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

[Abderrahim Kitouni <a kitouni gmail com>]

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