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gtk-migrating-unique-GtkApplication.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Migrating from libunique to GApplication or GtkApplication: GTK+ 3 Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GTK+ 3 Reference Manual"> <link rel="up" href="migrating.html" title="Part V. Migrating from Previous Versions of GTK+"> <link rel="prev" href="gtk-migrating-GtkStyleContext-bonus-points.html" title="Bonus points"> <link rel="next" href="ch28s02.html" title="Commands and Messages"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="migrating.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="gtk-migrating-GtkStyleContext-bonus-points.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="ch28s02.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <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><span class="section"><a href="gtk-migrating-unique-GtkApplication.html#id-1.6.5.5">Uniqueness</a></span></dt> <dt><span class="section"><a href="ch28s02.html">Commands and Messages</a></span></dt> </dl></div> <p> 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. </p> <p> 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"><span class="type">GApplication</span></a> has been added to provide the same level of application support as libunique. </p> <div class="example"> <a name="id-1.6.5.4"></a><p class="title"><b>Example 52. A unique application</b></p> <div class="example-contents"> <p>Here is a simple application using libunique: </p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32</pre></td> <td class="listing_code"><pre class="programlisting"><span class="kt">int</span> <span class="nf">main</span> <span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span> <span class="n">UniqueApp</span> <span class="o">*</span><span class="n">app</span><span class="p">;</span> <span class="n">GtkWidget</span> <span class="o">*</span><span class="n">window</span><span class="p">;</span> <span class="n">gtk_init</span> <span class="p">(</span><span class="o">&</span><span class="n">argc</span><span class="p">,</span> <span class="o">&</span><span class="n">argv</span><span class="p">);</span> <span class="n">app</span> <span class="o">=</span> <span class="n">unique_app_new</span> <span class="p">(</span><span class="s">"org.gtk.TestApplication"</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span> <span class="k">if</span> <span class="p">(</span><span class="n">unique_app_is_running</span> <span class="p">(</span><span class="n">app</span><span class="p">))</span> <span class="p">{</span> <span class="n">UniqueResponse</span> <span class="n">response</span><span class="p">;</span> <span class="n">response</span> <span class="o">=</span> <span class="n">unique_app_send_message</span> <span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="n">UNIQUE_ACTIVATE</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span> <span class="n">g_object_unref</span> <span class="p">(</span><span class="n">app</span><span class="p">);</span> <span class="k">return</span> <span class="n">response</span> <span class="o">==</span> <span class="n">UNIQUE_RESPONSE_OK</span> <span class="o">?</span> <span class="mi">0</span> <span class="o">:</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span> <span class="n">window</span> <span class="o">=</span> <span class="n">create_my_window</span> <span class="p">();</span> <span class="n">unique_app_watch_window</span> <span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="n">GTK_WINDOW</span> <span class="p">(</span><span class="n">window</span><span class="p">));</span> <span class="n">gtk_widget_show</span> <span class="p">(</span><span class="n">window</span><span class="p">);</span> <span class="n">gtk_main</span> <span class="p">();</span> <span class="n">g_object_unref</span> <span class="p">(</span><span class="n">app</span><span class="p">);</span> <span class="k">return</span> <span class="mi">0</span><span class="p">;</span> <span class="p">}</span></pre></td> </tr> </tbody> </table> </div> <p> The same application using GtkApplication: </p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35</pre></td> <td class="listing_code"><pre class="programlisting"><span class="k">static</span> <span class="kt">void</span> <span class="nf">activate</span> <span class="p">(</span><span class="n">GtkApplication</span> <span class="o">*</span><span class="n">app</span><span class="p">)</span> <span class="p">{</span> <span class="n">GList</span> <span class="o">*</span><span class="n">list</span><span class="p">;</span> <span class="n">GtkWidget</span> <span class="o">*</span><span class="n">window</span><span class="p">;</span> <span class="n">list</span> <span class="o">=</span> <span class="n">gtk_application_get_windows</span> <span class="p">(</span><span class="n">app</span><span class="p">);</span> <span class="k">if</span> <span class="p">(</span><span class="n">list</span><span class="p">)</span> <span class="p">{</span> <span class="n">gtk_window_present</span> <span class="p">(</span><span class="n">GTK_WINDOW</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="p">}</span> <span class="k">else</span> <span class="p">{</span> <span class="n">window</span> <span class="o">=</span> <span class="n">create_my_window</span> <span class="p">();</span> <span class="n">gtk_window_set_application</span> <span class="p">(</span><span class="n">GTK_WINDOW</span> <span class="p">(</span><span class="n">window</span><span class="p">),</span> <span class="n">app</span><span class="p">);</span> <span class="n">gtk_widget_show</span> <span class="p">(</span><span class="n">window</span><span class="p">);</span> <span class="p">}</span> <span class="p">}</span> <span class="kt">int</span> <span class="nf">main</span> <span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span> <span class="n">GtkApplication</span> <span class="o">*</span><span class="n">app</span><span class="p">;</span> <span class="n">gint</span> <span class="n">status</span><span class="p">;</span> <span class="n">app</span> <span class="o">=</span> <span class="n">gtk_application_new</span> <span class="p">(</span><span class="s">"org.gtk.TestApplication"</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span> <span class="n">g_signal_connect</span> <span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="s">"activate"</span><span class="p">,</span> <span class="n">G_CALLBACK</span> <span class="p">(</span><span class="n">activate</span><span class="p">),</span> <span class="nb">NULL</span><span class="p">);</span> <span class="n">status</span> <span class="o">=</span> <span class="n">g_application_run</span> <span class="p">(</span><span class="n">G_APPLICATION</span> <span class="p">(</span><span class="n">app</span><span class="p">),</span> <span class="n">argc</span><span class="p">,</span> <span class="n">argv</span><span class="p">);</span> <span class="n">g_object_unref</span> <span class="p">(</span><span class="n">app</span><span class="p">);</span> <span class="k">return</span> <span class="n">status</span><span class="p">;</span> <span class="p">}</span></pre></td> </tr> </tbody> </table> </div> <p> </p> </div> </div> <br class="example-break"><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> <p> Instead of creating a UniqueApp with unique_app_new(), create a <a href="/usr/share/gtk-doc/html/gio/GApplication.html#GApplication-struct"><span class="type">GApplication</span></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"><span class="type">GtkApplication</span></a> 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 <code class="function">unique_app_new()</code> is very likely usable as the <em class="parameter"><code>application_id</code></em> 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. </p> <p> 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>. </p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>