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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>GUuid: GLib Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GLib Reference Manual"> <link rel="up" href="glib-utilities.html" title="GLib Utilities"> <link rel="prev" href="glib-Windows-Compatibility-Functions.html" title="Windows Compatibility Functions"> <link rel="next" href="glib-data-types.html" title="GLib Data Types"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><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="#glib-GUuid.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="glib-utilities.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="glib-Windows-Compatibility-Functions.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="glib-data-types.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="glib-GUuid"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="glib-GUuid.top_of_page"></a>GUuid</span></h2> <p>GUuid — a universally unique identifier</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="glib-GUuid.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GUuid.html#g-uuid-string-is-valid" title="g_uuid_string_is_valid ()">g_uuid_string_is_valid</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GUuid.html#g-uuid-string-random" title="g_uuid_string_random ()">g_uuid_string_random</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-GUuid.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <glib.h> #include <glib/gi18n.h> </pre> </div> <div class="refsect1"> <a name="glib-GUuid.description"></a><h2>Description</h2> <p>A UUID, or Universally unique identifier, is intended to uniquely identify information in a distributed environment. For the definition of UUID, see <a class="ulink" href="https://tools.ietf.org/html/rfc4122.html" target="_top">RFC 4122</a>.</p> <p>The creation of UUIDs does not require a centralized authority.</p> <p>UUIDs are of relatively small size (128 bits, or 16 bytes). The common string representation (ex: 1d6c0810-2bd6-45f3-9890-0268422a6f14) needs 37 bytes.</p> <p>The UUID specification defines 5 versions, and calling <a class="link" href="glib-GUuid.html#g-uuid-string-random" title="g_uuid_string_random ()"><code class="function">g_uuid_string_random()</code></a> will generate a unique (or rather random) UUID of the most common version, version 4.</p> </div> <div class="refsect1"> <a name="glib-GUuid.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-uuid-string-is-valid"></a><h3>g_uuid_string_is_valid ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_uuid_string_is_valid (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *str</code></em>);</pre> <p>Parses the string <em class="parameter"><code>str</code></em> and verify if it is a UUID.</p> <p>The function accepts the following syntax:</p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>simple forms (e.g. <code class="literal">f81d4fae-7dec-11d0-a765-00a0c91e6bf6</code>)</p></li></ul></div> <p>Note that hyphens are required within the UUID string itself, as per the aforementioned RFC.</p> <div class="refsect3"> <a name="g-uuid-string-is-valid.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" 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>str</p></td> <td class="parameter_description"><p>a string representing a UUID</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-uuid-string-is-valid.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>str</code></em> is a valid UUID, <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> otherwise.</p> </div> <p class="since">Since: <a class="link" href="api-index-2-52.html#api-index-2.52">2.52</a></p> </div> <hr> <div class="refsect2"> <a name="g-uuid-string-random"></a><h3>g_uuid_string_random ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_uuid_string_random (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> <p>Generates a random UUID (RFC 4122 version 4) as a string. It has the same randomness guarantees as <a class="link" href="glib-Random-Numbers.html#GRand" title="GRand"><span class="type">GRand</span></a>, so must not be used for cryptographic purposes such as key generation, nonces, salts or one-time pads.</p> <div class="refsect3"> <a name="g-uuid-string-random.returns"></a><h4>Returns</h4> <p>A string that should be freed with <a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a>. </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: <a class="link" href="api-index-2-52.html#api-index-2.52">2.52</a></p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>