using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Sockets;using System.Collections;using System.Net;using System.Runtime.Serialization;using System.Runtime.Serialization.Formatters.Binary;using System.IO;using System.Collections.Specialized;using System.Threading;public class DuxSocketClient{ #region 私有字段 /// <summary> /// 設置數據緩沖區大小 默認1024 /// </summary> private static int m_maxpacket = 1024 * 4; public delegate void SendFileProgress(int progress); public delegate void ReceiveFileProgress(int progress); #endregion #region 服務器偵聽 /// <summary> /// 服務器偵聽方法 返回null則說明沒有鏈接上 /// </summary> /// <returns>返回一個套接字(Socket)</returns> public static Socket ListenerSocket(TcpListener listener) {  try  {   Socket socket = listener.AcceptSocket();   return socket;  }  catch  {   return null;  } } /// <summary> /// 服務器偵聽方法 返回null則說明沒有鏈接上 /// </summary> /// <param name="listener"></param> /// <returns>返回一個網絡流</returns> public static NetworkStream ListenerStream(TcpListener listener) {  try  {   TcpClient client = listener.AcceptTcpClient();   return client.GetStream();  }  catch  {   return null;  } } #endregion #region 客戶端連接 public static Socket ConnectSocket(TcpClient tcpclient, IPEndPoint ipendpoint) {  try  {   tcpclient.Connect(ipendpoint);   return tcpclient.Client;  }  catch  {   return null;  } } public static Socket ConnectSocket(TcpClient tcpclient, IPAddress ipadd, int port) {  try  {   tcpclient.Connect(ipadd, port);   return tcpclient.Client;  }  catch  {   return null;  } } public static NetworkStream ConnectStream(TcpClient tcpclient, IPEndPoint ipendpoint) {  try  {   tcpclient.Connect(ipendpoint);   return tcpclient.GetStream();  }  catch  {   return null;  } } public static NetworkStream ConnectStream(TcpClient tcpclient, IPAddress ipadd, int port) {  try  {   tcpclient.Connect(ipadd, port);   return tcpclient.GetStream();  }  catch  {   return null;  } } #endregion #region Socket接收數據 /// <summary> /// 接受固定長度字符串 /// </summary> /// <param name="socket"></param> /// <param name="size"></param> /// <returns></returns> public static byte[] ReceiveFixData(Socket socket, int size) {  int offset = 0;  int recv = 0;  int dataleft = size;  byte[] msg = new byte[size];  while (dataleft > 0)  {   recv = socket.Receive(msg, offset, dataleft, 0);   if (recv == 0)   {    break;   }   offset += recv;   dataleft -= recv;  }  return msg; } /// <summary> /// 接收變長字符串 /// 為了處理粘包問題 ,每次發送數據時 包頭(數據字節長度) + 正文 /// 這個發送小數據 /// 設置包頭的字節為8,不能超過8位數的字節數組 /// </summary> /// <param name="socket"></param> /// <returns>byte[]數組</returns> public static byte[] ReceiveVarData(Socket socket) {  //每次接受數據時,接收固定長度的包頭,包頭長度為8  byte[] lengthbyte = ReceiveFixData(socket, 8);  //length得到字符長度 然后加工處理得到數字  int length = GetPacketLength(lengthbyte);  //得到正文  return ReceiveFixData(socket, length);   } /// <summary> /// 接收T類對象,反序列化 /// </summary> /// <typeparam name="T">接收T類對象,T類必須是一個可序列化類</typeparam> /// <param name="socket"></param> /// <returns></returns> public static T ReceiveVarData<T>(Socket socket) {  //先接收包頭長度 固定8個字節  byte[] lengthbyte = ReceiveFixData(socket, 8);  //得到字節長度  int length = GetPacketLength(lengthbyte);  byte[] bytecoll = new byte[m_maxpacket];  IFormatter format = new BinaryFormatter();  MemoryStream stream = new MemoryStream();  int offset = 0; //接收字節個數  int lastdata = length; //還剩下多少沒有接收,初始大小等于實際大小  int receivedata = m_maxpacket; //每次接收大小  //循環接收  int mark = 0; //標記幾次接收到的數據為0長度  while (true)  {   //剩下的字節數是否小于緩存大小   if (lastdata < m_maxpacket)    {    receivedata = lastdata; //就只接收剩下的字節數   }   int count = socket.Receive(bytecoll,0,receivedata,0);   if (count > 0)   {    stream.Write(bytecoll, 0, count);    offset += count;    lastdata -= count;    mark = 0;   }   else   {    mark++;    if (mark == 10)    {     break;    }   }   if (offset == length)   {    break;   }  }  stream.Seek(0, SeekOrigin.Begin); //必須要這個 