成员的完整列表，这些成员属于 CThostFtdcUserSessionField,包括所有继承而来的类成员

BrokerID	CThostFtdcUserSessionField
FrontID	CThostFtdcUserSessionField
InterfaceProductInfo	CThostFtdcUserSessionField
IPAddress	CThostFtdcUserSessionField
LoginDate	CThostFtdcUserSessionField
LoginRemark	CThostFtdcUserSessionField
LoginTime	CThostFtdcUserSessionField
MacAddress	CThostFtdcUserSessionField
ProtocolInfo	CThostFtdcUserSessionField
SessionID	CThostFtdcUserSessionField
UserID	CThostFtdcUserSessionField
UserProductInfo	CThostFtdcUserSessionField