Questions about tailoring libdmapsharing API to benefit GObject introspection

["W. Michael Petullo" <mike flyn org>]

I am the maintainer of libdmapsharing, a GObject-based library. I am
just now getting around to adjusting the library's API to better suit
GObject introspection. I am not sure how to process on two things having
to do with object properties.

One of my interfaces, the DAAPRecord, has among its properties two
items: hash, a GLib2 ByteArray/g_param_spec_pointer and mediakind, a
g_param_spec_enum. I am trying to implement an object of this interface in
Python, but I am not sure how to proceed with either of these properties.
(As I mentioned, I am willing to modify the libdmapsharing interface to
facilitate this if necessary.)

I am not sure how to best handle hash. Should I create a box type? It
seems like the should be a straightforward approach to handle a ByteArray.

For mediakind, I get a warning if I try this:

        class PyDAAPRecord((GObject.GObject, DAAP.Record, DMAP.Record):
            # ...
            mediakind = GObject.property(type=GObject.TYPE_INT, default=0)

So, I tried to use DMAP.MediaKind like this:

            mediakind = GObject.property(type=DMAP.MediaKind, default=0)

However, this causes:

          File "./test-dmap-client-python", line 31, in <module>
            class PyDAAPRecord(GObject.GObject, DAAP.Record, DMAP.Record):
          File "./test-dmap-client-python", line 51, in PyDAAPRecord
            mediakind   = GObject.property(type=DMAP.MediaKind  ,     default=0)
          File "/usr/lib64/python3.6/site-packages/gi/_propertyhelper.py", line 164, in __init__
            self._check_default()
          File "/usr/lib64/python3.6/site-packages/gi/_propertyhelper.py", line 315, in _check_default
            elif not _gobject.type_is_a(default, ptype):
        TypeError: could not get typecode from object

I generate dmap_media_kind_get_type using glib-mkenums, and the function
ends up containing:

        GType
        dmap_media_kind_get_type (void)
        {
          static GType etype = 0;
          if (etype == 0) {
            static const GEnumValue values[] = {
              { DMAP_MEDIA_KIND_MUSIC, "DMAP_MEDIA_KIND_MUSIC", "music" },
              { DMAP_MEDIA_KIND_MOVIE, "DMAP_MEDIA_KIND_MOVIE", "movie" },
              { DMAP_MEDIA_KIND_PODCAST, "DMAP_MEDIA_KIND_PODCAST", "podcast" },
              { DMAP_MEDIA_KIND_TV_SHOW, "DMAP_MEDIA_KIND_TV_SHOW", "tv-show" },
              { 0, NULL, NULL }
            };
            etype = g_enum_register_static ("DMAPMediaKind", values);
          }
          return etype;
        }

My .gir file contains:

        <enumeration name="MediaKind"
                 glib:type-name="DMAPMediaKind"
                 glib:get-type="dmap_media_kind_get_type"
                 c:type="DMAPMediaKind">
        <member name="music"
              value="1"
              c:identifier="DMAP_MEDIA_KIND_MUSIC"
              glib:nick="music">
        </member>
        <member name="movie"
              value="2"
              c:identifier="DMAP_MEDIA_KIND_MOVIE"
              glib:nick="movie">
        </member>
        <member name="podcast"
              value="32"
              c:identifier="DMAP_MEDIA_KIND_PODCAST"
              glib:nick="podcast">
        </member>
        <member name="tv_show"
              value="64"
              c:identifier="DMAP_MEDIA_KIND_TV_SHOW"
              glib:nick="tv-show">
        </member>
        </enumeration>

Any suggestions on either of these?

-- 
Mike

:wq