CMdSpi继承CThostFtdcMdSpi class CMdSpi : public CThostFtdcMdSpi void CMdSpi::OnRtnDepthMarketData(CThostFtdcDepthMarketDataField *pDepthMarketData) { cerr << "深度行情回报"<< endl; //VC6不支持__FUNCTION__ } Q:在虚拟函数OnRtnDepthMarketData并没有添加行情数据的命令行输出操作,为什么命令行中会有数据输出? FIELD [CFTDDepthMarketDataField] START .. .. .. FIELD [CFTDDepthMarketDataField] END