dbus-glib 和 GDBus 的区别

• dbus-glib uses the libdbus reference implementation, GDBus doesn‘t. Instead, it relies on GIO streams as transport layer, and has its own implementation for the the D-Bus connection setup and authentication. Apart from using streams as transport, avoiding libdbus also lets GDBus avoid some thorny multithreading issues.

        dbus-glib使用 libdbus reference implementation,GDBus不使用,而是依赖GIO流作为传输层,并且拥有一套自己实现的D-Bus连接设置和授权的方法.暂且不说GDBus使用流传输,

        不使用libdbus可以使GDBus没有一些多线程方面的问题.

• dbus-glib uses the GObject type system for method arguments and return values, including a homegrown container specialization mechanism. GDBus relies on the GVariant type system which is explicitly designed to match D-Bus types.

       dbus-glib的方法参数和返回值使用Gobject类型系统,其中包含了一个特定结构的自有容器.GDBus依赖专为匹配D-Bus类型而设计的GVariant类型系统

• dbus-glib models only D-Bus interfaces and does not provide any types for objects. GDBus models both D-Bus interfaces (via the GDBusInterface, GDBusProxy and GDBusInterfaceStub types) and objects (via the GDBusObject, GDBusObjectStub and GDBusObjectProxy types).

       dbus-glib 只能提供D-Bus接口,不为对象提供任何类型,

       GDBus同时提供D-Bus接口(通过GDBusInterface, GDBusProxy 和 GDBusInterfaceStub 类型)和对象(通过GDBusObject, GDBusObjectStub 和 GDBusObjectProxy 类型)

• GDBus includes native support for the org.freedesktop.DBus.Properties (via the GDBusProxy type) and org.freedesktop.DBus.ObjectManager D-Bus interfaces, dbus-glib doesn‘t.

       GDBus 为org.freedesktop.DBus.Properties (via the GDBusProxy type) 和 org.freedesktop.DBus.ObjectManager D-Bus接口,包含了本地支持,dbus-glib没有.

• The typical way to export an object in dbus-glib involves generating glue code from XML introspection data using dbus-binding-tool. GDBus provides a similar tool called gdbus-codegen that can also generate Docbook D-Bus interface documentation. 

       dbus-glib中导出对象的典型方法是使用dbus-binding-tool根据XML内省数据生成代码,GDBus也提供了一个类似的工具叫做gdbus-codegen,这个工具也可以生成Docbook D-Bus接口文件.        

• dbus-glib doesn‘t provide any convenience API for owning and watching bus names, GDBus provides the g_bus_own_name() and g_bus_watch_name() family of convenience functions.

       dbus-glib不提供战友和监视总线名字的方便的API,GDBus提供了g_bus_own_name() 和g_bus_watch_name() 系列的方便函数.

• GDBus provides API to parse, generate and work with Introspection XML, dbus-glib doesn‘t.

        GDBus提供API来解析、生成 和 工作的内省XML，dbus-glib不提供。

Owning bus names

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error = NULL;
res = dbus_g_proxy_call (system_bus_proxy,
                         "RequestName",
                         &error,
                         G_TYPE_STRING, NAME_TO_CLAIM,
                         G_TYPE_UINT,   DBUS_NAME_FLAG_ALLOW_REPLACEMENT,
                         G_TYPE_INVALID,
                         G_TYPE_UINT,   &result,
                         G_TYPE_INVALID);
if (!res)
  {
    if (error != NULL)
      {
        g_warning ("Failed to acquire %s: %s",
                   NAME_TO_CLAIM, error->message);
        g_error_free (error);
      }
    else
      {
        g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
      }
    goto out;
  }

if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)
  {
    if (error != NULL)
      {
        g_warning ("Failed to acquire %s: %s",
                   NAME_TO_CLAIM, error->message);
        g_error_free (error);
      }
    else
      {
        g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
      }
    exit (1);
  }

dbus_g_proxy_add_signal (system_bus_proxy, "NameLost",
                         G_TYPE_STRING, G_TYPE_INVALID);
dbus_g_proxy_connect_signal (system_bus_proxy, "NameLost",
                             G_CALLBACK (on_name_lost), NULL, NULL);

/* further setup ... */

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static void
on_name_acquired (GDBusConnection *connection,
                  const gchar     *name,
                  gpointer         user_data)
{
  /* further setup ... */
}

/* ... */

  owner_id = g_bus_own_name (G_BUS_TYPE_SYSTEM,
                             NAME_TO_CLAIM,
                             G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT,
                             on_bus_acquired,
                             on_name_acquired,
                             on_name_lost,
                             NULL,
                             NULL);

  g_main_loop_run (loop);

  g_bus_unown_name (owner_id);

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proxy = dbus_g_proxy_new_for_name (system_bus_connection,
                                   "org.freedesktop.Accounts",
                                   "/org/freedesktop/Accounts",
                                   "org.freedesktop.Accounts");

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error = NULL;
proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
                                       G_DBUS_PROXY_FLAGS_NONE,
                                       NULL, /* GDBusInterfaceInfo */
                                       "org.freedesktop.Accounts",
                                       "/org/freedesktop/Accounts",
                                       "org.freedesktop.Accounts",
                                       NULL, /* GCancellable */
                                       &error);