Re: [Vala] Binding a function that return a structure, not a pointer

[Darren Warner <vala-list dazwin com>]

I have a more complete, though surely less tested libexif.vapi if anyone 
is interested (vala-gen-introspect created a respectable .gi file even 
though libexif is not GObject-based).

I'm happy to maintain these files until they are a part of vala or the 
libexif package, though admittedly I am using them simply to pull GPS 
data out of images rather than anything more graphic-intensive.

Where is the best place to put these files (as an attachment here? 
bugzilla?)

-Darren


On 04/12/2010 10:57 AM, Jim Nelson wrote:
> Just to add to this, I've created a VAPI for libexif we use in Shotwell.
> I've not submitted it because it's incomplete.  You might want to check it
> out:
>
> http://trac.yorba.org/browser/shotwell/trunk/vapi/libexif.vapi
>
> -- Jim
>
> On Mon, Apr 12, 2010 at 5:05 AM, Abderrahim Kitouni<a kitouni gmail com>wrote:
>
>
> > Hi,
> >
> > 2010/4/11 Luca Bruno<lethalman88 gmail com>:
> >
> > > On Sat, Apr 10, 2010 at 04:58:06PM -0700, Darren Warner wrote:
> > >
> > > > I'm creating a vapi for libexif (using vala-gen-introspect) which
> > > > includes a function that returns a structure:
> > > >
> > > > typedef struct {ExifLong numerator; ExifLong denominator; }ExifRational;
> > > > ExifRational  exif_get_rational  (const unsigned char *b,
> > > > ExifByteOrder order);
> > > >
> > > > If I don't alter ExifRational in my .metadata, the C compiler
> > > > complains about assigning ExifRational to ExifRational * when I try
> > > > to use the function.
> > > >
> > > > If I set ExifRational is_value_type="1", which I believe I should
> > > > be, valac is generating an additional parameter (a pointer to a
> > > > temporary ExifRational) when calling exif_get_rational() - of course
> > > > the compiler complains at this also.
> > > >
> > > > This seems like a newbie question, but I've been unable to find any
> > > > similar examples in the existing bindings, so any help would be
> > > > appreciated.
> > > I might be wrong but it looks like it's used like a simple type.
> > > Try adding [SimpleType] to your struct binding, e.g.:
> > or in the metadata file :
> >
> > ExifRational is_value_type="1" simple_type="1"
> >
> > HTH,
> > Abderrahim
> > _______________________________________________
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>
>
>
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