//建立行情
        private void Connect_MD()
        {
            lock (_lockMd)
            {
                if (_bWantMdConnect &&
                    (null == m_pMdApi || IntPtr.Zero == m_pMdApi))
                {
                    m_pMdApi = MdApi.MD_CreateMdApi();
                    MdApi.CTP_RegOnRtnDepthMarketData(m_pMsgQueue, _fnOnRtnDepthMarketData_Holder);
                    MdApi.MD_RegMsgQueue2MdApi(m_pMdApi, m_pMsgQueue);
                    MdApi.MD_Connect(m_pMdApi, _newTempPath, string.Join(";", server.MarketData.ToArray()), server.BrokerID, account.InvestorId, account.Password);

                    //向单例对象中注入操作用句柄
                    CTPAPI.GetInstance().__RegMdApi(m_pMdApi);
                }
            }
        }