struct JNetConfig
{
    enum TransmissionProtocol
    {
//        UserDefinedProto,/**< Specifies a user defined protocol. */
        TCPProto=1,        /**< Specifies the internal RAW TCP protocol. */
        UDPProto,        /**< Specifies the internal RAW UDP protocol. */
        RTPProto,        /**< Specifies the internal RTP/RTCP protocol. */
    };
}

= JNetConfig::TransmissionProtocol(type & 0xFFFF);//这句是调用