Re: new trickery / acrobat 6

[Hans Hagen <pragma@wxs.nl>]

At 16:22 10/07/2003 +0200, you wrote:

>\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.

hm, pdftosrc should probably accept both as valid numbers (i.e. in case of 
no 7 resolve it to 6), so if there's someone out there willing to patch ...

>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

this is kind of tricky, since we're never sure if forward or backward 
referencing takes place (apart form the fact that this kind of trickery can 
seldom b eimplemented in a clean way). Anyhow, since i happen to be doing 
things with attachments currently you're lucky; i made you:

\starttext

\definesymbol
   [ObjectNumber]
% [object number {\PDFattachmentnumber[xx]}]
   [object number \PDFattachmentnumber]

\useattachment[test][xx][test.tex]
\setupattachments[symbol=ObjectNumber]
\attachment[test]

\stoptext

(in case of just two args, i.e. no [xx], you need to feed the filename, 
i.e. test.txt)

I'll send you the patched spec file (keep in mind that this 
\PDFattachmentnumber is some driver functionality, and not something of teh 
core).

Hans
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                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
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