FtpClient-C#使用Sockets操作FTP（含ftp客户端下载地址）

示例下载地址

 
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*第5-7位表示和这个文件属主所在同一个组的用户所具有的权限。 *第8-10位表示其他用户所具有的权限。 *例如： * drwxr-xr-x 1 ftp ftp              0 Mar 02  2011 a安全防护 * -r--r--r-- 1 ftp ftp       27772416 Mar 02  2011 0302 */ namespace JM_IM_COMP.tool {     ///     /// FTP类     ///     public class FTP     {         #region 变量声明           ///         /// 服务器连接地址         ///         public string server;           ///         /// 登陆帐号         ///         public string user;           ///         /// 登陆口令         ///         public string pass;           ///         /// 端口号         ///         public int port;           ///         /// 无响应时间（FTP在指定时间内无响应）         ///         public int timeout;           ///         /// 服务器错误状态信息         ///         public string errormessage;             ///         /// 服务器状态返回信息         ///         private string messages;           ///         /// 服务器的响应信息         ///         private string responseStr;           ///         /// 链接模式（主动或被动，默认为被动）         ///         private bool passive_mode;           ///         /// 上传或下载信息字节数         ///         private long bytes_total;           ///         /// 上传或下载的文件大小         ///         private long file_size;           ///         /// 主套接字         ///         private Socket main_sock;           ///         /// 要链接的网络地址终结点         ///         private IPEndPoint main_ipEndPoint;           ///         /// 侦听套接字         ///         private Socket listening_sock;           ///         /// 数据套接字         ///         private Socket data_sock;           ///         /// 要链接的网络数据地址终结点         ///         private IPEndPoint data_ipEndPoint;           ///         /// 用于上传或下载的文件流对象         ///         private FileStream file;           ///         /// 与FTP服务器交互的状态值         ///         private int response;           ///         /// 读取并保存当前命令执行后从FTP服务器端返回的数据信息         ///         private string bucket;           #endregion           #region 构造函数           ///         /// 构造函数         ///         public FTP()         {             server = null;             user = null;             pass = null;             port = 21;             passive_mode = true;             main_sock = null;             main_ipEndPoint = null;             listening_sock = null;             data_sock = null;             data_ipEndPoint = null;             file = null;             bucket = "";             bytes_total = 0;             timeout = 10000;    //无响应时间为10秒             messages = "";             errormessage = "";         }           ///         /// 构造函数         ///         /// 服务器IP或名称         /// 登陆帐号         /// 登陆口令         public FTP(string server, string user, string pass)         {             this.server = server;             this.user = user;             this.pass = pass;             port = 21;             passive_mode = true;             main_sock = null;             main_ipEndPoint = null;             listening_sock = null;             data_sock = null;             data_ipEndPoint = null;             file = null;             bucket = "";             bytes_total = 0;             timeout = 10000;    //无响应时间为10秒             messages = "";             errormessage = "";         }           ///         /// 构造函数         ///         /// 服务器IP或名称         /// 端口号         /// 登陆帐号         /// 登陆口令         public FTP(string server, int port, string user, string pass)         {             this.server = server;             this.user = user;             this.pass = pass;             this.port = port;             passive_mode = true;             main_sock = null;             main_ipEndPoint = null;             listening_sock = null;             data_sock = null;             data_ipEndPoint = null;             file = null;             bucket = "";             bytes_total = 0;             timeout = 10000;    //无响应时间为10秒             messages = "";             errormessage = "";         }             ///         /// 构造函数         ///         /// 服务器IP或名称         /// 端口号         /// 登陆帐号         /// 登陆口令         /// 链接方式         public FTP(string server, int port, string user, string pass, int mode)         {             this.server = server;             this.user = user;             this.pass = pass;             this.port = port;             passive_mode = mode <= 1 ? true : false;             main_sock = null;             main_ipEndPoint = null;             listening_sock = null;             data_sock = null;             data_ipEndPoint = null;             file = null;             bucket = "";             bytes_total = 0;             this.timeout = 10000;    //无响应时间为10秒             messages = "";             errormessage = "";         }           ///         /// 构造函数         ///         /// 服务器IP或名称         /// 端口号         /// 登陆帐号         /// 登陆口令         /// 链接方式         /// 无响应时间(限时),单位:秒 (小于或等于0为不受时间限制)         public FTP(string server, int port, string user, string pass, int mode, int timeout_sec)         {             this.server = server;             this.user = user;             this.pass = pass;             this.port = port;             passive_mode = mode <= 1 ? true : false;             main_sock = null;             main_ipEndPoint = null;             listening_sock = null;             data_sock = null;             data_ipEndPoint = null;             file = null;             bucket = "";             bytes_total = 0;             this.timeout = (timeout_sec <= 0) ? int.MaxValue : (timeout_sec * 1000);    //无响应时间             messages = "";             errormessage = "";         }           #endregion           #region 属性         ///         /// 当前是否已连接         ///         public bool IsConnected         {             get             {                 if (main_sock != null)                     return main_sock.Connected;                 return false;             }         }           ///         /// 当message缓冲区有数据则返回         ///         public bool MessagesAvailable         {             get             {                 if (messages.Length > 0)                     return true;                 return false;             }         }           ///         /// 获取服务器状态返回信息, 并清空messages变量         ///         public string Messages         {             get             {                 string tmp = messages;                 messages = "";                 return tmp;             }         }         ///         /// 最新指令发出后服务器的响应         ///         public string ResponseString         {             get             {                 return responseStr;             }         }             ///         ///在一次传输中,发送或接收的字节数         ///         public long BytesTotal         {             get             {                 return bytes_total;             }         }           ///         ///被下载或上传的文件大小,当文件大小无效时为0         ///         public long FileSize         {             get             {                 return file_size;             }         }           ///         /// 链接模式:         /// true 被动模式 [默认]         /// false: 主动模式         ///         public bool PassiveMode         {             get             {                 return passive_mode;             }             set             {                 passive_mode = value;             }         }           #endregion           #region 操作           ///         /// 操作失败         ///         private void Fail()         {             Disconnect();             errormessage += responseStr;             //throw new Exception(responseStr);         }           ///         /// 下载文件类型         ///         /// true:二进制文件 false:字符文件         private void SetBinaryMode(bool mode)         {             if (mode)                 SendCommand("TYPE I");             else                 SendCommand("TYPE A");               ReadResponse();             if (response != 200)                 Fail();         }           ///         /// 发送命令         ///         ///         private void SendCommand(string command)         {             Byte[] cmd = Encoding.Default.GetBytes((command + "\r\n").ToCharArray());               if (command.Length > 3 && command.Substring(0, 4) == "PASS")             {                 messages = "\rPASS xxx";             }             else             {                 messages = "\r" + command;             }               try             {                 main_sock.Send(cmd, cmd.Length, 0);             }             catch (Exception ex)             {                 try                 {                     Disconnect();                     errormessage += ex.Message;                     return;                 }                 catch                 {                     main_sock.Close();                     file.Close();                     main_sock = null;                     main_ipEndPoint = null;                     file = null;                 }             }         }             private void FillBucket()         {             Byte[] bytes = new Byte[512];             long bytesgot;             int msecs_passed = 0;               while (main_sock.Available < 1)             {                 System.Threading.Thread.Sleep(50);                 msecs_passed += 50;                 //当等待时间到,则断开链接                 if (msecs_passed > timeout)                 {                     Disconnect();                     errormessage += "Timed out waiting on server to respond.";                     return;                 }             }               while (main_sock.Available > 0)             {                 bytesgot = main_sock.Receive(bytes, 512, 0);                 bucket += Encoding.Default.GetString(bytes, 0, (int) bytesgot);                 System.Threading.Thread.Sleep(50);             }         }             private string GetLineFromBucket()         {             int i;             string buf = "";               if ((i = bucket.IndexOf('\n')) < 0)             {                 while (i < 0)                 {                     FillBucket();                     i = bucket.IndexOf('\n');                 }             }               buf = bucket.Substring(0, i);             bucket = bucket.Substring(i + 1);               return buf;         }             ///         /// 返回服务器端返回信息         ///         private void ReadResponse()         {             string buf;             messages = "";               while (true)             {                 buf = GetLineFromBucket();                   if (Regex.Match(buf, "^[0-9]+ ").Success)                 {                     responseStr = buf;                     response = int.Parse(buf.Substring(0, 3));                     break;                 }                 else                     messages += Regex.Replace(buf, "^[0-9]+-", "") + "\n";             }         }             ///         /// 打开数据套接字         ///         private void OpenDataSocket()         {             if (passive_mode)             {                 string[] pasv;                 string server;                 int port;                   Connect();                 SendCommand("PASV");                 ReadResponse();                 if (response != 227)                     Fail();                   try                 {                     int i1, i2;                       i1 = responseStr.IndexOf('(') + 1;                     i2 = responseStr.IndexOf(')') - i1;                     pasv = responseStr.Substring(i1, i2).Split(',');                 }                 catch (Exception)                 {                     Disconnect();                     errormessage += "Malformed PASV response: " + responseStr;                     return;                 }                   if (pasv.Length < 6)                 {                     Disconnect();                     errormessage += "Malformed PASV response: " + responseStr;                     return;                 }                   server = String.Format("{0}.