Re: [Vala] How to implement the get_type method of Gst.URIHandler interface in vala?

[Luca Bruno <lethalman88 gmail com>]

Why isn't [CCode (vfunc = "get_type")] related to it? Did you try already?


On Sun, Mar 16, 2014 at 3:07 PM, Lei Miao <leimiao09 gmail com> wrote:

>  Thank you for the information, but it doesn't seem to be related to my
> case.
>
> To be clear, I was referring to the following interface:
> struct GstURIHandlerInterface
>
> struct GstURIHandlerInterface {
>   GTypeInterface parent;
>
>   /* vtable */
>   /* querying capabilities */
>   GstURIType             (* get_type)           (GType type);
>   const gchar * const *  (* get_protocols)      (GType type);
>
>   /* using the interface */
>   gchar *                (* get_uri)            (GstURIHandler * handler);
>   gboolean               (* set_uri)            (GstURIHandler * handler,
>                                                  const gchar   * uri,
>                                                  GError       ** error);
> };
>
>
> It has the "get_type" method that needs to be implemented in my vala code.
> In gst_element_register() in gstelementfactory.c, it checks the type by
> calling get_type():
>
> ...
>     if (!iface || !iface->get_type || !iface->get_protocols)
>       goto urierror;
> ...
>
> Regards,
>
> LM
>
> On 3/16/2014 6:08 AM, Luca Bruno wrote:
>
> Try [CCode (vfunc = "get_type")] or such, see gio vapi for some examples
> about read_fn.
>
>
> On Sun, Mar 16, 2014 at 10:05 AM, Abderrahim Kitouni <a kitouni gmail com>wrote:
>
> > Hi,
> >
> > I've looked at thé gst docs and the vfunc for get_uri_type is called
> > get_type.
> >
> > HTH,
> >
> > On March 16, 2014 9:19:34 AM CET, Luca Bruno <lethalman88 gmail com>
> > wrote:
> > > I don't understand what you mean by gstreamer uses get_type, can you point
> > > to the specific C method?
> > >
> > >
> > > On Sat, Mar 15, 2014 at 4:05 PM, Lei Miao <leimiao09 gmail com> wrote:
> > >
> > >
> > > >  Thank you for the response.
> > > >
> > > >  I could implement get_uri_type, but the problem is that gstreamer uses
> > > >
> > > >  get_type.
> > > >
> > > >  If I can implement get_type in vala, then I don't have to modify gstreamer
> > > >  code.
> > > >
> > > >  Regards,
> > > >
> > > >  LM
> > > >  On Mar 14, 2014 5:30 PM, "Luca Bruno" <lethalman88 gmail com> wrote:
> > > >
> > > >
> > > > >  I don't understand why you are using get_type. Implement get_uri_type.
> > > > >
> > > > >
> > > > >  On Fri, Mar 14, 2014 at 10:21 PM, Lei Miao <leimiao09 gmail com> wrote:
> > > > >
> > > > >
> > > > > >  Hi,
> > > > > >
> > > > > >  I am trying to write a gstreamer 1.0 plugin using vala. However, I am
> > > > > >  having trouble to implement the get_type() method of the Gst.URIHandler
> > > > > >
> > > > > >  interface defined here:
> > > > > >
> > > > > >  
> > > > > > http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstUriHandler.html#GstURIHandlerInterface
> > > > > >
> > > > > >  .
> > > > > >
> > > > > >  In particular, my class inherits Gst.bin and implements Gst.URIHandler
> > > > > >  interface:
> > > > > >
> > > > > >   public class StreamingSource: Gst.Bin, Gst.URIHandler {
> > > > > >
> > > > > >  ...
> > > > > >
> > > > > >  public URIType get_type (Type type) { return URIType.SRC; }
> > > > > >
> > > > > >
> > > > > >  ...
> > > > > >  }
> > > > > >
> > > > > >  When I compile the vala code to c code, I get the following error:
> > > > > >
> > > > > >
> > > > > > StreamingSource.get_type hides inherited method `GLib.Object.get_type'.
> > > > > >  Use
> > > > > >  the `new' keyword if hiding was intentional
> > > > > >                  public URIType get_type (Type type) { return
> > > > > >  URIType.SRC; }
> > > > > >
> > > > > >
> > > > > >  The problem seems to be that GLib.Object also has a method called
> > > > > >  "get_type". So in this case, does anybody know how I can implement the
> > > > > >  "get_type" method of Gst.URIHandler?
> > > > > >
> > > > > >  It's worth noting that according to this link:
> > > > > >
> > > > > >  http://references.valadoc.org/#!api=gstreamer-1.0/Gst.URIHandler , the
> > > > > >  method is called get_uri_type() instead. This is inconsistent with the
> > > > > >
> > > > > >  gstreamer 1.0 reference manual. In fact, Gstreamer code has both methods
> > > > > >  defined, but it uses get_type() for element registration.
> > > > > >
> > > > > >  Regards,
> > > > > >
> > > > > >  LM
> > > > > > ------------------------------
> > > > > >
> > > > > >  vala-list mailing list
> > > > > >  vala-list gnome org
> > > > > >
> > > > > >  https://mail.gnome.org/mailman/listinfo/vala-list
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >  --
> > > > >  www.debian.org - The Universal Operating System
> > --
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>
>
>
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