[Nepomuk] Retrieve "linked" artwork file

[Ignacio Serantes]

On Tue, Oct 18, 2011 at 10:54 AM, <daitheflu at free.fr> wrote:

> Hi,
>
> Thanks Sebastian, that helped me *a lot*.
>
> I checked with NepomukShell and discovered that my artwork Resource had no
> NIE:url !
> I thought that the constructor would have automatically set it but it
> didn't, and it does not.
>
> Since the following wasn't sufficient :
>
>    img = Nepomuk.Resource(coverpath, OntologiesUrls.image())
>
> I just added :
>
>    img = Nepomuk.Resource(coverpath, OntologiesUrls.image())
>    img.setProperty(OntologiesUrls.url(), coverpath)
>
> And that did the trick :)
> It's now working like a charm !
>
>
>
> As for your Python tool that generate ontologies, that could be very
> interesting.
> I could have write one by myself, but I was too lazy. So I just hardcoded
> the one I needed.
> If yours is not too difficult to understand and if you're OK, I could maybe
> maintain it.
>

I write one my own but is not a class is a function an its usage is:

* NOC('nie:url')*
*
*
or
*
*
*NOC('nie:url', True)*
*
*
if you want the result was a QUrl.

You need to know the ontology but few is hardcoded so function is almost
automantained.

<--------------------------->
*knownOntologies = [ \*
*                    ['nao', '2007/08/15'], ['ncal', '2007/04/02'], \*
*                    ['nco', '2007/03/22'], ['nexif', '2007/05/10'], \*
*                    ['nfo', '2007/03/22'], ['nid3', '2007/05/10'], \*
*                    ['nie', '2007/01/19'], ['nmm', '2009/02/19'], \*
*                    ['nmo', '2007/03/22'], ['nrl', '2007/08/15'], \*
*                    ['pimo', '2007/11/01'], ['tmo',  '2008/05/20'] \*
*                ]*
*
*
*# Nepomuk Ontology Converter.*
*def NOC(name = '', returnQUrl = False):*
*    ontology, property = name.strip().split(':')*
*    date = lvalue(knownOntologies, ontology, 0, 1)*
*    if date != None:*
*        value = 'http://www.semanticdesktop.org/ontologies/%s/%s#%s' %
(date, ontology, property)*
*
*
*    else:*
*        value = 'Soprano.Vocabulary.%s.%s().toString()' %
(ontology.upper(), property)*
*        try:*
*            value = eval(value)*
*
*
*        except:*
*            value = ''*
*
*
*    if returnQUrl:*
*        return QUrl(value)*
*
*
*    else:*
*        return value*
<--------------------------->




> Thanks again for your help.
>
> Cheers,
>
> --
> François
>
>
>
> ----- Mail original -----
> De: "Sebastian Trüg" <trueg at kde.org>
> À: nepomuk at kde.org
> Envoyé: Lundi 17 Octobre 2011 20:24:54
> Objet: Re: [Nepomuk] Retrieve "linked" artwork file
>
> On 10/17/2011 04:20 PM, daitheflu at free.fr wrote:
> > Hi guys,
> >
> > Me again. I'd like my application to link some file as an artwork for a
> Movie Type Resource.
> > The artwork consists in a .png file, stored in some directory (that's not
> the important point).
> >
> > Here is how I "link" the file to the artwork "property" of the Movie
> Resource (Python code, but you'll understand) :
> >
> > ***
> >
> > # self.artwork is a QPixmap containg the artwork.
> >
> > if not self.artwork.isNull():
> >     # SNIP : saves the cover to `coverpath`.
> >     # `coverpath` is a KUrl instance.
> >
> >     # Build a Resource of type NFO:image from the saved picture :
> >     img = Nepomuk.Resource(coverpath, OntologiesUrls.image())
>
> This reminds me that I have a python tool somewhere which generates
> ontology methods for python... have to look for it...
>
> >     # "Links" that NFO:image Resource to the NMM:artwork property of my
> Movie Resource :
> >     resource.setProperty(OntologiesUrls.artwork(), Nepomuk.Variant(img))
> >
> > ***
> >
> >
> > The problem is to get the .png file back. Here is what I tried :
> >
> >
> > ***
> >
> > # Get the Resource linked by the NMM:artwork property :
> > artwork = resource.property(OntologiesUrls.artwork())
> >
> > if artwork.isValid():
> >     imgResource = artwork.toResource()
> >     res.artwork = PictureLoader.load_pixmap(imgResource.toFile().url())
> >
> > ***
> >
> > The problem is that `imgResource.toFile().url()` returns an empty KUrl.
> >
> > Am I missing something ? What did I misunderstood ? How can I retrieve
> and load the linked artwork file ?
>
> it looks correct. Maybe use nepomukshell to look at the resources to
> make sure. You can use a query like "select * where { ?r nmm:artwork ?v
> . }" and then double-click on the resource.
>
> Cheers,
> Sebastian
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>



-- 
Best wishes,
Ignacio
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