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

[Lei Miao <leimiao09 gmail com>]

Yes, I tried it, but it has no effect.

I have the following in my vala code:
...
[CCode (vfunc = "get_type")]
public URIType get_uri_type (Type type) { return URIType.SRC; }
...

Is it what you recommended?

Basically, the problem is that "iface->get_type =..." is missing in 
"...gst_uri_handler_interface_init()" function in the generated c file.

Regards,

LM

On 3/16/2014 10:37 AM, Luca Bruno wrote:
> 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 
> <mailto: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 <mailto: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 <mailto: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  <mailto: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
> >                 <mailto: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
> >                     <mailto: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
> >                         <http://references.valadoc.org/#%21api=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
> >                         ------------------------------------------------------------------------
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