read PDF metadata from other file

read PDF metadata from other file

[Pablo Rodriguez via ntg-context]

Dear list,

I have the following sample:

  \starttext
  \setupinteraction
    [state=start,
     title={\cldcontext{pdfe.open("b.pdf").Info.Title}}]
  \null
  \stoptext

From a document composed with \insertpages, I need to transfer medatada.

But I get the raw value "feff0061" (which I guess it may be introduced
by lpdf.pdfunicode).

How can I get the pure text value, so I can transfer metadata from one
PDF document into another PDF document?

Many thanks for your help,

Pablo
--
http://www.ousia.tk
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___________________________________________________________________________________

Re: read PDF metadata from other file

[Hans Hagen via ntg-context]

On 9/11/2021 2:35 PM, Pablo Rodriguez via ntg-context wrote:
> Dear list,
> 
> I have the following sample:
> 
>    \starttext
>    \setupinteraction
>      [state=start,
>       title={\cldcontext{pdfe.open("b.pdf").Info.Title}}]
>    \null
>    \stoptext
> 
>  From a document composed with \insertpages, I need to transfer medatada.
> 
> But I get the raw value "feff0061" (which I guess it may be introduced
> by lpdf.pdfunicode).
> 
> How can I get the pure text value, so I can transfer metadata from one
> PDF document into another PDF document?
just use the better interface

\starttext

\startluacode
     function document.whatever(name)
         local p = lpdf.epdf.load(name)
         context(p.Info.Title)
         lpdf.epdf.unload(p)
     end
\stopluacode

and/or use the converter (but still you need to close the file)

\setupinteraction
   [state=start,
  % title=\cldcontext{lpdf.fromsixteen(pdfe.open("b.pdf").Info.Title)},
    title={\ctxlua{document.whatever("b.pdf")}}]

  %\cldcontext{lpdf.fromsixteen(pdfe.open("b.pdf").Info.Title)}
   \ctxlua{document.whatever("b.pdf")}

\stoptext

after which you enter wiki mode

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: read PDF metadata from other file

[Pablo Rodriguez via ntg-context]

On 9/11/21 6:16 PM, Hans Hagen via ntg-context wrote:
> On 9/11/2021 2:35 PM, Pablo Rodriguez via ntg-context wrote:
>> [...]
>> How can I get the pure text value, so I can transfer metadata from one
>> PDF document into another PDF document?
> just use the better interface
> [...]
> after which you enter wiki mode

Mamy thanks for your reply, Hans.

I think this might be simpler for me:

  \starttext
  \startluacode
  function document.transfer_metadata(name)
      local main_doc = lpdf.epdf.load(name)
      lpdf.addtocatalog("Lang", lpdf.string(main_doc.Catalog.Lang))
      lpdf.addtoinfo("Title", lpdf.unicode(main_doc.Info.Title))
      lpdf.addtoinfo("Subject", lpdf.unicode(main_doc.Info.Subject))
      lpdf.addtoinfo("Author", lpdf.unicode(main_doc.Info.Author))
      lpdf.epdf.unload(name)
  end
  \stopluacode
  \unexpanded\def\TransferMetadata#1%
    {\ctxlua{document.transfer_metadata("#1")}}
  \null
  \TransferMetadata{name.pdf}
  \stoptext

Added to
https://wiki.contextgarden.net/Interaction#Import_PDF_metadata_fields_from_other_PDF_documents.

Many thanks for your help,

Pablo
--
http://www.ousia.tk
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________