GStreamer-sharp signals and events

[Sebastian Dröge]

On Mo, 2011-12-05 at 01:53 -0800, Ralph wrote:
> Ralph wrote
> > 
> > I'm developing a C# WPF application using OSSBuild and gstreamersharp.
> > I have a problem listening to signals generated by playbin2.
> > This is what I do:
> > 
> > In the constructor:
> >       Gst.BasePlugins.PlayBin2 playBin = new Gst.BasePlugins.PlayBin2();
> >       playBin.AboutToFinish += OnAboutToFinish;
> > 
> > Somewhere else:
> >       private void OnAboutToFinish(object o, Gst.GLib.SignalArgs args)
> >       {
> >           //supply the next file
> >           playBin.Uri = nextFileName;
> >       }
> > 
> > 
> > The problem is that even if OnAboutToFinish method contains no code, the
> > program crashes.
> > I found that in other languages (Python, for example) the event handler
> > always returns TRUE.  Unfortunately setting args.RetVal to true causes the
> > following exception:
> > 
> > Object reference not set to an instance of an object.
> >    at Gst.GLib.Value.set_Val(Object value)
> >    at Gst.DynamicSignal.OnMarshal(IntPtr closure, Value& retval, UInt32
> > argc, IntPtr argsPtr, IntPtr ihint, IntPtr data)
> > 
> > 
> > The same problem occurs if instead of using the .NET AboutToFinish event
> > of playbin2, I connect to about-to-finish signal using Connect method:
> >       playBin.Connect("about-to-finish", OnAboutToFinish);
> > 
> > 
> > How should I handle playbin2 signals?
> > 
> 
> 
> Does anyone have ANY idea why the program crashes when an event handler is
> attached to the event like AboutToFinish or VideoChanged?  It is really
> stopping me now, after a few weeks of development I got stuck and I don't
> know what to do.

Hi,

please file a bug in bugzilla at http://bugzilla.gnome.org . If possible
please attach a small testcase for this bug.
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