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

BrokerID	CThostFtdcInvestorProductGroupMarginField
CashIn	CThostFtdcInvestorProductGroupMarginField
CloseProfit	CThostFtdcInvestorProductGroupMarginField
Commission	CThostFtdcInvestorProductGroupMarginField
ExchMargin	CThostFtdcInvestorProductGroupMarginField
ExchOffsetAmount	CThostFtdcInvestorProductGroupMarginField
FrozenCash	CThostFtdcInvestorProductGroupMarginField
FrozenCommission	CThostFtdcInvestorProductGroupMarginField
FrozenMargin	CThostFtdcInvestorProductGroupMarginField
HedgeFlag	CThostFtdcInvestorProductGroupMarginField
InvestorID	CThostFtdcInvestorProductGroupMarginField
LongExchMargin	CThostFtdcInvestorProductGroupMarginField
LongExchOffsetAmount	CThostFtdcInvestorProductGroupMarginField
LongFrozenMargin	CThostFtdcInvestorProductGroupMarginField
LongOffsetAmount	CThostFtdcInvestorProductGroupMarginField
LongUseMargin	CThostFtdcInvestorProductGroupMarginField
OffsetAmount	CThostFtdcInvestorProductGroupMarginField
PositionProfit	CThostFtdcInvestorProductGroupMarginField
ProductGroupID	CThostFtdcInvestorProductGroupMarginField
SettlementID	CThostFtdcInvestorProductGroupMarginField
ShortExchMargin	CThostFtdcInvestorProductGroupMarginField
ShortExchOffsetAmount	CThostFtdcInvestorProductGroupMarginField
ShortFrozenMargin	CThostFtdcInvestorProductGroupMarginField
ShortOffsetAmount	CThostFtdcInvestorProductGroupMarginField
ShortUseMargin	CThostFtdcInvestorProductGroupMarginField
TradingDay	CThostFtdcInvestorProductGroupMarginField
UseMargin	CThostFtdcInvestorProductGroupMarginField