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<div class="titlepage"><div><div><h2 class="title">
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<a name="id-1.5.5"></a>Migrating to GDBus</h2></div></div></div>
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<dt><span class="section"><a href="ch32.html#id-1.5.5.2">Conceptual differences</a></span></dt>
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<dt><span class="section"><a href="ch32s02.html">API comparison</a></span></dt>
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<dt><span class="section"><a href="ch32s03.html">Owning bus names</a></span></dt>
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<dt><span class="section"><a href="ch32s04.html">Creating proxies for well-known names</a></span></dt>
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<dt><span class="section"><a href="ch32s05.html">Generating code and docs</a></span></dt>
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<dt><span class="section"><a href="ch32s05.html#gdbus-example-gdbus-codegen">Using gdbus-codegen</a></span></dt>
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<span class="refentrytitle"><a href="gdbus-org.gtk.GDBus.Example.ObjectManager.Animal.html">org.gtk.GDBus.Example.ObjectManager.Animal</a></span><span class="refpurpose"> — Example docs generated by gdbus-codegen</span>
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<span class="refentrytitle"><a href="gdbus-org.gtk.GDBus.Example.ObjectManager.Cat.html">org.gtk.GDBus.Example.ObjectManager.Cat</a></span><span class="refpurpose"> — More example docs generated by gdbus-codegen</span>
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<span class="refentrytitle"><a href="ExampleAnimal.html">ExampleAnimal</a></span><span class="refpurpose"> — Generated C code for the org.gtk.GDBus.Example.ObjectManager.Animal D-Bus interface</span>
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<span class="refentrytitle"><a href="ExampleCat.html">ExampleCat</a></span><span class="refpurpose"> — Generated C code for the org.gtk.GDBus.Example.ObjectManager.Cat D-Bus interface</span>
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<span class="refentrytitle"><a href="ExampleObject.html">ExampleObject</a></span><span class="refpurpose"> — Specialized GDBusObject types</span>
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<span class="refentrytitle"><a href="ExampleObjectManagerClient.html">ExampleObjectManagerClient</a></span><span class="refpurpose"> — Generated GDBusObjectManagerClient type</span>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="id-1.5.5.2"></a>Conceptual differences</h2></div></div></div>
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The central concepts of D-Bus are modelled in a very similar way
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in dbus-glib and GDBus. Both have a objects representing connections,
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proxies and method invocations. But there are some important
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem"><p>
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dbus-glib uses the <a class="ulink" href="http://www.freedesktop.org/wiki/Software/dbus#ReferenceImplementation.28dbus-daemonandlibdbus.29" target="_top">libdbus
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reference implementation</a>, GDBus doesn't. Instead, it
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relies on GIO streams as transport layer, and has its own
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implementation for the the D-Bus connection setup and
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authentication. Apart from using streams as transport,
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avoiding libdbus also lets GDBus avoid some thorny
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multithreading issues.
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<li class="listitem"><p>
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dbus-glib uses the GObject type system for method arguments and
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return values, including a homegrown container specialization
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mechanism. GDBus relies on the <a href="../glib/glib-GVariant.html#GVariant"><span class="type">GVariant</span></a> type system which is
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explicitly designed to match D-Bus types.
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<li class="listitem"><p>
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dbus-glib models only D-Bus interfaces and does not provide
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any types for objects. GDBus models both D-Bus interfaces
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(via the <a class="link" href="GDBusInterface.html" title="GDBusInterface"><span class="type">GDBusInterface</span></a>, <a class="link" href="GDBusProxy.html" title="GDBusProxy"><span class="type">GDBusProxy</span></a> and
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<a class="link" href="GDBusInterfaceSkeleton.html" title="GDBusInterfaceSkeleton"><span class="type">GDBusInterfaceSkeleton</span></a> types) and objects (via the
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<a class="link" href="GDBusObject.html" title="GDBusObject"><span class="type">GDBusObject</span></a>, <a class="link" href="GDBusObjectSkeleton.html" title="GDBusObjectSkeleton"><span class="type">GDBusObjectSkeleton</span></a> and <a class="link" href="GDBusObjectProxy.html" title="GDBusObjectProxy"><span class="type">GDBusObjectProxy</span></a> types).
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<li class="listitem"><p>
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GDBus includes native support for the <a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties" target="_top">org.freedesktop.DBus.Properties</a> (via the <a class="link" href="GDBusProxy.html" title="GDBusProxy"><span class="type">GDBusProxy</span></a> type) and <a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager" target="_top">org.freedesktop.DBus.ObjectManager</a> D-Bus interfaces, dbus-glib doesn't.
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<li class="listitem"><p>
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The typical way to export an object in dbus-glib involves
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generating glue code from XML introspection data using
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<span class="command"><strong>dbus-binding-tool</strong></span>. GDBus provides a
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similar tool called <span class="command"><strong><a href="gdbus-codegen.html">gdbus-codegen</a></strong></span> that
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can also generate Docbook D-Bus interface documentation.
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<li class="listitem"><p>
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dbus-glib doesn't provide any convenience API for owning and
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watching bus names, GDBus provides the <a class="link" href="gio-Owning-Bus-Names.html#g-bus-own-name" title="g_bus_own_name ()"><code class="function">g_bus_own_name()</code></a> and
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<a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a> family of convenience functions.
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<li class="listitem"><p>
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GDBus provides API to parse, generate and work with <a class="link" href="gio-D-Bus-Introspection-Data.html" title="D-Bus Introspection Data">Introspection
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XML</a>, dbus-glib doesn't.
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<li class="listitem"><p>
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GTestDBus provides API to create isolated unit tests <a class="link" href="GTestDBus.html#gio-D-Bus-Test-Scaffolding" title="Creating unit tests using GTestDBus">GDBus Test Scaffolding</a>.
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