或者stream.Position = 0;  T t = (T)format.Deserialize(stream);  stream.Close();  return t; } /// <summary> /// 在預先得到文件的文件名和大小 /// 調用此方法接收文件 /// </summary> /// <param name="socket"></param> /// <param name="path">路徑必須存在</param> public static bool ReceiveFile(Socket socket, string path, string filename, long size,ReceiveFileProgress progress) {  bool ret = false;  if (Directory.Exists(path))  {   //主要是防止有重名文件   string savepath = GetPath(path, filename); //得到文件路徑   //緩沖區   byte[] file = new byte[m_maxpacket];   int count = 0; //每次接收的實際長度   int receivedata = m_maxpacket; //每次要接收的長度   long offset = 0; //循環接收的總長度   long lastdata = size; //剩余多少還沒接收   int mark = 0;   using (FileStream fs = new FileStream(savepath, FileMode.OpenOrCreate, FileAccess.Write))   {    if (size > 0)    {     while (true)     {      if (lastdata < receivedata)      {       receivedata = Convert.ToInt32(lastdata);      }      count = socket.Receive(file, 0, receivedata, SocketFlags.None);      if (count > 0)      {       fs.Write(file, 0, count);       offset += count;       lastdata -= count;       mark = 0;      }      else      {       mark++; //連續5次接收為0字節 則跳出循環       if (mark ==10)       {        break;       }      }      //接收進度      if (progress != null)      {       progress(Convert.ToInt32(((Convert.ToDouble(offset) / Convert.ToDouble(size)) * 100)));      }      //接收完畢      if (offset == size)      {       ret = true;       break;      }     }    }    fs.Close();   }  }  return ret; } public static bool ReceiveFile(Socket socket, string path, string filename, long size) {  return ReceiveFile(socket, path, filename, size,null); } /// <summary> /// 預先不知道文件名和文件大小 用此方法接收 /// 此方法對于的發送方法是SendFile() /// </summary> /// <param name="socket"></param> /// <param name="path">要保存的目錄</param> public static void ReceiveFile(Socket socket, string path) {  //得到包頭信息字節數組 (文件名 + 文件大小 的字符串長度)  //取前8位  byte[] info_bt = ReceiveFixData(socket, 8);  //得到包頭信息字符長度  int info_length = GetPacketLength(info_bt);  //提取包頭信息,(文件名 + 文件大小 的字符串長度)  byte[] info = ReceiveFixData(socket, info_length);  //得到文件信息字符串 (文件名 + 文件大小)  string info_str = System.Text.Encoding.UTF8.GetString(info);  string[] strs = info_str.Split('|');  string filename = strs[0]; //文件名  long length = Convert.ToInt64(strs[1]); //文件大小  //開始接收文件  ReceiveFile(socket, path, filename, length); } private static int GetPacketLength(byte[] length) {  string str = System.Text.Encoding.UTF8.GetString(length);  str = str.TrimEnd('*'); ;//("*", "");  int _length = 0;  if (int.TryParse(str, out _length))  {   return _length;  }  else  {   return 0;  } } /// <summary> /// 得到文件路徑(防止有文件名重復) /// 如:aaa.txt已經在directory目錄下存在,則會得到文件aaa(1).txt /// </summary> /// <param name="directory">目錄名</param> /// <param name="file">文件名</param> /// <returns>文件路徑</returns> static int i = 0; static string markPath = String.Empty; public static string GetPath(string directory, string file) {  if (markPath == String.Empty)  {   markPath = Path.Combine(directory, file);  }  string path = Path.Combine(directory, file);  if (File.Exists(path))  {   i++;   string filename = Path.GetFileNameWithoutExtension(markPath) + "(" + i.ToString() + ")";   string extension = Path.GetExtension(markPath);   return GetPath(directory, filename + extension);  }  else  {   i = 0;   markPath = String.Empty;   return path;  } } #endregion #region Socket發送數據 /// <summary> /// 發送固定長度消息 /// 發送字節數不能大于int型最大值 /// </summary> /// <param name="socket"></param> /// <param name="msg"></param> /// <returns>返回發送字節個數</returns> public static int SendFixData(Socket socket, byte[] msg) {  int size = msg.Length; //要發送字節長度  int offset = 0;     //已經發送長度  int dataleft = size;  //剩下字符  int senddata = m_maxpacket; //每次發送大小  while (true)  {   //如過剩下的字節數 小于 每次發送字節數   if (dataleft < senddata)   {    senddata = dataleft;   }   int count = socket.Send(msg, offset, senddata, SocketFlags.None);   