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<title>C example: Lookup a password: Libsecret Library Reference Manual</title>
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<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">
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<td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">on_password_lookup</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GObject</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">source</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GAsyncResult</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">result</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> unused</span><span class="symbol">)</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="usertype">GError</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">error </span><span class="symbol">=</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">;</span>
<span class="normal"> </span><span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">password </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="libsecret-Password-storage.html#secret-password-lookup-finish">secret_password_lookup_finish</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">result</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">error</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">error </span><span class="symbol">!=</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="comment">/* ... handle the failure here */</span>
<span class="normal"> </span><span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#g-error-free">g_error_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">error</span><span class="symbol">);</span>
<span class="normal"> </span><span class="cbracket">}</span><span class="normal"> </span><span class="keyword">else</span><span class="normal"> </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">password </span><span class="symbol">==</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="comment">/* password will be null, if no matching password found */</span>
<span class="normal"> </span><span class="cbracket">}</span><span class="normal"> </span><span class="keyword">else</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="comment">/* ... do something with the password */</span>
<span class="normal"> </span><span class="function"><a href="libsecret-Password-storage.html#secret-password-free">secret_password_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">password</span><span class="symbol">);</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="cbracket">}</span>
<span class="comment">/*</span>
<span class="comment"> * The variable argument list is the attributes used to later</span>
<span class="comment"> * lookup the password. These attributes must conform to the schema.</span>
<span class="comment"> */</span>
<span class="function"><a href="libsecret-Password-storage.html#secret-password-lookup">secret_password_lookup</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">EXAMPLE_SCHEMA</span><span class="symbol">,</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> on_password_lookup</span><span class="symbol">,</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"string"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"nine"</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"even"</span><span class="symbol">,</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">,</span>
<span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span></pre></td>
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</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>
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<td class="listing_lines" align="right"><pre>1
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<td class="listing_code"><pre class="programlisting"><span class="usertype">GError</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">error </span><span class="symbol">=</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">;</span>
<span class="comment">/* The attributes used to lookup the password should conform to the schema. */</span>
<span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">password </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="libsecret-Password-storage.html#secret-password-lookup-sync">secret_password_lookup_sync</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">EXAMPLE_SCHEMA</span><span class="symbol">,</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">error</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"string"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"nine"</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"even"</span><span class="symbol">,</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">,</span>
<span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">error </span><span class="symbol">!=</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="comment">/* ... handle the failure here */</span>
<span class="normal"> </span><span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#g-error-free">g_error_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">error</span><span class="symbol">);</span>
<span class="cbracket">}</span><span class="normal"> </span><span class="keyword">else</span><span class="normal"> </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">password </span><span class="symbol">==</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="comment">/* password will be null, if no matching password found */</span>
<span class="cbracket">}</span><span class="normal"> </span><span class="keyword">else</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="comment">/* ... do something with the password */</span>
<span class="normal"> </span><span class="function"><a href="libsecret-Password-storage.html#secret-password-free">secret_password_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">password</span><span class="symbol">);</span>
<span class="cbracket">}</span></pre></td>
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