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

[Lei Miao <leimiao09 gmail com>]

That worked! Thank you so much for the help!

I still have a related question though:

In the following function in the generated c code,

static gchar**my_streaming_source_real_get_protocols (GstURIHandler* 
base, GType type, int* result_length1) {
    MyStreamingSource * self;
    gchar** result = NULL;
    gchar** _tmp0_ = NULL;
    gint _tmp0__length1 = 0;
    self = (MyStreamingSource*) base;
    _tmp0_ = MY_STREAMING_SOURCE_protocols;
    _tmp0__length1 = G_N_ELEMENTS (MY_STREAMING_SOURCE_protocols);
    if (result_length1) {
        *result_length1 = _tmp0__length1;
    }
    result = _tmp0_;
    return result;
}

the last argument "int* result_length1" somehow is causing seg faults. 
If I remove this argument manually, then the problem goes away.

I was wondering why this argument is added, since in the vapi, I only have:

        [CCode (array_length = false, array_null_terminated = true)]
        public abstract unowned string[] get_protocols (GLib.Type type);

and in the vala code, I have

"public unowned string[] get_protocols(Type type) { return protocols; }" 
where "protocols" is a string array.

Is there a way to remove this argument in the generated c code?

Regards,

LM

On 3/18/2014 4:35 AM, Luca Bruno wrote:
> On 17/03/2014 20:29, Lei Miao wrote:
> > Thanks for pointing out the typo.
> >
> > Unfortunately, it doesn't resolve the problem.
> >
> > Below is what I have right now in gstreamer-1.0.vapi:
> >
> >     [CCode (cheader_filename = "gst/gst.h", type_cname = 
> > "GstURIHandlerInterface", type_id = "gst_uri_handler_get_type ()")]
> >     public interface URIHandler : GLib.Object {
> >         [CCode (array_length = false, array_null_terminated = true)]
> >         public abstract unowned string[] get_protocols (GLib.Type type);
> >         public abstract string get_uri ();
> >         [CCode (vfunc_name = "get_type")]
> >         public abstract Gst.URIType get_uri_type (GLib.Type type);
> >         public abstract bool set_uri (string uri) throws GLib.Error;
> >     }
> >
> > In the generated c file, I have:
> >
> > iface->get_protocols = (gchar** (*)(GstURIHandler*, GType)) ...
> > iface->get_uri_type = (GstURIType (*)(GstURIHandler*, GType)) ...
> > iface->get_uri = (gchar* (*)(GstURIHandler*)) ...
> > iface->set_uri = (gboolean (*)(GstURIHandler*, const gchar*, 
> > GError**)) ...
> >
> > It won't compile due to the following error:
> > error: 'GstURIHandlerInterface' has no member named 'get_uri_type'
> >
> > If I manually change "iface->get_uri_type" to "iface->get_type", then 
> > it compiles.
> Mh ok. Try putting vfunc_name also when implementing the method.