[CCode (cname = "vaQueryConfigProfiles")]
        public Status _query_config_profiles([CCode (array_length="false")] Profile[] profiles, ref int num_profiles);
        public Status query_config_profiles(ref Profile[] profiles) {
            var len = profiles.length;
            var status = _query_config_profiles(profiles, ref len);
            profiles.length = len;
            return status;
        }