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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<head>
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<title>JSON GVariant Integration</title>
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<a href="#json-glib-JSON-GVariant-Integration.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#json-glib-JSON-GVariant-Integration.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="json-glib-JSON-GVariant-Integration"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="json-glib-JSON-GVariant-Integration.top_of_page"></a>JSON GVariant Integration</span></h2>
<p>JSON GVariant Integration — Serialize and deserialize GVariant types</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="json-glib-JSON-GVariant-Integration.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="returnvalue">JsonNode</span></a> *          <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-serialize" title="json_gvariant_serialize ()">json_gvariant_serialize</a>             (<em class="parameter"><code><span class="type">GVariant</span> *variant</code></em>);
<span class="returnvalue">gchar</span> *             <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-serialize-data" title="json_gvariant_serialize_data ()">json_gvariant_serialize_data</a>        (<em class="parameter"><code><span class="type">GVariant</span> *variant</code></em>,
                                                         <em class="parameter"><code><span class="type">gsize</span> *length</code></em>);
<span class="returnvalue">GVariant</span> *          <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize" title="json_gvariant_deserialize ()">json_gvariant_deserialize</a>           (<em class="parameter"><code><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> *json_node</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *signature</code></em>,
                                                         <em class="parameter"><code><span class="type">GError</span> **error</code></em>);
<span class="returnvalue">GVariant</span> *          <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize-data" title="json_gvariant_deserialize_data ()">json_gvariant_deserialize_data</a>      (<em class="parameter"><code>const <span class="type">gchar</span> *json</code></em>,
                                                         <em class="parameter"><code><span class="type">gssize</span> length</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *signature</code></em>,
                                                         <em class="parameter"><code><span class="type">GError</span> **error</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="json-glib-JSON-GVariant-Integration.description"></a><h2>Description</h2>
<p>
Use <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-serialize" title="json_gvariant_serialize ()"><code class="function">json_gvariant_serialize()</code></a> and <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-serialize-data" title="json_gvariant_serialize_data ()"><code class="function">json_gvariant_serialize_data()</code></a> to
convert from any <span class="type">GVariant</span> value to a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> tree or its string
representation.
</p>
<p>
Use <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize" title="json_gvariant_deserialize ()"><code class="function">json_gvariant_deserialize()</code></a> and <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize-data" title="json_gvariant_deserialize_data ()"><code class="function">json_gvariant_deserialize_data()</code></a> to
obtain the <span class="type">GVariant</span> value from a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> tree or directly from a JSON
string.
Since many <span class="type">GVariant</span> data types cannot be directly represented as
JSON, a <span class="type">GVariant</span> type string (signature) should be provided to these
methods in order to obtain a correct, type-contrained result.
If no signature is provided, conversion can still be done, but the
resulting <span class="type">GVariant</span> value will be "guessed" from the JSON data types,
according to the following table:
</p>
<p>
</p>
<div class="table">
<a name="idp7269888"></a><p class="title"><b>Table 2. Default JSON to GVariant conversion (without signature constrains)</b></p>
<div class="table-contents"><table summary="Default JSON to GVariant conversion (without signature constrains)" border="1">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th align="left">JSON</th>
<th align="left">GVariant</th>
</tr></thead>
<tfoot>
<tr>
<th align="left">string</th>
<th align="left">string (s)</th>
</tr>
<tr>
<th align="left">int64</th>
<th align="left">int64 (x)</th>
</tr>
<tr>
<th align="left">boolean</th>
<th align="left">boolean (b)</th>
</tr>
<tr>
<th align="left">double</th>
<th align="left">double (d)</th>
</tr>
<tr>
<th align="left">array</th>
<th align="left">array of variants (av)</th>
</tr>
<tr>
<th align="left">object</th>
<th align="left">dictionary of string-variant (a{sv})</th>
</tr>
<tr>
<th align="left">null</th>
<th align="left">maybe variant (mv)</th>
</tr>
</tfoot>
</table></div>
</div>
<p><br class="table-break">
</p>
</div>
<div class="refsect1">
<a name="json-glib-JSON-GVariant-Integration.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="json-gvariant-serialize"></a><h3>json_gvariant_serialize ()</h3>
<pre class="programlisting"><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="returnvalue">JsonNode</span></a> *          json_gvariant_serialize             (<em class="parameter"><code><span class="type">GVariant</span> *variant</code></em>);</pre>
<p>
Converts <em class="parameter"><code>variant</code></em> to a JSON tree.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>variant</code></em> :</span></p></td>