{1}.{2}.{3}", pasv[0], pasv[1], pasv[2], pasv[3]);                 port = (int.Parse(pasv[4]) << 8) + int.Parse(pasv[5]);                   try                 {                     CloseDataSocket();                       data_sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);   #if NET1                     data_ipEndPoint = new IPEndPoint(Dns.GetHostByName(server).AddressList[0], port); #else                     data_ipEndPoint = new IPEndPoint(System.Net.Dns.GetHostEntry(server).AddressList[0], port); #endif                       data_sock.Connect(data_ipEndPoint);                   }                 catch (Exception ex)                 {                     errormessage += "Failed to connect for data transfer: " + ex.Message;                     return;                 }             }             else             {                 Connect();                   try                 {                     CloseDataSocket();                       listening_sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);                       // 对于端口,则发送IP地址.下面则提取相应信息                     string sLocAddr = main_sock.LocalEndPoint.ToString();                     int ix = sLocAddr.IndexOf(':');                     if (ix < 0)                     {                         errormessage += "Failed to parse the local address: " + sLocAddr;                         return;                     }                     string sIPAddr = sLocAddr.Substring(0, ix);                     // 系统自动绑定一个端口号(设置 port = 0)                     System.Net.IPEndPoint localEP = new IPEndPoint(IPAddress.Parse(sIPAddr), 0);                       listening_sock.Bind(localEP);                     sLocAddr = listening_sock.LocalEndPoint.ToString();                     ix = sLocAddr.IndexOf(':');                     if (ix < 0)                     {                         errormessage += "Failed to parse the local address: " + sLocAddr;                       }                     int nPort = int.Parse(sLocAddr.Substring(ix + 1));                       // 开始侦听链接请求                     listening_sock.Listen(1);                     string sPortCmd = string.Format("PORT {0},{1},{2}",                                                     sIPAddr.Replace('.', ','),                                                     nPort / 256, nPort % 256);                     SendCommand(sPortCmd);                     ReadResponse();                     if (response != 200)                         Fail();                 }                 catch (Exception ex)                 {                     errormessage += "Failed to connect for data transfer: " + ex.Message;                     return;                 }             }         }             private void ConnectDataSocket()         {             if (data_sock != null)        // 已链接                 return;               try             {                 data_sock = listening_sock.Accept();    // Accept is blocking                 listening_sock.Close();                 listening_sock = null;                   if (data_sock == null)                 {                     throw new Exception("Winsock error: " +                         Convert.ToString(System.Runtime.InteropServices.Marshal.GetLastWin32Error()));                 }             }             catch (Exception ex)             {                 errormessage += "Failed to connect for data transfer: " + ex.Message;             }         }             private void CloseDataSocket()         {             if (data_sock != null)             {                 if (data_sock.Connected)                 {                     data_sock.Close();                 }                 data_sock = null;             }               data_ipEndPoint = null;         }           ///         /// 关闭所有链接         ///         public void Disconnect()         {             CloseDataSocket();               if (main_sock != null)             {                 if (main_sock.Connected)                 {                     SendCommand("QUIT");                     main_sock.Close();                 }                 main_sock = null;             }               if (file != null)                 file.Close();               main_ipEndPoint = null;             file = null;         }           ///         /// 链接到FTP服务器         ///         /// 要链接的IP地址或主机名         /// 端口号         /// 登陆帐号         /// 登陆口令         public void Connect(string server, int port, string user, string pass)         {             this.server = server;             this.user = user;             this.pass = pass;             this.port = port;               Connect();         }           ///         /// 链接到FTP服务器         ///         /// 要链接的IP地址或主机名         /// 登陆帐号         /// 登陆口令         public void Connect(string server, string user, string pass)         {             this.server = server;             this.user = user;             this.pass = pass;               Connect();         }           ///         /// 链接到FTP服务器         ///         public bool Connect()         {             if (server == null)             {                 errormessage += "No server has been set.