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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>JSON-GLib Reference Manual: JSON GVariant Integration</title>
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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 class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="json-glib-JSON-GVariant-Integration.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">
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="returnvalue">JsonNode</span></a> *
</td>
<td class="function_name">
<a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-serialize" title="json_gvariant_serialize ()">json_gvariant_serialize</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-serialize-data" title="json_gvariant_serialize_data ()">json_gvariant_serialize_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GVariant</span> *
</td>
<td class="function_name">
<a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize" title="json_gvariant_deserialize ()">json_gvariant_deserialize</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GVariant</span> *
</td>
<td class="function_name">
<a class="link" href="json-glib-JSON-GVariant-Integration.html#json-gvariant-deserialize-data" title="json_gvariant_deserialize_data ()">json_gvariant_deserialize_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="json-glib-JSON-GVariant-Integration.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</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.</p>
<p>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
using the following rules:</p>
<div class="refsect3">
<a name="id-1.5.5.5.5"></a><h4>Strings</h4>
<p>JSON strings map to GVariant <code class="literal">(s)</code>.</p>
</div>
<div class="refsect3">
<a name="id-1.5.5.5.6"></a><h4>Integers</h4>
<p>JSON integers map to GVariant int64 <code class="literal">(x)</code>.</p>
</div>
<div class="refsect3">
<a name="id-1.5.5.5.7"></a><h4>Booleans</h4>
<p>JSON booleans map to GVariant boolean <code class="literal">(b)</code>.</p>
</div>
<div class="refsect3">
<a name="id-1.5.5.5.8"></a><h4>Numbers</h4>
<p>JSON numbers map to GVariant double <code class="literal">(d)</code>.</p>
</div>
<div class="refsect3">
<a name="id-1.5.5.5.9"></a><h4>Arrays</h4>
<p>JSON arrays map to GVariant arrays of variants <code class="literal">(av)</code>.</p>
</div>
<div class="refsect3">
<a name="id-1.5.5.5.10"></a><h4>Objects</h4>
<p>JSON objects map to GVariant dictionaries of string to variants <code class="literal">(a{sv})</code>.</p>
</div>
<div class="refsect3">
<a name="id-1.5.5.5.11"></a><h4>Null values</h4>
<p>JSON null values map to GVariant maybe variants <code class="literal">(mv)</code>.</p>
</div>
</div>
<div class="refsect1">
<a name="json-glib-JSON-GVariant-Integration.functions_details"></a><h2>Functions</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="refsect3">
<a name="id-1.5.5.6.2.5"></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>variant</p></td>
<td class="parameter_description"><p>A <span class="type">GVariant</span> to convert</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.5.6.2.6"></a><h4>Returns</h4>
<p> 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>
. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</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="refsect3">
<a name="id-1.5.5.6.3.5"></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>variant</p></td>
<td class="parameter_description"><p>A <span class="type">GVariant</span> to convert</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p> Return location for the length of the returned
string, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><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>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.5.6.3.6"></a><h4>Returns</h4>
<p> The JSON encoded string corresponding to
<em class="parameter"><code>variant</code></em>
. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</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>
<p>The returned variant has a floating reference that will need to be sunk
by the caller code.</p>
<div class="refsect3">
<a name="id-1.5.5.6.4.7"></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>json_node</p></td>
<td class="parameter_description"><p>A <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> to convert</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>signature</p></td>
<td class="parameter_description"><p> A valid <span class="type">GVariant</span> type string, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><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 class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">GError</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.5.6.4.8"></a><h4>Returns</h4>
<p> A newly created, floating <span class="type">GVariant</span>
compliant with <em class="parameter"><code>signature</code></em>
, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</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>
<p>The returned variant has a floating reference that will need to be sunk
by the caller code.</p>
<div class="refsect3">
<a name="id-1.5.5.6.5.6"></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>json</p></td>
<td class="parameter_description"><p>A JSON data string</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>The length of <em class="parameter"><code>json</code></em>
, or -1 if <code class="literal">NULL</code>-terminated</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>signature</p></td>
<td class="parameter_description"><p> A valid <span class="type">GVariant</span> type string, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><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 class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>A pointer to a <span class="type">GError</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.5.6.5.7"></a><h4>Returns</h4>
<p> A newly created, floating <span class="type">GVariant</span> compliant
with <em class="parameter"><code>signature</code></em>
, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since 0.14</p>
</div>
</div>
<div class="refsect1">
<a name="json-glib-JSON-GVariant-Integration.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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