Question

我希望通过C＃从Bloomberg .Net API 3获得实时价格快照。

我可以从示例中看到如何获取历史价格或订阅数据，但我找不到获得订单簿快照的正确请求，即买/卖/最后交易价格和数量。

对于盘中价格，我会做这样的事情：

Service refDataService = d_session.GetService("//blp/refdata");
// create intraday tick request
Request request = refDataService.CreateRequest("IntradayTickRequest");
// set request parameters
request.Set("includeConditionCodes", checkBoxIncludeConditionCode.Checked);
request.Set("includeExchangeCodes", checkBoxIncludeExchangeCode.Checked);
Element eventTypes = request.GetElement("eventTypes");
eventTypes.AppendValue("TRADE");
eventTypes.AppendValue("BID");
eventTypes.AppendValue("ASK");
request.Set("security", d_requestSecurity);
request.Set("startDateTime", new BDateTime(startDate.Year, startDate.Month,
             startDate.Day,startDate.Hour, startDate.Minute, startDate.Second, 0));
request.Set("endDateTime", new BDateTime(endDate.Year, endDate.Month, endDate.Day,
             endDate.Hour, endDate.Minute, endDate.Second, 0));

是否有不同的实时快照请求？

Answer 1

最低限度地改编自API附带的示例：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Bloomberglp.Blpapi;

namespace BbServerApiTool
{
    public class GetFields : GetBloombergFields
    {
        private static readonly Name EXCEPTIONS = new Name("exceptions");
        private static readonly Name FIELD_ID = new Name("fieldId");
        private static readonly Name REASON = new Name("reason");
        private static readonly Name CATEGORY = new Name("category");
        private static readonly Name DESCRIPTION = new Name("description");
        private static readonly Name ERROR_CODE = new Name("errorCode");
        private static readonly Name SOURCE = new Name("source");
        private static readonly Name SECURITY_ERROR = new Name("securityError");
        private static readonly Name MESSAGE = new Name("message");
        private static readonly Name RESPONSE_ERROR = new Name("responseError");
        private static readonly Name SECURITY_DATA = new Name("securityData");
        private static readonly Name FIELD_EXCEPTIONS = new Name("fieldExceptions");
        private static readonly Name ERROR_INFO = new Name("errorInfo");

        public override List<List<string>> GetBbFields(string[] tickers, string[] fieldsParam)
        {
            string serverHost = System.Configuration.ConfigurationManager.AppSettings["Host"];
            int serverPort = Int32.Parse(System.Configuration.ConfigurationManager.AppSettings["Port"]);

            var sessionOptions = new SessionOptions {ServerHost = serverHost, ServerPort = serverPort};

            var session = new Session(sessionOptions);
            session.Start();
            session.OpenService("//blp/refdata");
            Service refDataService = session.GetService("//blp/refdata");
            Request request = refDataService.CreateRequest("ReferenceDataRequest");
            Element securities = request.GetElement("securities");
            Element fields = request.GetElement("fields");
            request.Set("returnEids", true);

            foreach (var ticker in tickers)
            {
                securities.AppendValue(ticker);
            }

            foreach (var field in fieldsParam)
            {
                fields.AppendValue(field);
            }

            var cID = new CorrelationID(1);
            session.Cancel(cID);
            Results = new List<List<string>>();
            session.SendRequest(request, cID);

            while (true)
            {
                Event eventObj = session.NextEvent();
                processEvent(eventObj, session, fieldsParam);
                if (eventObj.Type == Event.EventType.RESPONSE)
                {
                    return Results;   
                }
            }
        }

        protected override string GetName()
        {
            return "BbServerApiTool";
        }

        private void processEvent(Event eventObj, Session session, string[] fields)
        {
            switch (eventObj.Type)
            {
                case Event.EventType.RESPONSE:
                case Event.EventType.PARTIAL_RESPONSE:
                    processRequestDataEvent(eventObj, session, fields);
                    break;
                default:
                    processMiscEvents(eventObj, session);
                    break;
            }
        }

