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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="gtk-migrating-unique-GtkApplication"></a>Migrating from libunique to GApplication or GtkApplication</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><a href="gtk-migrating-unique-GtkApplication.html#id-1.6.5.5">Uniqueness</a></dt>
<dt><a href="ch28s02.html">Commands and Messages</a></dt>
</dl></div>

 libunique offers 'unique application' support as well as ways to
 communicate with a running application instance. This is implemented
 in various ways, either using D-Bus, or socket-based communication.
 

 Starting with GLib 2.26, D-Bus support has been integrated into GIO
 in the form of GDBus, and <a href="/usr/share/gtk-doc/html/gio/GApplication.html#GApplication-struct">GApplication</a> has been added to provide
 the same level of application support as libunique.
 
<div class="example">
<a name="id-1.6.5.4"></a>Example 52. A unique application
<div class="example-contents">
Here is a simple application using libunique:
 
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 <td class="listing_code"><pre class="programlisting">int
main (int argc, char *argv[])
{
 UniqueApp *app;
 GtkWidget *window;

gtk_init (&argc, &argv);

app = unique_app_new ("org.gtk.TestApplication", NULL);

if (unique_app_is_running (app))
 {
 UniqueResponse response;

response = unique_app_send_message (app, UNIQUE_ACTIVATE, NULL);
 g_object_unref (app);

return response == UNIQUE_RESPONSE_OK ? 0 : 1;
 }

window = create_my_window ();

unique_app_watch_window (app, GTK_WINDOW (window));

gtk_widget_show (window);

gtk_main ();

g_object_unref (app);

return 0;
}</pre></td>
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</div>

The same application using GtkApplication:

<div class="informalexample">
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 <td class="listing_code"><pre class="programlisting">static void
activate (GtkApplication *app)
{
 GList *list;
 GtkWidget *window;

list = gtk_application_get_windows (app);

if (list)
 {
 gtk_window_present (GTK_WINDOW (list->data));
 }
 else
 {
 window = create_my_window ();
 gtk_window_set_application (GTK_WINDOW (window), app);
 gtk_widget_show (window);
 }
}

int
main (int argc, char *argv[])
{
 GtkApplication *app;
 gint status;

app = gtk_application_new ("org.gtk.TestApplication", 0);
 g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);

status = g_application_run (G_APPLICATION (app), argc, argv);

g_object_unref (app);

return status;
}</pre></td>
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</div>
</div>
 <div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.6.5.5"></a>Uniqueness</h2></div></div></div>

 Instead of creating a UniqueApp with unique_app_new(), create
 a <a href="/usr/share/gtk-doc/html/gio/GApplication.html#GApplication-struct">GApplication</a> with <a href="/usr/share/gtk-doc/html/gio/GApplication.html#g-application-new"><code class="function">g_application_new()</code></a> or a <a class="link" href="GtkApplication.html" title="GtkApplication">GtkApplication</a>
 with <a class="link" href="GtkApplication.html#gtk-application-new" title="gtk_application_new ()"><code class="function">gtk_application_new()</code></a>. The <code>name</code> that was used with
 <code class="function">unique_app_new()</code> is very likely usable as the <code>application_id</code> for
 <a href="/usr/share/gtk-doc/html/gio/GApplication.html#g-application-new"><code class="function">g_application_new()</code></a> without any changes, and GtkApplication passes
 the <code class="envar">DESKTOP_STARTUP_ID</code> environment variable
 automatically.
 

 While libunique expects you to check for an already running instance
 yourself and activate it manually, GApplication handles all this on
 its own in <a href="/usr/share/gtk-doc/html/gio/GApplication.html#g-application-run"><code class="function">g_application_run()</code></a>. If you still need to find out if there
 is a running instance of your application, use
 <a href="/usr/share/gtk-doc/html/gio/GApplication.html#g-application-get-is-remote"><code class="function">g_application_get_is_remote()</code></a> instead of <code class="function">unique_app_is_running()</code>.
 
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