\r\n";             }             if (user == null)             {                 errormessage += "No server has been set.\r\n";             }               if (main_sock != null)                 if (main_sock.Connected)                     return true;               try             {                 main_sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); #if NET1                 main_ipEndPoint = new IPEndPoint(Dns.GetHostByName(server).AddressList[0], port); #else                 main_ipEndPoint = new IPEndPoint(System.Net.Dns.GetHostEntry(server).AddressList[0], port); #endif                   main_sock.Connect(main_ipEndPoint);             }             catch (Exception ex)             {                 errormessage += ex.Message;                 return false;             }               ReadResponse();             if (response != 220)                 Fail();               SendCommand("USER " + user);             ReadResponse();               switch (response)             {             case 331:                 if (pass == null)                 {                     Disconnect();                     errormessage += "No password has been set.";                     return false;                 }                 SendCommand("PASS " + pass);                 ReadResponse();                 if (response != 230)                 {                     Fail();                     return false;                 }                 break;             case 230:                 break;             }               return true;         }           ///         /// 获取FTP当前(工作)目录下的文件列表         ///         /// 返回文件列表数组         public ArrayList List()         {             Byte[] bytes = new Byte[512];             string file_list = "";             long bytesgot = 0;             int msecs_passed = 0;             ArrayList list = new ArrayList();               Connect();             OpenDataSocket();             SendCommand("LIST");             ReadResponse();               switch (response)             {             case 125:             case 150:                 break;             default:                 CloseDataSocket();                 throw new Exception(responseStr);             }             ConnectDataSocket();               while (data_sock.Available < 1)             {                 System.Threading.Thread.Sleep(50);                 msecs_passed += 50;                   if (msecs_passed > (timeout / 10))                 {                     break;                 }             }               while (data_sock.Available > 0)             {                 bytesgot = data_sock.Receive(bytes, bytes.Length, 0);                 //file_list += Encoding.ASCII.GetString(bytes, 0, (int) bytesgot);                 file_list += Encoding.Default.GetString(bytes, 0, (int)bytesgot);                 System.Threading.Thread.Sleep(50);             }               CloseDataSocket();               ReadResponse();             if (response != 226)                 throw new Exception(responseStr);               foreach (string f in file_list.Split('\n'))             {                 if (f.Length > 0 && !Regex.Match(f, "^total").Success)                     list.Add(f.Substring(0, f.Length - 1));             }               return list;         }           ///         /// 获取到文件名列表         ///         /// 返回文件名列表         public ArrayList ListFiles()         {             ArrayList list = new ArrayList();               foreach (string f in List())             {                 if ((f.Length > 0))                 {                     if ((f[0] != 'd') && (f.ToUpper().IndexOf("") < 0))                         list.Add(f);                 }             }               return list;         }           ///         /// 获取路径列表         ///         /// 返回路径列表         public ArrayList ListDirectories()         {             ArrayList list = new ArrayList();               foreach (string f in List())             {                 if (f.Length > 0)                 {                     if ((f[0] == 'd') || (f.ToUpper().IndexOf("") >= 0))                         list.Add(f);                 }             }               return list;         }           ///         /// 获取原始数据信息.         ///         /// 远程文件名         /// 返回原始数据信息.         public string GetFileDateRaw(string fileName)         {             Connect();               SendCommand("MDTM " + fileName);             ReadResponse();             if (response != 213)             {                 errormessage += responseStr;                 return "";             }               return (this.responseStr.Substring(4));         }           ///         /// 得到文件日期.         ///         /// 远程文件名         /// 返回远程文件日期         public DateTime GetFileDate(string fileName)         {             return ConvertFTPDateToDateTime(GetFileDateRaw(fileName));         }           private DateTime ConvertFTPDateToDateTime(string input)         {             if (input.Length < 14)                 throw new ArgumentException("Input Value for ConvertFTPDateToDateTime method was too short.");               //YYYYMMDDhhmmss":             int year = Convert.ToInt16(input.Substring(0, 4));             int month = Convert.ToInt16(input.Substring(4, 2));             int day = Convert.ToInt16(input.Substring(6, 2));             int hour = Convert.ToInt16(input.Substring(8, 2));             int min = Convert.ToInt16(input.Substring(10, 2));             int sec = Convert.ToInt16(input.Substring(12, 2));               return new DateTime(year, month, day, hour, min, sec);         }           ///         /// 获取FTP上的当前(工作)路径         ///         /// 返回FTP上的当前(工作)路径         public string GetWorkingDirectory()         {             //PWD - 显示工作路径             Connect();             SendCommand("PWD");             ReadResponse();               if (response != 257)             {                 errormessage += responseStr;             }               string pwd;             try             {                 pwd = responseStr.Substring(responseStr.IndexOf("\"", 0) + 1);//5);                 pwd = pwd.Substring(0, pwd.LastIndexOf("\""));                 pwd = pwd.Replace("\"\"", "\""); // 替换带引号的路径信息符号             }             catch (Exception ex)             {                 errormessage += ex.Message;                 return null;             }               return pwd;         }             ///         /// 跳转服务器上的当前(工作)路径         ///         /// 要跳转的路径         public bool ChangeDir(string path)         {             Connect();             SendCommand("CWD " + path);             ReadResponse();             if (response != 250)             {                 errormessage += responseStr;                 return false;             }             return true;         }           ///         /// 创建指定的目录         ///         /// 要创建的目录         public void MakeDir(string dir)         {             Connect();             SendCommand("MKD " + dir);             ReadResponse();               switch (response)             {             case 257:             case 250:                 break;             default:                 {                     errormessage += responseStr;                     break;                 }             }         }           ///         /// 移除FTP上的指定目录         ///         /// 要移除的目录         public void RemoveDir(string dir)         {             Connect();             SendCommand("RMD " + dir);             ReadResponse();             if (response != 250)             {                 errormessage += responseStr;                 return;                 ;             }         }           ///         /// 移除FTP上的指定文件         ///         /// 要移除的文件名称         public void RemoveFile(string filename)         {             Connect();             SendCommand("DELE " + filename);             ReadResponse();             if (response != 250)             {                 errormessage += responseStr;             }         }           ///         /// 重命名FTP上的文件         ///         /// 原文件名         /// 新文件名         public void RenameFile(string oldfilename, string newfilename)         {             Connect();             SendCommand("RNFR " + oldfilename);             ReadResponse();             if (response != 350)             {                 errormessage += responseStr;             }             else             {                 SendCommand("RNTO " + newfilename);                 ReadResponse();                 if (response != 250)                 {                     errormessage += responseStr;                 }             }         }           ///         /// 获得指定文件的大小(如果FTP支持)         ///         /// 指定的文件         /// 返回指定文件的大小         public long GetFileSize(string filename)         {             Connect();             SendCommand("SIZE " + filename);             ReadResponse();             if (response != 213)             {                 errormessage += responseStr;             }               return Int64.Parse(responseStr.Substring(4));         }           ///         /// 上传指定的文件         ///         /// 要上传的文件         public bool OpenUpload(string filename)         {             return OpenUpload(filename, filename, false);         }           ///         /// 上传指定的文件         ///         /// 本地文件名         /// 远程要覆盖的文件名         public bool OpenUpload(string filename, string remotefilename)         {             return OpenUpload(filename, remotefilename, false);         }           ///         /// 上传指定的文件         ///         /// 本地文件名         /// 如果存在,则尝试恢复         public bool OpenUpload(string filename, bool resume)         {             return OpenUpload(filename, filename, resume);         }           ///         /// 上传指定的文件         ///         /// 本地文件名         /// 远程要覆盖的文件名         /// 如果存在,则尝试恢复         public bool OpenUpload(string filename, string remote_filename, bool resume)         {             Connect();             SetBinaryMode(true);             OpenDataSocket();               bytes_total = 0;               try             {                 file = new FileStream(filename, FileMode.Open);             }             catch (Exception ex)             {                 file = null;                 errormessage += ex.Message;                 return false;             }               file_size = file.Length;               if (resume)             {                 long size = GetFileSize(remote_filename);                 SendCommand("REST " + size);                 ReadResponse();                 if (response == 350)                     file.Seek(size, SeekOrigin.Begin);             }               SendCommand("STOR " + remote_filename);             ReadResponse();               switch (response)             {             case 125:             case 150:                 break;             default:                 file.Close();                 file = null;                 errormessage += responseStr;                 return false;             }             ConnectDataSocket();               