小妹急求客户端自动更新的断点续传叔叔们求帮助啦！！

Question

以前公司有个客户端当服务器更新版本的时候客户端也需要更新，可是人家客户网速不给了哦！老是下载更新文件下了一部分网速不行就失败了，同事哥哥说要用断点续传哦神马东东哦！

Answer 1

服务端程序/// <summary>
        /// 客户端升级前先获取服务器版本号
        /// </summary>
        /// <returns></returns>
        [WebMethod(Description = "取得更新版本")]        public string GetVer()
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(Server.MapPath("update.xml"));
            XmlElement root = doc.DocumentElement;
            return root.SelectSingleNode("version").InnerText;
        }
        
        
        /// <summary>
        /// 获取更新软件路径及详细信息
        /// </summary>
        /// <returns></returns>
        [WebMethod(Description = "在线更新软件")]
        public string GetUpdateData()
        {
            //取得更新的xml模板内容
            XmlDocument doc = new XmlDocument();
            doc.Load(Server.MapPath("update.xml"));
            XmlElement root = doc.DocumentElement;
            
            //看看有几个文件需要更新
            XmlNode updateNode = root.SelectSingleNode("filelist");
            string path = updateNode.Attributes["sourcepath"].Value;
            int count = int.Parse(updateNode.Attributes["count"].Value);
            
            //将xml中的value用实际内容替换
            for (int i = 0; i < count; i++)
            {
                XmlNode itemNode = updateNode.ChildNodes[i];
                string fileName = path + itemNode.Attributes["name"].Value;
                FileStream fs = File.OpenRead(Server.MapPath(fileName));
                itemNode.Attributes["size"].Value = fs.Length.ToString();                itemNode.Attributes["prefect"].Value = "0";
                //为V2.4.3升级准备
                BinaryReader br = new BinaryReader(fs);                //这里是文件的实际内容，使用了Base64String编码
                //itemNode.SelectSingleNode("value").InnerText = Convert.ToBase64String(br.ReadBytes((int)fs.Length), 0, (int)fs.Length);
                br.Close();
                fs.Close();
            }
            return doc.InnerXml;
        }        #region 获取文件列表以及信息列表
        [WebMethod(Description = "获取文件概要信息")]
        public UpdateInfoTable[] GetUpdateInfo()
        {
            
            UpdateInfoTable[] tables = null;//返回类数组
            try
            {
                //  List<UpdateInfoTable> list = new List<UpdateInfoTable>();
                Dictionary<string, string> dr = new Dictionary<string, string>();
                               //取得更新的xml模板内容
                XmlDocument doc = new XmlDocument();
                doc.Load(Server.MapPath("update.xml"));
                XmlElement root = doc.DocumentElement;                //看看有几个文件需要更新
                XmlNode updateNode = root.SelectSingleNode("filelist");
                string path = updateNode.Attributes["sourcepath"].Value;
                int count = int.Parse(updateNode.Attributes["count"].Value);
                tables = new UpdateInfoTable[count];
                for (int i = 0; i < count; i++)
                {
                    tables[i] = new UpdateInfoTable();
                    XmlNode itemNode = updateNode.ChildNodes[i];
                    string fileName = path + itemNode.Attributes["name"].Value;
                    string name = itemNode.Attributes["name"].Value;//文件名称                    FileStream fs = File.OpenRead(Server.MapPath(fileName));
                    itemNode.Attributes["size"].Value = fs.Length.ToString();
                    string fileLength = fs.Length.ToString();//文件大小
                    if (!dr.ContainsValue(name))
                    {
                        dr.Add(name, fileLength);                        tables[i].FileLength = fileLength;
                        tables[i].FileName = name;                    }
                }
            }
            catch
            {
                tables = null;
            }
            return tables ;        }
        #endregion        #region 由文件名称和数据帧断点续传
        [WebMethod(Description = "取任需上传数据")]
        public Byte[] GetContinuePacketRequest(string fileName, int nFrame)
        {
            byte[] byReturn = null;
            try
            {
                //取得更新的xml模板内容
                string path = "./update/" + fileName;
                string filePathres = string.Format(@"{0}", path);//路径
                string fileFullName = HttpContext.Current.Request.PhysicalApplicationPath + filePathres.Replace("/", "\\");                //打开文件流
                FileStream fs = File.OpenRead(fileFullName);                //游标记录从哪里开始取数据
                long offset = nFrame * BUFFER_SIZE;
                fs.Seek(offset, SeekOrigin.Begin);                BinaryReader br = new BinaryReader(fs);
                if (BUFFER_SIZE * (nFrame + 1) > fs.Length)
                {
                    int size = Convert.ToInt32(fs.Length - BUFFER_SIZE * nFrame);
                    byReturn = br.ReadBytes(size);
                }
                else
                {
                    byReturn = br.ReadBytes(BUFFER_SIZE);
                }
                br.Close();
                fs.Close();
            
            }
            catch
            {
            }
            return byReturn;
             