offset += count;   dataleft -= count;   if (offset == size)   {    break;   }  }  return offset; } /// <summary> /// 發送變長信息 格式 包頭(包頭占8位) + 正文 /// </summary> /// <param name="socket"></param> /// <param name="contact">發送文本</param> /// <returns></returns> public static int SendVarData(Socket socket, string contact) {  //得到字符長度  int size = System.Text.Encoding.UTF8.GetBytes(contact).Length;  //包頭字符  string length = GetSendPacketLengthStr(size);  //包頭 + 正文  byte[] sendbyte = System.Text.Encoding.UTF8.GetBytes(length + contact);  //發送  return SendFixData(socket, sendbyte); } /// <summary> /// 發送變成信息 /// </summary> /// <param name="socket"></param> /// <param name="bytes"></param> /// <returns></returns> public static int SendVarData(Socket socket, byte[] bytes) {  //得到包頭字節  int size = bytes.Length;  string length = GetSendPacketLengthStr(size);  byte[] lengthbyte = System.Text.Encoding.UTF8.GetBytes(length);  //發送包頭  SendFixData(socket, lengthbyte);  //因為不知道正文是什么編碼所以沒有合并  //發送正文  return SendFixData(socket, bytes); } /// <summary> /// 發送T類型對象,序列化 /// </summary> /// <typeparam name="T">T類型</typeparam> /// <param name="socket"></param> /// <param name="obj">T類型對象,必須是可序列化的</param> /// <returns></returns> public static int SendSerializeObject<T>(Socket socket, T obj) {  byte[] bytes = SerializeObject(obj);  return SendVarData(socket, bytes); } /// <summary> /// 發送文件 /// </summary> /// <param name="socket">socket對象</param> /// <param name="path">文件路徑</param> /// <param name="issend">是否發送文件(頭)信息,如果當前知道文件[大小,名稱]則為false</param> /// <param name="progress"></param> /// <returns></returns> public static bool SendFile(Socket socket, string path,bool issend,SendFileProgress progress) {  bool ret = false;  if (File.Exists(path))  {   FileInfo fileinfo = new FileInfo(path);   string filename = fileinfo.Name;   long length = fileinfo.Length;   //發送文件信息   if (issend)   {    SendVarData(socket, filename + "|" + length);   }   //發送文件   long offset = 0;   byte[] b = new byte[m_maxpacket];   int mark = 0;   using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))   {    int senddata = b.Length;    long i = length;    //循環讀取發送    while (true)    {     int count = fs.Read(b, 0, senddata);     if (count > 0)     {      socket.Send(b, 0, count, SocketFlags.None);      offset += count;      mark = 0;     }     else     {      mark++;      if (mark == 10)      {       break;      }     }     if (progress != null)     {      progress(Convert.ToInt32(((Convert.ToDouble(offset) / Convert.ToDouble(length)) * 100)));     }     if (offset == length)     {      break;     }     Thread.Sleep(50); //設置等待時間,以免粘包    }   }  }  return ret; } /// <summary> /// 發送文件,不需要進度信息 /// </summary> /// <param name="socket">socket對象</param> /// <param name="path">文件路徑</param> /// <param name="issend">是否發生(頭)信息</param> /// <returns></returns> public static bool SendFile(Socket socket, string path,bool issend) {  return SendFile(socket, path, issend, null); } /// <summary> /// 發送文件,不需要進度信息和(頭)信息 /// </summary> /// <param name="socket">socket對象</param> /// <param name="path">文件路徑</param> /// <returns></returns> public static bool SendFile(Socket socket, string path) {  return SendFile(socket, path, false, null); } private static byte[] SerializeObject(object obj) {  IFormatter format = new BinaryFormatter();  MemoryStream stream = new MemoryStream();  format.Serialize(stream, obj);  byte[] ret = stream.ToArray();  stream.Close();  return ret; } private static string GetSendPacketLengthStr(int size) {  string length = size.ToString() + "********"; //得到size的長度  return length.Substring(0, 8); //截取前前8位 } #endregion #region NetworkStream接收數據 //沒寫 #endregion #region NetworkStream發送數據 //沒寫 #endregion}

SendFixData(socket,"01");

ReceiveFixData(socket,2); //size 就為2

string txt = ????  //不知道有多少字符

SendVarData(socket,txt); //有重載版

ReceiveVarData(socket);