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

[Lei Miao <leimiao09 gmail com>]

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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