        }        #endregion

Answer 2

客户端：
    /// <summary>
        /// 执行下载
        /// </summary>
        public static bool ExecutePro()
        {
             byte[] getBytes = null;
             Services ser = new Services();
             bool fileExist = false;
             string downFile = "";               System.Xml.XmlDocument doc =new XmlDocument ();
            try
            {
                #region 判断下载文件文件是否已经存在如果存在不需下载
                string str = Application.StartupPath + @"\update.xml";
                bool s = System.IO.File.Exists(str);
                if (!s)
                {
                    doc = ((System.Xml.XmlDocument)ser.GetNewVersionContent());
                    if (doc == null)
                    {
                        MessageBox.Show("未能从服务器上获取更新版本信息，请联系网站管理员!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                        return false;
                    }
                    doc.Save(Application.StartupPath + @"\update.xml");
                }
                else
                {
                    doc.Load(Application.StartupPath + @"\update.xml");
                }
                dp = new DownLoadPacket();
                dp.Buffer = GetDownLoadLength().ToString();
                #endregion                #region 查看download文件夹是否存在,不存在则新建
                downFile = Application.StartupPath + @"\download\";
                fileExist = Directory.Exists(downFile);                if (!fileExist)   
                {
                    Directory.CreateDirectory(downFile); //新建文件夹   
                }                string imageFile = Application.StartupPath + @"\images\";
                bool imageExist = Directory.Exists(imageFile);
                if (!imageExist)
                {
                    Directory.CreateDirectory(imageFile); //新建文件夹   
                }
                #endregion                #region 处理自动升级程序自动更新, 断点续传
               
                XmlElement root = doc.DocumentElement;
                XmlNode updateNode = root.SelectSingleNode("filelist");
                int count = int.Parse(updateNode.Attributes["count"].Value);
                for (int i = 0; i < count; i++)
                {
                    int nFrame = 0;
                    XmlNode itemNode = updateNode.ChildNodes[i];
                    string fileName =  itemNode.Attributes["name"].Value;//文件名称
                    string size = itemNode.Attributes["size"].Value;//文件大小
                    string prefect = itemNode.Attributes["prefect"].Value;//文件的完成度                    #region//如果文件下载度与文件大小不一致说明文件未下载完成
                    if (size !=prefect)
                    {
                        #region //如果执行文件为空说明未曾下载
                        if (prefect =="0")
                        {
                            double nMaxFrame = Math.Ceiling(Convert.ToDouble(size) / BUFFER_SIZE);
                            int nmaxFrame = Convert.ToInt32(nMaxFrame);
                            nFrame = 0;
                            for (int j = 0; j < nmaxFrame ; j++)
                            {
                              
                                //从服务器取字节数字
                                getBytes = ser.GetContinuePacket(fileName, nFrame);                                //将下载的文件放在download文件夹下
                                string fileFullName = Application.StartupPath + @"\download\" + fileName;//文件全路径
                                FileStream fs = new FileStream(fileFullName, FileMode.OpenOrCreate);
                                long offset = nFrame * BUFFER_SIZE;
                                fs.Seek(offset, SeekOrigin.Begin);
                                BinaryWriter bw = new BinaryWriter(fs);
                                int updatesize = 0;
                                if (BUFFER_SIZE * (nFrame + 1) > Convert.ToInt32(size))
                                {
                                    updatesize = Convert.ToInt32(Convert.ToInt32(size) - BUFFER_SIZE * nFrame);
                                    bw.Write(getBytes);                                }
                                else
                                {
                                    updatesize = BUFFER_SIZE;
                                    bw.Write(getBytes);
                                }
                                bw.Close();
                                fs.Close();
                                //更新进度条的状态
                                //if (nFrame >= 1)
                                //{
                                dp.Buffer = (Convert.ToInt32(dp.Buffer) + updatesize).ToString();
                                 Updateprefect(fileName, updatesize.ToString());
                                //}
                                
                                nFrame++;
                                continue;
                            }                        }
                        #endregion                        #region 如果文件部分下载
                        else
                        {
                            double nMaxFrame = Math.Ceiling(Convert.ToDouble(size) / BUFFER_SIZE);
                            //看已经下载了有几帧
                            nFrame = Convert.ToInt32(prefect) / BUFFER_SIZE;//开始帧
                            for (int j = nFrame; j < Convert.ToInt32(nMaxFrame); j++)
                            {
                                //从服务器取字节数字
                                getBytes = ser.GetContinuePacket(fileName, nFrame);                                //将下载的文件放在download文件夹下
                                string fileFullName = Application.StartupPath + @"\download\" + fileName;//文件全路径
                                FileStream fs = new FileStream(fileFullName, FileMode.OpenOrCreate);
                                long offset = nFrame * BUFFER_SIZE;
                                fs.Seek(offset, SeekOrigin.Begin);
                                BinaryWriter bw = new BinaryWriter(fs);                                int updatesize = 0;
                                if (BUFFER_SIZE * (nFrame + 1) > Convert.ToInt32(size))
                                {
                                    updatesize = Convert.ToInt32(Convert.ToInt32(size) - BUFFER_SIZE * nFrame);
                                    bw.Write(getBytes);                                }
                                else
                                {
                                    updatesize = BUFFER_SIZE;
                                    bw.Write(getBytes);
                                }
                               
                                bw.Close();
                                fs.Close();
                                //更新进度条的状态
                                dp.Buffer = (Convert.ToInt32(dp.Buffer) + updatesize).ToString();
                                Updateprefect(fileName, updatesize.ToString());
                                nFrame++;
                                 
                            }
 
                        }
                        #endregion                    }
                    #endregion                    #region//文件已经下载完成
                    else
                    {
                        continue;
                    }
                    #endregion                }
                #endregion                return true;
            }
            catch(Exception ex)
            {
                return false;
            }
        }

Answer 3

http://www.google.com.hk/#newwindow=1&q=c%23+%E6%96%AD%E7%82%B9%E7%BB%AD%E4%BC%A0&safe=strict