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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Boxed Types Serialization</title>
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<a href="#json-glib-Boxed-Types-Serialization.synopsis" class="shortcut">Top</a>
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<a href="#json-glib-Boxed-Types-Serialization.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry" title="Boxed Types Serialization">
<a name="json-glib-Boxed-Types-Serialization"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="json-glib-Boxed-Types-Serialization.top_of_page"></a>Boxed Types Serialization</span></h2>
<p>Boxed Types Serialization — Serialize and deserialize GBoxed types</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="json-glib-Boxed-Types-Serialization.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> * (<a class="link" href="json-glib-Boxed-Types-Serialization.html#JsonBoxedSerializeFunc" title="JsonBoxedSerializeFunc ()">*JsonBoxedSerializeFunc</a>) (<a
href="../glib/glib-Basic-Types.html#gconstpointer"
>gconstpointer</a> boxed);
<a
href="../glib/glib-Basic-Types.html#gpointer"
>gpointer</a> (<a class="link" href="json-glib-Boxed-Types-Serialization.html#JsonBoxedDeserializeFunc" title="JsonBoxedDeserializeFunc ()">*JsonBoxedDeserializeFunc</a>) (<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> *node);
void <a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-register-serialize-func" title="json_boxed_register_serialize_func ()">json_boxed_register_serialize_func</a> (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> node_type,
<a class="link" href="json-glib-Boxed-Types-Serialization.html#JsonBoxedSerializeFunc" title="JsonBoxedSerializeFunc ()">JsonBoxedSerializeFunc</a> serialize_func);
void <a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-register-deserialize-func" title="json_boxed_register_deserialize_func ()">json_boxed_register_deserialize_func</a>
(<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> node_type,
<a class="link" href="json-glib-Boxed-Types-Serialization.html#JsonBoxedDeserializeFunc" title="JsonBoxedDeserializeFunc ()">JsonBoxedDeserializeFunc</a> deserialize_func);
<a
href="../glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-can-serialize" title="json_boxed_can_serialize ()">json_boxed_can_serialize</a> (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> *node_type);
<a
href="../glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-can-deserialize" title="json_boxed_can_deserialize ()">json_boxed_can_deserialize</a> (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> node_type);
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> * <a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-serialize" title="json_boxed_serialize ()">json_boxed_serialize</a> (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a
href="../glib/glib-Basic-Types.html#gconstpointer"
>gconstpointer</a> boxed);
<a
href="../glib/glib-Basic-Types.html#gpointer"
>gpointer</a> <a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-deserialize" title="json_boxed_deserialize ()">json_boxed_deserialize</a> (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> *node);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="json-glib-Boxed-Types-Serialization.description"></a><h2>Description</h2>
<p>
GLib's <span class="type">GBoxed</span> type is a generic wrapper for arbitrary C structures.
</p>
<p>
JSON-GLib allows serialization and deserialization of a <span class="type">GBoxed</span> type
by registering functions mapping a <a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType"><span class="type">JsonNodeType</span></a> to a specific
<a
href="../gobject/gobject-Type-Information.html#GType"
><span class="type">GType</span></a>.
</p>
<p>
When registering a <span class="type">GBoxed</span> type you should also register the
corresponding transformation functions, e.g.:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
GType
my_struct_get_type (void)
{
static GType boxed_type = 0;
if (boxed_type == 0)
{
boxed_type =
g_boxed_type_register_static (g_intern_static_string ("MyStruct"),
(GBoxedCopyFunc) my_struct_copy,
(GBoxedFreeFunc) my_struct_free);
json_boxed_register_serialize_func (boxed_type, JSON_NODE_OBJECT,
my_struct_serialize);
json_boxed_register_deserialize_func (boxed_type, JSON_NODE_OBJECT,
my_struct_deserialize);
}
return boxed_type;
}
</pre></div>
<p>
</p>
<p>
The serialization function will be invoked by <a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-serialize" title="json_boxed_serialize ()"><code class="function">json_boxed_serialize()</code></a>:
it will be passed a pointer to the C structure and it must return a
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>. The deserialization function will be invoked by
<a class="link" href="json-glib-Boxed-Types-Serialization.html#json-boxed-deserialize" title="json_boxed_deserialize ()"><code class="function">json_boxed_deserialize()</code></a>: it will be passed a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> for the
declared type and it must return a newly allocated C structure.
