count</td><td>the memory location where the library will store the number of keys returned.</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>a <a class="el" href="group__micro_types.html#ga41ae4121cf2f8e326369bbc2e44e20d7" title="the Microservice error object.">microError</a> if an error occurred.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__msg_group.html#ga6ee8a007111ada293dd24ff0bab02491" title="Get all header keys.">natsMsgHeader_Keys