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

AbandonFrozen	CThostFtdcInvestorPositionField
BrokerID	CThostFtdcInvestorPositionField
CashIn	CThostFtdcInvestorPositionField
CloseAmount	CThostFtdcInvestorPositionField
CloseProfit	CThostFtdcInvestorPositionField
CloseProfitByDate	CThostFtdcInvestorPositionField
CloseProfitByTrade	CThostFtdcInvestorPositionField
CloseVolume	CThostFtdcInvestorPositionField
CombLongFrozen	CThostFtdcInvestorPositionField
CombPosition	CThostFtdcInvestorPositionField
CombShortFrozen	CThostFtdcInvestorPositionField
Commission	CThostFtdcInvestorPositionField
ExchangeMargin	CThostFtdcInvestorPositionField
FrozenCash	CThostFtdcInvestorPositionField
FrozenCommission	CThostFtdcInvestorPositionField
FrozenMargin	CThostFtdcInvestorPositionField
HedgeFlag	CThostFtdcInvestorPositionField
InstrumentID	CThostFtdcInvestorPositionField
InvestorID	CThostFtdcInvestorPositionField
LongFrozen	CThostFtdcInvestorPositionField
LongFrozenAmount	CThostFtdcInvestorPositionField
MarginRateByMoney	CThostFtdcInvestorPositionField
MarginRateByVolume	CThostFtdcInvestorPositionField
OpenAmount	CThostFtdcInvestorPositionField
OpenCost	CThostFtdcInvestorPositionField
OpenVolume	CThostFtdcInvestorPositionField
PosiDirection	CThostFtdcInvestorPositionField
Position	CThostFtdcInvestorPositionField
PositionCost	CThostFtdcInvestorPositionField
PositionDate	CThostFtdcInvestorPositionField
PositionProfit	CThostFtdcInvestorPositionField
PreMargin	CThostFtdcInvestorPositionField
PreSettlementPrice	CThostFtdcInvestorPositionField
SettlementID	CThostFtdcInvestorPositionField
SettlementPrice	CThostFtdcInvestorPositionField
ShortFrozen	CThostFtdcInvestorPositionField
ShortFrozenAmount	CThostFtdcInvestorPositionField
StrikeFrozen	CThostFtdcInvestorPositionField
StrikeFrozenAmount	CThostFtdcInvestorPositionField
TodayPosition	CThostFtdcInvestorPositionField
TradingDay	CThostFtdcInvestorPositionField
UseMargin	CThostFtdcInvestorPositionField
YdPosition	CThostFtdcInvestorPositionField