Re: [Tracker] Using tracker extractors from other applications

[Nikolaus Rath <Nikolaus rath org>]

Martyn Russell <martyn-bhGbAngMcJvQT0dZR+AlfA public gmane org> writes:
> On 17/11/10 00:02, Nikolaus Rath wrote:
> > Hello,
>
> Hi,
>
> > I would like to use tracker's apparently quite extensive data-extraction
> > facilities in my own program. It seems that "tracker-extract -f<file>"
> > provides all the functionality that I want, but I am wondering if there
> > is a way to avoid having to re-parse output.
>
> The -f command line is a convenience for testing. There is a d-bus API
> you can use which tracker-miner-fs uses, for the spec see:
>
> http://git.gnome.org/browse/tracker/tree/data/dbus/tracker-extract.xml
>
> For examples, see how miner-fs uses it:
>
> http://git.gnome.org/browse/tracker/tree/src/miners/fs/tracker-miner-files.c#n2045

Ok, I came up with the following code:

    bus = dbus.SessionBus()
    proxy = bus.get_object('org.freedesktop.Tracker1.Extract', 
                           '/org/freedesktop/Tracker1/Extract')
    tracker = dbus.Interface(proxy, 'org.freedesktop.Tracker1.Extract')
    tracker.GetMetadata('file:///home/nikratio/misc/Transaktionen.ods',
                        'application/vnd.oasis.opendocument.spreadsheet')

This gives me the following result:                        
    
(dbus.String(u''),
 dbus.String(u' a nfo:PaginatedTextDocument ;\n\t nie:contentCreated
 "2009-11-07T20:21:16" ;\n\t nco:publisher [ a nco:Contact ;\n\t
 nco:fullname "Nikolaus Rath"] ;\n\t nie:generator
 "OpenOffice.org/3.2$Linux OpenOffice.org_project/320m12$Build-9483"
 ;\n\t nie:plainTextContent "\\n  ////Datum[....]'))


So it seems that I still have to parse the entire string. Is there a way
to get the data in more structured form?

Also, with a plain text document
 
    tracker.GetMetadata('file:///home/nikratio/misc/Victoria.tex', 'text/plain')

I do not get any contents:

(dbus.String(u''), dbus.String(u' a nfo:PlainTextDocument .\n'))

Am I doing something wrong?


And finally, is there a way to omit the mime type and have tracker
determine it automatically?


Thanks!

   -Nikolaus

-- 
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