Your are declearing "double_cdecl" in header file
and not defining him or calling him in the .cpp file.
just do like
void double_cdecl ()
$doc = new DOMDocument();
$doc->load( 'readonly.xml' );
$user = $doc->getElementsByTagName("user");...
Ok so i have everything, but nothing works.
the respone receiver:
class LLAuthorize : public LLHTTPClient::Responder
Separate names with a comma.