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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Libbonobo Reference Manual: bonobo-context</title>
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="10"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 
                  <a href="#libbonobo-bonobo-context.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#libbonobo-bonobo-context.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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</tr></table>
<div class="refentry">
<a name="libbonobo-bonobo-context"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libbonobo-bonobo-context.top_of_page"></a>bonobo-context</span></h2>
<p>bonobo-context — Extensible runtime service interface</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libbonobo-bonobo-context.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">Bonobo_Unknown</span>
</td>
<td class="function_name">
<a class="link" href="libbonobo-bonobo-context.html#bonobo-context-get" title="bonobo_context_get ()">bonobo_context_get</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libbonobo-bonobo-context.html#bonobo-context-add" title="bonobo_context_add ()">bonobo_context_add</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libbonobo-bonobo-object.html#BonoboObject"><span class="returnvalue">BonoboObject</span></a> *
</td>
<td class="function_name">
<a class="link" href="libbonobo-bonobo-context.html#bonobo-context-running-get" title="bonobo_context_running_get ()">bonobo_context_running_get</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libbonobo-bonobo-context.html#bonobo-running-context-auto-exit-unref" title="bonobo_running_context_auto_exit_unref ()">bonobo_running_context_auto_exit_unref</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-context.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-context.description"></a><h2>Description</h2>
<p>
The bonobo-context code is designed to provide a way to
expose CORBA contexts through a single C interface. This
is so that language bindings can get away with wrapping
a single function, and yet have access to the whole
Bonobo service framework. Two examples of this are the
MonikerContext and the RunningContext ( see
Bonobo_Context.idl ).
</p>
<p>
  </p>
<div class="example">
<a name="id-1.2.7.5.3.1"></a><p class="title"><b>Example 1. Getting and using the moniker context</b></p>
<div class="example-contents"><pre class="programlisting">
Bonobo_MonikerContext context;
Bonobo_Unknown        object;
context = bonobo_context_get ("Activation", NULL);
if (context == CORBA_OBJECT_NIL)
	g_error (_("Internal error, no activation context"));
object = Bonobo_MonikerContext_getObject (
	"file:/demo/a.jpeg", "Bonobo/Control", ev);
...
     </pre></div>
</div>
<p><br class="example-break">
</p>
<p>
The list of contexts is open and may be expanded in the future,
currently there are the following:
  </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
        Activation - Bonobo/MonikerContext
      </p></li>
<li class="listitem"><p>
        Running - Bonobo/RunningContext
      </p></li>
</ul></div>
<p>
</p>
<p>
The running context is particularly useful for ensuring that
server processes exit cleanly when all their objects and
derived objects are dead. To do this we can simply do the
following:
</p>
<p>
  </p>
<div class="example">
<a name="id-1.2.7.5.6.1"></a><p class="title"><b>Example 2. How to get a factory to quit when it is idle</b></p>
<div class="example-contents"><pre class="programlisting">
static void
last_unref_exit_cb (gpointer      context,
		    BonoboObject *factory)
{
        bonobo_object_unref (factory);
	gtk_main_quit ();
}
...
int main (int argc, char **argv)
{
	...
	bonobo_running_context_ignore_object (BONOBO_OBJREF (object));
	gtk_signal_connect (GTK_OBJECT (bonobo_context_running_get ()),
			    "last_unref", last_unref_exit_cb, factory);
	...
	bonobo_main ();
}
    </pre></div>
</div>
<p><br class="example-break">
</p>
<p>
  Since this is a commonly used thing there is a helper to make this
easier:
  </p>
<div class="example">
<a name="id-1.2.7.5.7.1"></a><p class="title"><b>Example 3. How to get a factory to quit when it is idle</b></p>
<div class="example-contents"><pre class="programlisting">
bonobo_running_context_auto_exit_unref (factory)
    </pre></div>
</div>
<p><br class="example-break">
</p>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-context.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="bonobo-context-get"></a><h3>bonobo_context_get ()</h3>
<pre class="programlisting"><span class="returnvalue">Bonobo_Unknown</span>
bonobo_context_get (<em class="parameter"><code>const <span class="type">CORBA_char</span> *context_name</code></em>,
                    <em class="parameter"><code><span class="type">CORBA_Environment</span> *opt_ev</code></em>);</pre>
<p>The most useful context is named 'Activation' and returns
the IDL:Bonobo/ActivationContext:1.0 interface.</p>
<div class="refsect3">
<a name="id-1.2.7.6.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>context_name</p></td>
<td class="parameter_description"><p>the name of the context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>opt_ev</p></td>
<td class="parameter_description"><p>optional Environment, or NULL</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.7.6.2.6"></a><h4>Returns</h4>
<p> a new reference to a global Bonobo context or CORBA_OBJECT_NIL</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bonobo-context-add"></a><h3>bonobo_context_add ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
bonobo_context_add (<em class="parameter"><code>const <span class="type">CORBA_char</span> *context_name</code></em>,
                    <em class="parameter"><code><span class="type">Bonobo_Unknown</span> context</code></em>);</pre>
<p>This function adds a new context to the context system</p>
<div class="refsect3">
<a name="id-1.2.7.6.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>context_name</p></td>
<td class="parameter_description"><p>the name to refer to the context by</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>context</p></td>
<td class="parameter_description"><p>The Bonobo_Unknown; a ref. is taken on this.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bonobo-context-running-get"></a><h3>bonobo_context_running_get ()</h3>
<pre class="programlisting"><a class="link" href="libbonobo-bonobo-object.html#BonoboObject"><span class="returnvalue">BonoboObject</span></a> *
bonobo_context_running_get (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
</p>
<div class="refsect3">
<a name="id-1.2.7.6.4.5"></a><h4>Returns</h4>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bonobo-running-context-auto-exit-unref"></a><h3>bonobo_running_context_auto_exit_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
bonobo_running_context_auto_exit_unref
                               (<em class="parameter"><code><a class="link" href="libbonobo-bonobo-object.html#BonoboObject"><span class="type">BonoboObject</span></a> *object</code></em>);</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-context.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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