, not 7:
6 0 obj <<
/Length 20        
>>
stream
Das ist Testdatei 1
endstream
endobj
7 0 obj
<< /Type /Filespec /F (test1.txt) /EF <</F 6 0 R>> >>
endobj

thus, in order to get the correct obj number for pdftosrc one
need the number of the stream-object.

another thing that might be useful is that \PDFattachmentnumber
should read the attachment name as argument and return the obj-number.

the above symbol could then be defined as:
\definesymbol
   [ObjectNumber]
   [object number \PDFattachmentnumber[\currentattachment]]

_and_ one can use it inside the text:

\starttext
This PDF-document has the file test1.txt attached. Users of pdftosrc
can extract the PDF-object \PDFattachmentnumber[whatever] to
get the file.
\stoptext

Regards,
  Jens