void ReqQueryInvestorOpenCombinePosition()
{
ThostFtdcQryInvestorPositionCombineDetailField req = new ThostFtdcQryInvestorPositionCombineDetailField();
req.BrokerID = BROKER_ID;
req.InvestorID = INVESTOR_ID;
int iResult = api.ReqQueryInvestorOpenCombinePosition(req, ++iRequestID);
Console.WriteLine("--->>> 请求查询开盘前组合持仓: " + ((iResult == 0) ? "成功" : "失败"));
}