<td>A <span class="type">GVariant</span> to convert</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> representing the root of the
JSON data structure obtained from <em class="parameter"><code>variant</code></em>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="json-gvariant-serialize-data"></a><h3>json_gvariant_serialize_data ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *             json_gvariant_serialize_data        (<em class="parameter"><code><span class="type">GVariant</span> *variant</code></em>,
                                                         <em class="parameter"><code><span class="type">gsize</span> *length</code></em>);</pre>
<p>
Converts <em class="parameter"><code>variant</code></em> to its JSON encoded string representation. This method
is actually a helper function. It uses <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-serialize" title="json_gvariant_serialize ()"><code class="function">json_gvariant_serialize()</code></a> to obtain the
JSON tree, and then <a class="link" href="JsonGenerator.html" title="JsonGenerator"><span class="type">JsonGenerator</span></a> to stringify it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>variant</code></em> :</span></p></td>
<td>A <span class="type">GVariant</span> to convert</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>Return location for the length of the returned
string, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The JSON encoded string corresponding to
<em class="parameter"><code>variant</code></em>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="json-gvariant-deserialize"></a><h3>json_gvariant_deserialize ()</h3>
<pre class="programlisting"><span class="returnvalue">GVariant</span> *          json_gvariant_deserialize           (<em class="parameter"><code><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> *json_node</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *signature</code></em>,
                                                         <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
Converts a JSON data structure to a GVariant value using <em class="parameter"><code>signature</code></em> to
resolve ambiguous data types. If no error occurs, the resulting <span class="type">GVariant</span>
is guaranteed to conform to <em class="parameter"><code>signature</code></em>.
</p>
<p>
If <em class="parameter"><code>signature</code></em> is not <code class="literal">NULL</code> but does not represent a valid GVariant type
string, <code class="literal">NULL</code> is returned and error is set to <code class="literal">G_IO_ERROR_INVALID_ARGUMENT</code>.
If a <em class="parameter"><code>signature</code></em> is provided but the JSON structure cannot be mapped to it,
<code class="literal">NULL</code> is returned and error is set to <code class="literal">G_IO_ERROR_INVALID_DATA</code>.
If <em class="parameter"><code>signature</code></em> is <code class="literal">NULL</code>, the conversion is done based strictly on the types
in the JSON nodes.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>json_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> to convert</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>signature</code></em> :</span></p></td>
<td>A valid <span class="type">GVariant</span> type string, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A pointer to a <span class="type">GError</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created <span class="type">GVariant</span> compliant with
<em class="parameter"><code>signature</code></em>, or <code class="literal">NULL</code> on error. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="json-gvariant-deserialize-data"></a><h3>json_gvariant_deserialize_data ()</h3>
<pre class="programlisting"><span class="returnvalue">GVariant</span> *          json_gvariant_deserialize_data      (<em class="parameter"><code>const <span class="type">gchar</span> *json</code></em>,
                                                         <em class="parameter"><code><span class="type">gssize</span> length</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *signature</code></em>,
                                                         <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
Converts a JSON string to a <span class="type">GVariant</span> value. This method works exactly
like <a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize" title="json_gvariant_deserialize ()"><code class="function">json_gvariant_deserialize()</code></a>, but takes a JSON encoded string instead.
The string is first converted to a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> using <a class="link" href="JsonParser.html" title="JsonParser"><span class="type">JsonParser</span></a>, and then
<a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize" title="json_gvariant_deserialize ()"><code class="function">json_gvariant_deserialize()</code></a> is called.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>json</code></em> :</span></p></td>
<td>A JSON data string</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>The length of <em class="parameter"><code>json</code></em>, or -1 if <code class="literal">NULL</code>-terminated</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>signature</code></em> :</span></p></td>
<td>A valid <span class="type">GVariant</span> type string, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A pointer to a <span class="type">GError</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created <span class="type">GVariant</span> compliant with
<em class="parameter"><code>signature</code></em>, or <code class="literal">NULL</code> on error. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
</div>
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