| Current File : //proc/self/root/kunden/usr/share/gtk-doc/html/libsecret-1/c-lookup-example.html |
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>C example: Lookup a password: Libsecret Library Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot">
<link rel="home" href="index.html" title="Libsecret Library Reference Manual">
<link rel="up" href="c-examples.html" title="C examples">
<link rel="prev" href="c-store-example.html" title="C example: Store a password">
<link rel="next" href="c-remove-example.html" title="C example: Remove a password">
<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="c-examples.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="c-store-example.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="c-remove-example.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="c-lookup-example"></a>C example: Lookup a password</h2></div></div></div>
<p>Here's how to lookup a password in the running secret service,
like gnome-keyring or ksecretservice.</p>
<p>Each stored password has a set of attributes which are
used to lookup the password. If multiple passwords match the
lookup attributes, then the one stored most recently is returned.</p>
<p>These examples use <a class="link" href="c-examples.html#c-schema-example" title="C example: Define a password schema">the example
schema</a>.</p>
<p>This first example looks up a password asynchronously, and is
appropriate for GUI applications so that the UI does not block.</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="k">static</span> <span class="kt">void</span>
<span class="nf">on_password_lookup</span> <span class="p">(</span><span class="n">GObject</span> <span class="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="n">GAsyncResult</span> <span class="o">*</span><span class="n">result</span><span class="p">,</span>
<span class="n">gpointer</span> <span class="n">unused</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">GError</span> <span class="o">*</span><span class="n">error</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span>
<span class="n">gchar</span> <span class="o">*</span><span class="n">password</span> <span class="o">=</span> <span class="n">secret_password_lookup_finish</span> <span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="o">&</span><span class="n">error</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">error</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span>
<span class="cm">/* ... handle the failure here */</span>
<span class="n">g_error_free</span> <span class="p">(</span><span class="n">error</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">password</span> <span class="o">==</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span>
<span class="cm">/* password will be null, if no matching password found */</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="cm">/* ... do something with the password */</span>
<span class="n">secret_password_free</span> <span class="p">(</span><span class="n">password</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="cm">/*</span>
<span class="cm"> * The variable argument list is the attributes used to later</span>
<span class="cm"> * lookup the password. These attributes must conform to the schema.</span>
<span class="cm"> */</span>
<span class="n">secret_password_lookup</span> <span class="p">(</span><span class="n">EXAMPLE_SCHEMA</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="n">on_password_lookup</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span>
<span class="s">"string"</span><span class="p">,</span> <span class="s">"nine"</span><span class="p">,</span>
<span class="s">"even"</span><span class="p">,</span> <span class="n">FALSE</span><span class="p">,</span>
<span class="nb">NULL</span><span class="p">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>This next example looks up a password synchronously. The function
call will block until the lookup completes. So this is appropriate for
non GUI applications.</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">GError</span> <span class="o">*</span><span class="n">error</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span>
<span class="cm">/* The attributes used to lookup the password should conform to the schema. */</span>
<span class="n">gchar</span> <span class="o">*</span><span class="n">password</span> <span class="o">=</span> <span class="n">secret_password_lookup_sync</span> <span class="p">(</span><span class="n">EXAMPLE_SCHEMA</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="o">&</span><span class="n">error</span><span class="p">,</span>
<span class="s">"string"</span><span class="p">,</span> <span class="s">"nine"</span><span class="p">,</span>
<span class="s">"even"</span><span class="p">,</span> <span class="n">FALSE</span><span class="p">,</span>
<span class="nb">NULL</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">error</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span>
<span class="cm">/* ... handle the failure here */</span>
<span class="n">g_error_free</span> <span class="p">(</span><span class="n">error</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">password</span> <span class="o">==</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span>
<span class="cm">/* password will be null, if no matching password found */</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="cm">/* ... do something with the password */</span>
<span class="n">secret_password_free</span> <span class="p">(</span><span class="n">password</span><span class="p">);</span>
<span class="p">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="footer">
<hr>Generated by GTK-Doc V1.32</div>
</body>
</html>