return true;         }           ///         /// 下载指定文件         ///         /// 远程文件名称         public void OpenDownload(string filename)         {             OpenDownload(filename, filename, false);         }           ///         /// 下载并恢复指定文件         ///         /// 远程文件名称         /// 如文件存在,则尝试恢复         public void OpenDownload(string filename, bool resume)         {             OpenDownload(filename, filename, resume);         }           ///         /// 下载指定文件         ///         /// 远程文件名称         /// 本地文件名         public void OpenDownload(string remote_filename, string localfilename)         {             OpenDownload(remote_filename, localfilename, false);         }           ///         /// 打开并下载文件         ///         /// 远程文件名称         /// 本地文件名         /// 如果文件存在则恢复         public void OpenDownload(string remote_filename, string local_filename, bool resume)         {             Connect();             SetBinaryMode(true);               bytes_total = 0;               try             {                 file_size = GetFileSize(remote_filename);             }             catch             {                 file_size = 0;             }               if (resume && File.Exists(local_filename))             {                 try                 {                     file = new FileStream(local_filename, FileMode.Open);                 }                 catch (Exception ex)                 {                     file = null;                     throw new Exception(ex.Message);                 }                   SendCommand("REST " + file.Length);                 ReadResponse();                 if (response != 350)                     throw new Exception(responseStr);                 file.Seek(file.Length, SeekOrigin.Begin);                 bytes_total = file.Length;             }             else             {                 try                 {                     file = new FileStream(local_filename, FileMode.Create);                 }                 catch (Exception ex)                 {                     file = null;                     throw new Exception(ex.Message);                 }             }               OpenDataSocket();             SendCommand("RETR " + remote_filename);             ReadResponse();               switch (response)             {             case 125:             case 150:                 break;             default:                 file.Close();                 file = null;                 errormessage += responseStr;                 return;             }             ConnectDataSocket();               return;         }           ///         /// 上传文件(循环调用直到上传完毕)         ///         /// 发送的字节数         public long DoUpload()         {             Byte[] bytes = new Byte[512];             long bytes_got;               try             {                 bytes_got = file.Read(bytes, 0, bytes.Length);                 bytes_total += bytes_got;                 data_sock.Send(bytes, (int) bytes_got, 0);                   if (bytes_got <= 0)                 {                     //上传完毕或有错误发生                     file.Close();                     file = null;                       CloseDataSocket();                     ReadResponse();                     switch (response)                     {                     case 226:                     case 250:                         break;                     default: //当上传中断时                         {                             errormessage += responseStr;                             return -1;                         }                     }                       SetBinaryMode(false);                 }             }             catch (Exception ex)             {                 file.Close();                 file = null;                 CloseDataSocket();                 ReadResponse();                 SetBinaryMode(false);                 //throw ex;                 //当上传中断时                 errormessage += ex.Message;                 return -1;             }               return bytes_got;         }           ///         /// 下载文件(循环调用直到下载完毕)         ///         /// 接收到的字节点         public long DoDownload()         {             Byte[] bytes = new Byte[512];             long bytes_got;               try             {                 bytes_got = data_sock.Receive(bytes, bytes.Length, 0);                   if (bytes_got <= 0)                 {                     //下载完毕或有错误发生                     CloseDataSocket();                     file.Close();                     file = null;                       ReadResponse();                     switch (response)                     {                     case 226:                     case 250:                         break;                     default:                         {                             errormessage += responseStr;                             return -1;                         }                     }                       //SetBinaryMode(false);                     SetBinaryMode(true);//业务需要，使用二进制模式下载                     return bytes_got;                 }                   file.Write(bytes, 0, (int) bytes_got);                 bytes_total += bytes_got;             }             catch (Exception ex)             {                 CloseDataSocket();                 file.Close();                 file = null;                 ReadResponse();                 SetBinaryMode(false);                 //throw ex;                 //当下载中断时                 errormessage += ex.Message;                 return -1;             }               return bytes_got;         }           #endregion     } }

