class="desc">
<p>The value matching the above key, if it exists.</p>
</td></tr>
</table>

<h4>return</h4>
<p>The amount of memory (in bytes) required to hold the requested value (if it exists, -1 otherwise).</p>

<h4>note</h4>
<p>The values returned are not pointers into the internal structures of the face, but are &lsquo;fresh&rsquo; copies, so that the memory containing them belongs to the calling application. This also enforces the &lsquo;read-only&rsquo; nature of these values, i.e., this function canno