</p>
<p>
It is possible to check whether a <span class="type">GBoxed</span> type can be deserialized
from a specific <a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType"><span class="type">JsonNodeType</span></a>, and whether a <span class="type">GBoxed</span> can be serialized
and to which specific <a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType"><span class="type">JsonNodeType</span></a>.</p>
<p>
</p>
</div>
<div class="refsect1" title="Details">
<a name="json-glib-Boxed-Types-Serialization.details"></a><h2>Details</h2>
<div class="refsect2" title="JsonBoxedSerializeFunc ()">
<a name="JsonBoxedSerializeFunc"></a><h3>JsonBoxedSerializeFunc ()</h3>
<pre class="programlisting"><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> * (*JsonBoxedSerializeFunc) (<a
href="../glib/glib-Basic-Types.html#gconstpointer"
>gconstpointer</a> boxed);</pre>
<p>
Serializes the passed <span class="type">GBoxed</span> and stores it inside a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a></p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>boxed</code></em> :</span></p></td>
<td> a <span class="type">GBoxed</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly created <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2" title="JsonBoxedDeserializeFunc ()">
<a name="JsonBoxedDeserializeFunc"></a><h3>JsonBoxedDeserializeFunc ()</h3>
<pre class="programlisting"><a
href="../glib/glib-Basic-Types.html#gpointer"
>gpointer</a> (*JsonBoxedDeserializeFunc) (<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> *node);</pre>
<p>
Deserializes the contents of the passed <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> into a <span class="type">GBoxed</span></p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>node</code></em> :</span></p></td>
<td> a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly created boxed type
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2" title="json_boxed_register_serialize_func ()">
<a name="json-boxed-register-serialize-func"></a><h3>json_boxed_register_serialize_func ()</h3>
<pre class="programlisting">void json_boxed_register_serialize_func (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> node_type,
<a class="link" href="json-glib-Boxed-Types-Serialization.html#JsonBoxedSerializeFunc" title="JsonBoxedSerializeFunc ()">JsonBoxedSerializeFunc</a> serialize_func);</pre>
<p>
Registers a serialization function for a <span class="type">GBoxed</span> of type <em class="parameter"><code>gboxed_type</code></em>
to a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> of type <em class="parameter"><code>node_type</code></em></p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gboxed_type</code></em> :</span></p></td>
<td> a boxed type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>node_type</code></em> :</span></p></td>
<td> a node type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>serialize_func</code></em> :</span></p></td>
<td> serialization function for <em class="parameter"><code>boxed_type</code></em> into
a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> of type <em class="parameter"><code>node_type</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2" title="json_boxed_register_deserialize_func ()">
<a name="json-boxed-register-deserialize-func"></a><h3>json_boxed_register_deserialize_func ()</h3>
<pre class="programlisting">void json_boxed_register_deserialize_func
(<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> node_type,
<a class="link" href="json-glib-Boxed-Types-Serialization.html#JsonBoxedDeserializeFunc" title="JsonBoxedDeserializeFunc ()">JsonBoxedDeserializeFunc</a> deserialize_func);</pre>
<p>
Registers a deserialization function for a <span class="type">GBoxed</span> of type <em class="parameter"><code>gboxed_type</code></em>
from a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> of type <em class="parameter"><code>node_type</code></em></p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gboxed_type</code></em> :</span></p></td>
<td> a boxed type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>node_type</code></em> :</span></p></td>
<td> a node type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>deserialize_func</code></em> :</span></p></td>
<td> deserialization function for <em class="parameter"><code>boxed_type</code></em> from
a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> of type <em class="parameter"><code>node_type</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2" title="json_boxed_can_serialize ()">
<a name="json-boxed-can-serialize"></a><h3>json_boxed_can_serialize ()</h3>
<pre class="programlisting"><a
href="../glib/glib-Basic-Types.html#gboolean"
>gboolean</a> json_boxed_can_serialize (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> *node_type);</pre>
<p>
Checks whether it is possible to serialize a <span class="type">GBoxed</span> of
type <em class="parameter"><code>gboxed_type</code></em> into a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>. The type of the
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> is placed inside <em class="parameter"><code>node_type</code></em> if the function
returns <code class="literal">TRUE</code> and it's undefined otherwise.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gboxed_type</code></em> :</span></p></td>
<td> a boxed type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>node_type</code></em> :</span></p></td>
<td>out. <acronym title="Parameter for returning results. Default is transfer-full."><span class="acronym">out</span></acronym>. </td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> if the type can be serialized,
and <code class="literal">FALSE</code> otherwise.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2" title="json_boxed_can_deserialize ()">
<a name="json-boxed-can-deserialize"></a><h3>json_boxed_can_deserialize ()</h3>
<pre class="programlisting"><a
href="../glib/glib-Basic-Types.html#gboolean"
>gboolean</a> json_boxed_can_deserialize (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNodeType" title="enum JsonNodeType">JsonNodeType</a> node_type);</pre>
<p>
Checks whether it is possible to deserialize a <span class="type">GBoxed</span> of
type <em class="parameter"><code>gboxed_type</code></em> from a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> of type <em class="parameter"><code>node_type</code></em></p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gboxed_type</code></em> :</span></p></td>
<td> a boxed type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>node_type</code></em> :</span></p></td>
<td> a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> type
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> if the type can be deserialized, <code class="literal">FALSE</code> otherwise
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2" title="json_boxed_serialize ()">
<a name="json-boxed-serialize"></a><h3>json_boxed_serialize ()</h3>
<pre class="programlisting"><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> * json_boxed_serialize (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a
href="../glib/glib-Basic-Types.html#gconstpointer"
>gconstpointer</a> boxed);</pre>
<p>
Serializes <em class="parameter"><code>boxed</code></em>, a pointer to a <span class="type">GBoxed</span> of type <em class="parameter"><code>gboxed_type</code></em>,
into a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a></p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gboxed_type</code></em> :</span></p></td>
<td> a boxed type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>boxed</code></em> :</span></p></td>
<td> a pointer to a <span class="type">GBoxed</span> of type <em class="parameter"><code>gboxed_type</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> with the serialization of the boxed
type, or <code class="literal">NULL</code> if serialization either failed or was not
possible
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2" title="json_boxed_deserialize ()">
<a name="json-boxed-deserialize"></a><h3>json_boxed_deserialize ()</h3>
<pre class="programlisting"><a
href="../glib/glib-Basic-Types.html#gpointer"
>gpointer</a> json_boxed_deserialize (<a
href="../gobject/gobject-Type-Information.html#GType"
>GType</a> gboxed_type,
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode">JsonNode</a> *node);</pre>
<p>
Deserializes <em class="parameter"><code>node</code></em> into a <span class="type">GBoxed</span> of <em class="parameter"><code>gboxed_type</code></em></p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gboxed_type</code></em> :</span></p></td>
<td> a boxed type
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>node</code></em> :</span></p></td>
<td> a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the newly allocated <span class="type">GBoxed</span>. Use <a
href="../gobject/gobject-Boxed-Types.html#g-boxed-free"
><code class="function">g_boxed_free()</code></a> to
release the resources allocated by this function
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10</p>
</div>
</div>
</div>
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