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

BrokerID	CThostFtdcInvestorPositionCombineDetailField
CombInstrumentID	CThostFtdcInvestorPositionCombineDetailField
ComTradeID	CThostFtdcInvestorPositionCombineDetailField
Direction	CThostFtdcInvestorPositionCombineDetailField
ExchangeID	CThostFtdcInvestorPositionCombineDetailField
ExchMargin	CThostFtdcInvestorPositionCombineDetailField
HedgeFlag	CThostFtdcInvestorPositionCombineDetailField
InstrumentID	CThostFtdcInvestorPositionCombineDetailField
InvestorID	CThostFtdcInvestorPositionCombineDetailField
LegID	CThostFtdcInvestorPositionCombineDetailField
LegMultiple	CThostFtdcInvestorPositionCombineDetailField
Margin	CThostFtdcInvestorPositionCombineDetailField
MarginRateByMoney	CThostFtdcInvestorPositionCombineDetailField
MarginRateByVolume	CThostFtdcInvestorPositionCombineDetailField
OpenDate	CThostFtdcInvestorPositionCombineDetailField
SettlementID	CThostFtdcInvestorPositionCombineDetailField
TotalAmt	CThostFtdcInvestorPositionCombineDetailField
TradeGroupID	CThostFtdcInvestorPositionCombineDetailField
TradeID	CThostFtdcInvestorPositionCombineDetailField
TradingDay	CThostFtdcInvestorPositionCombineDetailField