g_variant_builder_new使用

 static void ListExtraVideoDirectories(cDBusObject *Object, GVariant *Parameters, GDBusMethodInvocation *Invocation)
  {
    int replyCode = 500;
    cString replyMessage = "Missing extra-video-directories patch";
    cStringList dirs;
#ifdef EXTRA_VIDEO_DIRECTORIES_PATCH
    if (!LockExtraVideoDirectories(false)) {
       replyCode = 550;
       replyMessage = "Unable to lock extra video directory list";
       }
    else {
       if (ExtraVideoDirectories.Size() == 0) {
          replyCode = 550;
          replyMessage = "no extra video directories in list";
          }
       else {
          replyCode = 250;
          replyMessage = "";
          for (int i = 0; i < ExtraVideoDirectories.Size(); i++)
              dirs.Append(strdup(ExtraVideoDirectories.At(i)));
          }
       UnlockExtraVideoDirectories();
       }
#endif
    GVariantBuilder *builder = g_variant_builder_new(G_VARIANT_TYPE("(isas)"));
    g_variant_builder_add(builder, "i", replyCode);
    g_variant_builder_add(builder, "s", *replyMessage);
    GVariantBuilder *array = g_variant_builder_new(G_VARIANT_TYPE("as"));
    for (int i = 0; i < dirs.Size(); i++)
        g_variant_builder_add(array, "s", dirs.At(i));
    g_variant_builder_add_value(builder, g_variant_builder_end(array));
    g_dbus_method_invocation_return_value(Invocation, g_variant_builder_end(builder));
    g_variant_builder_unref(array);
    g_variant_builder_unref(builder);
  };

　　

 static void List(cDBusObject *Object, GVariant *Parameters, GDBusMethodInvocation *Invocation)
  {
    if (g_strcmp0(g_dbus_method_invocation_get_interface_name(Invocation), DBUS_VDR_PLUGIN_INTERFACE) == 0)
       esyslog("dbus2vdr: use of deprecated interface: 'List' should be called with the interface '%s'!", DBUS_VDR_PLUGINMANAGER_INTERFACE);

#define EMPTY(s) (s == NULL ? "" : s)
    GVariantBuilder *array = g_variant_builder_new(G_VARIANT_TYPE("a(ss)"));
    int index = 0;
    do
    {
      cPlugin *plugin = cPluginManager::GetPlugin(index);
      if (plugin == NULL)
         break;
      const char *name = plugin->Name();
      const char *version = plugin->Version();
      g_variant_builder_add(array, "(ss)", EMPTY(name), EMPTY(version));
      index++;
    } while (true);
#undef EMPTY

    GVariantBuilder *builder = g_variant_builder_new(G_VARIANT_TYPE("(a(ss))"));
    g_variant_builder_add_value(builder, g_variant_builder_end(array));
    g_dbus_method_invocation_return_value(Invocation, g_variant_builder_end(builder));
    g_variant_builder_unref(array);
    g_variant_builder_unref(builder);
  }