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227 lines
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<title>Migrating from libunique to GApplication or GtkApplication: GTK+ 3 Reference Manual</title>
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<div class="chapter">
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<div class="titlepage"><div><div><h2 class="title">
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<a name="gtk-migrating-unique-GtkApplication"></a>Migrating from libunique to GApplication or GtkApplication</h2></div></div></div>
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<div class="toc"><dl class="toc">
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<dt><span class="section"><a href="gtk-migrating-unique-GtkApplication.html#id-1.6.5.5">Uniqueness</a></span></dt>
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<dt><span class="section"><a href="ch28s02.html">Commands and Messages</a></span></dt>
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</dl></div>
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<p>
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libunique offers 'unique application' support as well as ways to
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communicate with a running application instance. This is implemented
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in various ways, either using D-Bus, or socket-based communication.
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</p>
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<p>
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Starting with GLib 2.26, D-Bus support has been integrated into GIO
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in the form of GDBus, and <span class="type">GApplication</span> has been added to provide
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the same level of application support as libunique.
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</p>
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<div class="example">
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<a name="id-1.6.5.4"></a><p class="title"><b>Example 52. A unique application</b></p>
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<div class="example-contents">
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<p>Here is a simple application using libunique:
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</p>
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<div class="informalexample">
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<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
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<tbody>
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<tr>
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<td class="listing_lines" align="right"><pre>1
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32</pre></td>
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<td class="listing_code"><pre class="programlisting"><span class="kt">int</span><span class="w"></span>
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<span class="nf">main</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">argv</span><span class="p">[])</span><span class="w"></span>
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<span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="n">UniqueApp</span><span class="w"> </span><span class="o">*</span><span class="n">app</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="n">GtkWidget</span><span class="w"> </span><span class="o">*</span><span class="n">window</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="n">gtk_init</span><span class="w"> </span><span class="p">(</span><span class="o">&</span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">argv</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="n">app</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unique_app_new</span><span class="w"> </span><span class="p">(</span><span class="s">"org.gtk.TestApplication"</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">unique_app_is_running</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">))</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="n">UniqueResponse</span><span class="w"> </span><span class="n">response</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="n">response</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">unique_app_send_message</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">,</span><span class="w"> </span><span class="n">UNIQUE_ACTIVATE</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="n">g_object_unref</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">response</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">UNIQUE_RESPONSE_OK</span><span class="w"> </span><span class="o">?</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="w"> </span><span class="n">window</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">create_my_window</span><span class="w"> </span><span class="p">();</span><span class="w"></span>
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<span class="w"> </span><span class="n">unique_app_watch_window</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">,</span><span class="w"> </span><span class="n">GTK_WINDOW</span><span class="w"> </span><span class="p">(</span><span class="n">window</span><span class="p">));</span><span class="w"></span>
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<span class="w"> </span><span class="n">gtk_widget_show</span><span class="w"> </span><span class="p">(</span><span class="n">window</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="n">gtk_main</span><span class="w"> </span><span class="p">();</span><span class="w"></span>
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<span class="w"> </span><span class="n">g_object_unref</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span>
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<span class="p">}</span><span class="w"></span></pre></td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>
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The same application using GtkApplication:
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</p>
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<div class="informalexample">
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<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
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<tbody>
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<tr>
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<td class="listing_lines" align="right"><pre>1
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35</pre></td>
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<td class="listing_code"><pre class="programlisting"><span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"></span>
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<span class="nf">activate</span><span class="w"> </span><span class="p">(</span><span class="n">GtkApplication</span><span class="w"> </span><span class="o">*</span><span class="n">app</span><span class="p">)</span><span class="w"></span>
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<span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="n">GList</span><span class="w"> </span><span class="o">*</span><span class="n">list</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="n">GtkWidget</span><span class="w"> </span><span class="o">*</span><span class="n">window</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gtk_application_get_windows</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">list</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="n">gtk_window_present</span><span class="w"> </span><span class="p">(</span><span class="n">GTK_WINDOW</span><span class="w"> </span><span class="p">(</span><span class="n">list</span><span class="o">-></span><span class="n">data</span><span class="p">));</span><span class="w"></span>
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<span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="w"> </span><span class="k">else</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="n">window</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">create_my_window</span><span class="w"> </span><span class="p">();</span><span class="w"></span>
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<span class="w"> </span><span class="n">gtk_window_set_application</span><span class="w"> </span><span class="p">(</span><span class="n">GTK_WINDOW</span><span class="w"> </span><span class="p">(</span><span class="n">window</span><span class="p">),</span><span class="w"> </span><span class="n">app</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="n">gtk_widget_show</span><span class="w"> </span><span class="p">(</span><span class="n">window</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="p">}</span><span class="w"></span>
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<span class="kt">int</span><span class="w"></span>
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<span class="nf">main</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">argv</span><span class="p">[])</span><span class="w"></span>
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<span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="n">GtkApplication</span><span class="w"> </span><span class="o">*</span><span class="n">app</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="n">gint</span><span class="w"> </span><span class="n">status</span><span class="p">;</span><span class="w"></span>
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<span class="w"> </span><span class="n">app</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gtk_application_new</span><span class="w"> </span><span class="p">(</span><span class="s">"org.gtk.TestApplication"</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="n">g_signal_connect</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">,</span><span class="w"> </span><span class="s">"activate"</span><span class="p">,</span><span class="w"> </span><span class="n">G_CALLBACK</span><span class="w"> </span><span class="p">(</span><span class="n">activate</span><span class="p">),</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">g_application_run</span><span class="w"> </span><span class="p">(</span><span class="n">G_APPLICATION</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">),</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="n">argv</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="n">g_object_unref</span><span class="w"> </span><span class="p">(</span><span class="n">app</span><span class="p">);</span><span class="w"></span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">status</span><span class="p">;</span><span class="w"></span>
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<span class="p">}</span><span class="w"></span></pre></td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>
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</p>
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</div>
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</div>
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<br class="example-break"><div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="id-1.6.5.5"></a>Uniqueness</h2></div></div></div>
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<p>
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Instead of creating a UniqueApp with unique_app_new(), create
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a <span class="type">GApplication</span> with <code class="function">g_application_new()</code> or a <a class="link" href="GtkApplication.html" title="GtkApplication"><span class="type">GtkApplication</span></a>
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with <a class="link" href="GtkApplication.html#gtk-application-new" title="gtk_application_new ()"><code class="function">gtk_application_new()</code></a>. The <em class="parameter"><code>name</code></em> that was used with
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<code class="function">unique_app_new()</code> is very likely usable as the <em class="parameter"><code>application_id</code></em> for
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<code class="function">g_application_new()</code> without any changes, and GtkApplication passes
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the <code class="envar">DESKTOP_STARTUP_ID</code> environment variable
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automatically.
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</p>
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<p>
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While libunique expects you to check for an already running instance
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yourself and activate it manually, GApplication handles all this on
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its own in <code class="function">g_application_run()</code>. If you still need to find out if there
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is a running instance of your application, use
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<code class="function">g_application_get_is_remote()</code> instead of <code class="function">unique_app_is_running()</code>.
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</p>
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||
</div>
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