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

BrokerID	CThostFtdcInvestorPositionDetailField
CloseAmount	CThostFtdcInvestorPositionDetailField
CloseProfitByDate	CThostFtdcInvestorPositionDetailField
CloseProfitByTrade	CThostFtdcInvestorPositionDetailField
CloseVolume	CThostFtdcInvestorPositionDetailField
CombInstrumentID	CThostFtdcInvestorPositionDetailField
Direction	CThostFtdcInvestorPositionDetailField
ExchangeID	CThostFtdcInvestorPositionDetailField
ExchMargin	CThostFtdcInvestorPositionDetailField
HedgeFlag	CThostFtdcInvestorPositionDetailField
InstrumentID	CThostFtdcInvestorPositionDetailField
InvestorID	CThostFtdcInvestorPositionDetailField
LastSettlementPrice	CThostFtdcInvestorPositionDetailField
Margin	CThostFtdcInvestorPositionDetailField
MarginRateByMoney	CThostFtdcInvestorPositionDetailField
MarginRateByVolume	CThostFtdcInvestorPositionDetailField
OpenDate	CThostFtdcInvestorPositionDetailField
OpenPrice	CThostFtdcInvestorPositionDetailField
PositionProfitByDate	CThostFtdcInvestorPositionDetailField
PositionProfitByTrade	CThostFtdcInvestorPositionDetailField
SettlementID	CThostFtdcInvestorPositionDetailField
SettlementPrice	CThostFtdcInvestorPositionDetailField
TradeID	CThostFtdcInvestorPositionDetailField
TradeType	CThostFtdcInvestorPositionDetailField
TradingDay	CThostFtdcInvestorPositionDetailField
Volume	CThostFtdcInvestorPositionDetailField