 is set to indicate the error.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="ERRORS"><a class="permalink" href="#ERRORS">ERRORS</a></h1>
<p class="Pp"><code class="Fn">zip_file_extra_field_get</code>() and
    <code class="Fn">zip_file_extra_field_get_by_id</code>() fail if:</p>
<dl class="Bl-tag">
  <dt id="ZIP_ER_NOENT">[<a class="permalink" href="#ZIP_ER_NOENT"><code class="Er">ZIP_ER_NOENT</code></a>]</dt>
  <dd><var class="Ar">index</var> is not a valid file index in
      <var class="Ar">arch