        private void processMiscEvents(Event eventObj, Session session)
        {
            foreach (Message msg in eventObj.GetMessages())
            {
                switch (msg.MessageType.ToString())
                {
                    case "RequestFailure":
                        Element reason = msg.GetElement(REASON);
                        string message = string.Concat("Error: Source-", reason.GetElementAsString(SOURCE),
                            ", Code-", reason.GetElementAsString(ERROR_CODE), ", category-", reason.GetElementAsString(CATEGORY),
                            ", desc-", reason.GetElementAsString(DESCRIPTION));
                        throw new ArgumentException(message);
                    case "SessionStarted":
                    case "SessionTerminated":
                    case "SessionStopped":
                    case "ServiceOpened":
                    default:
                        break;
                }
            }
        }
        private void processRequestDataEvent(Event eventObj, Session session, string[] fields)
        {
            foreach (Message msg in eventObj.GetMessages())
            {
                if (msg.MessageType.Equals(Name.GetName("ReferenceDataResponse")))
                {
                    Element secDataArray = msg.GetElement(SECURITY_DATA);
                    int numberOfSecurities = secDataArray.NumValues;
                    for (int index = 0; index < numberOfSecurities; index++)
                    {
                        Element secData = secDataArray.GetValueAsElement(index);
                        Element fieldData = secData.GetElement("fieldData");

                        if (secData.HasElement(FIELD_EXCEPTIONS))
                        {
                            // process error
                            Element error = secData.GetElement(FIELD_EXCEPTIONS);
                            if (error.Elements.Count() > 0)
                            {
                                Element errorException = error.GetValueAsElement(0);
                                Element errorInfo = errorException.GetElement(ERROR_INFO);
                                string message = errorInfo.GetElementAsString(MESSAGE);
                                throw new ArgumentException(message);
                            }
                        }

                        var list = new List<string> { secData.GetElement("security").GetValueAsString() };
                        if (secData.HasElement(SECURITY_ERROR))
                        {
                            Element error = secData.GetElement(SECURITY_ERROR);
                            string errorMessage = error.GetElementAsString(MESSAGE);
                            //                            throw new ArgumentException(errorMessage);
                            //TODO Log
                            logger.WriteLine("Couldn't get a value for " + secData.GetElement("security").GetValueAsString());
                            foreach (var field in fields)
                            {
                                list.Add("N/A");
                            }
                        }
                        else
                        {
                            foreach (var field in fields)
                            {
                                Element item = fieldData.GetElement(field);
                                list.Add(item.IsNull ? "N/A" : item.GetValueAsString());
                            }
                        }
                        Results.Add(list);
                    }
                }
            }
        }
    }
}

Answer 2

如果您想确保绝对实时定价，您可能会使用订阅服务api（// blp / mktdata），它也会返回价格，并标明最后交易标记的确切时间。

在开发人员指南中有一个很好的例子，可以通过附录C.2（订阅范例）中的彭博终端获得。

Answer 3

似乎没有特定的Bloomberg请求订单簿的“实时快照”。其他方法显然在示例中有记录，但看起来Bloomberg并没有在他们的.Net API中给出这一点。

有一些参考数据请求似乎最接近快照类型的查询，但没有关于更新这些变量的延迟的文档。 “参考”这个名称并没有激发人们对听起来像实时请求的信心。

订阅是快照类型请求的替代方法，在许多应用程序中都是优越的。通过订阅，订单簿的更新将实时流式传输到您的套接字。这种方法的缺点是您需要内部架构来支持它，而且您可能需要等待一段不确定的时间来查看某些市场中的任何活动。

考虑到这一点，我认为试错法最好，与其他数据提供商合作可能会更有成效。

Answer 4

如果你需要获得实时价格而不是静态价格，你仍然可以通过ReferenceDataRequest来实现。使用哪个字段的唯一区别。 PX_LAST为您提供按参考数据每月限额计算的最后价格。 LAST_PRICE为您提供实时数据每月限额的实时最后价格。

PS：我从彭博销售代表那里得到了这些信息。

如何在bloomberg获得实时价格快照？

4 个答案: