227 lines
12 KiB
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227 lines
12 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Migrating from libunique to GApplication or GtkApplication: GTK+ 3 Reference Manual</title>
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<link rel="home" href="index.html" title="GTK+ 3 Reference Manual">
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<link rel="up" href="migrating.html" title="Part V. Migrating from Previous Versions of GTK+">
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<link rel="prev" href="gtk-migrating-GtkStyleContext-bonus-points.html" title="Bonus points">
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<link rel="next" href="ch28s02.html" title="Commands and Messages">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
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<td width="100%" align="left" class="shortcuts"></td>
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<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
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<td><a accesskey="u" href="migrating.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
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<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>
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<td><a accesskey="n" href="ch28s02.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
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</tr></table>
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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 <a href="../gio/GApplication.html#GApplication-struct"><span class="type">GApplication</span></a> 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="gtkdoc kwb">int</span>
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<span class="function">main</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">*</span>argv<span class="gtkdoc opt">[])</span>
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<span class="gtkdoc opt">{</span>
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UniqueApp <span class="gtkdoc opt">*</span>app<span class="gtkdoc opt">;</span>
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GtkWidget <span class="gtkdoc opt">*</span>window<span class="gtkdoc opt">;</span>
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<span class="function"><a href="gtk3-General.html#gtk-init">gtk_init</a></span> <span class="gtkdoc opt">(&</span>argc<span class="gtkdoc opt">, &</span>argv<span class="gtkdoc opt">);</span>
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app <span class="gtkdoc opt">=</span> <span class="function">unique_app_new</span> <span class="gtkdoc opt">(</span><span class="string">"org.gtk.TestApplication"</span><span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
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<span class="keyword">if</span> <span class="gtkdoc opt">(</span><span class="function">unique_app_is_running</span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">))</span>
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<span class="gtkdoc opt">{</span>
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UniqueResponse response<span class="gtkdoc opt">;</span>
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response <span class="gtkdoc opt">=</span> <span class="function">unique_app_send_message</span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">,</span> UNIQUE_ACTIVATE<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
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<span class="function"><a href="../gobject/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">);</span>
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<span class="keyword">return</span> response <span class="gtkdoc opt">==</span> UNIQUE_RESPONSE_OK <span class="gtkdoc opt">?</span> <span class="number">0</span> <span class="gtkdoc opt">:</span> <span class="number">1</span><span class="gtkdoc opt">;</span>
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<span class="gtkdoc opt">}</span>
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window <span class="gtkdoc opt">=</span> <span class="function">create_my_window</span> <span class="gtkdoc opt">();</span>
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<span class="function">unique_app_watch_window</span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">,</span> <span class="function">GTK_WINDOW</span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">));</span>
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<span class="function"><a href="GtkWidget.html#gtk-widget-show">gtk_widget_show</a></span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">);</span>
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<span class="function"><a href="gtk3-General.html#gtk-main">gtk_main</a></span> <span class="gtkdoc opt">();</span>
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<span class="function"><a href="../gobject/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">);</span>
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<span class="keyword">return</span> <span class="number">0</span><span class="gtkdoc opt">;</span>
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<span class="gtkdoc opt">}</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="gtkdoc kwb">static void</span>
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<span class="function">activate</span> <span class="gtkdoc opt">(</span>GtkApplication <span class="gtkdoc opt">*</span>app<span class="gtkdoc opt">)</span>
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<span class="gtkdoc opt">{</span>
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GList <span class="gtkdoc opt">*</span>list<span class="gtkdoc opt">;</span>
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GtkWidget <span class="gtkdoc opt">*</span>window<span class="gtkdoc opt">;</span>
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list <span class="gtkdoc opt">=</span> <span class="function"><a href="GtkApplication.html#gtk-application-get-windows">gtk_application_get_windows</a></span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">);</span>
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<span class="keyword">if</span> <span class="gtkdoc opt">(</span>list<span class="gtkdoc opt">)</span>
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<span class="gtkdoc opt">{</span>
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<span class="function"><a href="GtkWindow.html#gtk-window-present">gtk_window_present</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_WINDOW</span> <span class="gtkdoc opt">(</span>list<span class="gtkdoc opt">-></span>data<span class="gtkdoc opt">));</span>
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<span class="gtkdoc opt">}</span>
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<span class="keyword">else</span>
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<span class="gtkdoc opt">{</span>
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window <span class="gtkdoc opt">=</span> <span class="function">create_my_window</span> <span class="gtkdoc opt">();</span>
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<span class="function"><a href="GtkWindow.html#gtk-window-set-application">gtk_window_set_application</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_WINDOW</span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">),</span> app<span class="gtkdoc opt">);</span>
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<span class="function"><a href="GtkWidget.html#gtk-widget-show">gtk_widget_show</a></span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">);</span>
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<span class="gtkdoc opt">}</span>
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<span class="gtkdoc opt">}</span>
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<span class="gtkdoc kwb">int</span>
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<span class="function">main</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">*</span>argv<span class="gtkdoc opt">[])</span>
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<span class="gtkdoc opt">{</span>
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GtkApplication <span class="gtkdoc opt">*</span>app<span class="gtkdoc opt">;</span>
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gint status<span class="gtkdoc opt">;</span>
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app <span class="gtkdoc opt">=</span> <span class="function"><a href="GtkApplication.html#gtk-application-new">gtk_application_new</a></span> <span class="gtkdoc opt">(</span><span class="string">"org.gtk.TestApplication"</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">);</span>
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<span class="function"><a href="../gobject/gobject-Signals.html#g-signal-connect">g_signal_connect</a></span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">,</span> <span class="string">"activate"</span><span class="gtkdoc opt">,</span> <span class="function"><a href="../gobject/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>activate<span class="gtkdoc opt">),</span> NULL<span class="gtkdoc opt">);</span>
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status <span class="gtkdoc opt">=</span> <span class="function"><a href="../gio/GApplication.html#g-application-run">g_application_run</a></span> <span class="gtkdoc opt">(</span><span class="function">G_APPLICATION</span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">),</span> argc<span class="gtkdoc opt">,</span> argv<span class="gtkdoc opt">);</span>
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<span class="function"><a href="../gobject/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>app<span class="gtkdoc opt">);</span>
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<span class="keyword">return</span> status<span class="gtkdoc opt">;</span>
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<span class="gtkdoc opt">}</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 <a href="../gio/GApplication.html#GApplication-struct"><span class="type">GApplication</span></a> with <a href="../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>
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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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<a href="../gio/GApplication.html#g-application-new"><code class="function">g_application_new()</code></a> 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 <a href="../gio/GApplication.html#g-application-run"><code class="function">g_application_run()</code></a>. 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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<a href="../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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</p>
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</div>
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</div>
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