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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>User data: HarfBuzz Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="HarfBuzz Manual"> <link rel="up" href="object-model.html" title="The HarfBuzz object model"> <link rel="prev" href="object-model-lifecycle.html" title="Object lifecycle management"> <link rel="next" href="object-model-blobs.html" title="Blobs"> <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"></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="object-model.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="object-model-lifecycle.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="object-model-blobs.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="object-model-user-data"></a>User data</h2></div></div></div> <p> To better integrate with client programs, HarfBuzz's objects offer a "user data" mechanism that can be used to attach arbitrary data to the object. User-data attachment can be useful for tying the lifecycles of various pieces of data together, or for creating language bindings. </p> <p> Each object type has a <code class="function">set_user_data()</code> method and a <code class="function">get_user_data()</code> method. The <code class="function">set_user_data()</code> methods take a client-provided <code class="literal">key</code> and a pointer, <code class="literal">user_data</code>, pointing to the data itself. Once the key-data pair has been attached to the object, the <code class="function">get_user_data()</code> method can be called with the key, returning the <code class="function">user_data</code> pointer. </p> <p> The <code class="function">set_user_data()</code> methods also support an optional <code class="function">destroy</code> callback. Client programs can set the <code class="function">destroy</code> callback and receive notification from HarfBuzz whenever the object is destructed. </p> <p> Finally, each <code class="function">set_user_data()</code> method allows the client program to set a <code class="literal">replace</code> Boolean indicating whether or not the function call should replace any existing <code class="literal">user_data</code> associated with the specified key. </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>