 使用例子：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 using System; using System.Collections; using System.IO; using Discuz.Common;   namespace Test {     class TestFtp     {         public void Test()         {             FTP ftp = new FTP("127.0.0.1", "abc", "123456");               //建立文件夹             ftp.MakeDir("com");             ftp.ChangeDir("com");             ftp.MakeDir("mzwu");             ftp.ChangeDir("mzwu");               //文件夹列表             ArrayList list = ftp.ListDirectories();             for (int i = 0; i < list.Count; i++)             {                 Console.WriteLine(list[i].ToString() + "
");             }               //删除文件夹(不能直接删除非空文件夹)             ftp.RemoveDir("com\\mzwu");               //上传文件             ftp.Connect();             ftp.OpenUpload(@"F:\mzwucom.jpg", Path.GetFileName(@"F:\mzwucom.jpg"));             while (ftp.DoUpload() > 0)             {                 int perc = (int) (((ftp.BytesTotal) * 100) / ftp.FileSize);                 Console.WriteLine(perc.ToString() + "%
");             }             ftp.Disconnect();               //下载文件             ftp.Connect();             ftp.OpenDownload("mzwucom.jpg", @"E:\mzwucom.jpg");             while (ftp.DoDownload() > 0)             {                 int perc = (int) (((ftp.BytesTotal) * 100) / ftp.FileSize);                 Console.WriteLine(perc.ToString() + "%
");             }             ftp.Disconnect();               //文件列表              list = ftp.ListFiles();             for (int i = 0; i < list.Count; i++)             {                 Console.WriteLine(list[i].ToString() + "
");             }               //文件重命名             ftp.RenameFile("mzwucom.jpg", "test.jpg");               //删除文件             ftp.RemoveFile("test.jpg");               //显示错误信息             Console.WriteLine(ftp.errormessage);         }       } }

示例下载地址

SSL数据加密，需要发送命令如下

client.execPBSZ(0); 
client.execPROT("P");
C技术FTP

相关

003.FTP客户端连接

004.FTP匿名用户访问

001.FTP简介及相关文件

虚拟用户vsftp

FTP服务

FTP配置虚拟用户

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比xshell和xftp都好用的工具。

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