C#之Socket操作类实例解析

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>
 /// 设置数据缓冲区大小 默认1024
 /// </summary>
 private static int m_maxpacket = 1024 * 4;
 public delegate void sendfileprogress(int progress);
 public delegate void receivefileprogress(int progress);
 #endregion
 #region 服务器侦听
 /// <summary>
 /// 服务器侦听方法 返回null则说明没有链接上
 /// </summary>
 /// <returns>返回一个套接字(socket)</returns>
 public static socket listenersocket(tcplistener listener)
 {
  try
  {
   socket socket = listener.acceptsocket();
   return socket;
  }
  catch
  {
   return null;
  }
 }
 /// <summary>
 /// 服务器侦听方法 返回null则说明没有链接上
 /// </summary>
 /// <param name="listener"></param>
 /// <returns>返回一个网络流</returns>
 public static networkstream listenerstream(tcplistener listener)
 {
  try
  {
   tcpclient client = listener.accepttcpclient();
   return client.getstream();
  }
  catch
  {
   return null;
  }
 }
 #endregion
 #region 客户端连接
 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接收数据
 /// <summary>
 /// 接受固定长度字符串
 /// </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>
 /// 接收变长字符串
 /// 为了处理粘包问题 ,每次发送数据时 包头(数据字节长度) + 正文
 /// 这个发送小数据
 /// 设置包头的字节为8,不能超过8位数的字节数组
 /// </summary>
 /// <param name="socket"></param>
 /// <returns>byte[]数组</returns>
 public static byte[] receivevardata(socket socket)
 {
  //每次接受数据时,接收固定长度的包头,包头长度为8
  byte[] lengthbyte = receivefixdata(socket, 8);
  //length得到字符长度 然后加工处理得到数字
  int length = getpacketlength(lengthbyte);
  //得到正文
  return receivefixdata(socket, length);  
 }
 /// <summary>
 /// 接收t类对象,反序列化
 /// </summary>
 /// <typeparam name="t">接收t类对象,t类必须是一个可序列化类</typeparam>
 /// <param name="socket"></param>
 /// <returns></returns>
 public static t receivevardata<t>(socket socket)
 {
  //先接收包头长度 固定8个字节
  byte[] lengthbyte = receivefixdata(socket, 8);
  //得到字节长度
  int length = getpacketlength(lengthbyte);
  byte[] bytecoll = new byte[m_maxpacket];
  iformatter format = new binaryformatter();
  memorystream stream = new memorystream();
  int offset = 0; //接收字节个数
  int lastdata = length; //还剩下多少没有接收,初始大小等于实际大小
  int receivedata = m_maxpacket; //每次接收大小
  //循环接收
  int mark = 0; //标记几次接收到的数据为0长度
  while (true)
  {
   //剩下的字节数是否小于缓存大小
   if (lastdata < m_maxpacket) 
   {
    receivedata = lastdata; //就只接收剩下的字节数
   }
   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); //必须要这个 或者stream.position = 0;
  t t = (t)format.deserialize(stream);
  stream.close();
  return t;
 }
 /// <summary>
 /// 在预先得到文件的文件名和大小
 /// 调用此方法接收文件
 /// </summary>
 /// <param name="socket"></param>
 /// <param name="path">路径必须存在</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); //得到文件路径
   //缓冲区
   byte[] file = new byte[m_maxpacket];
   int count = 0; //每次接收的实际长度
   int receivedata = m_maxpacket; //每次要接收的长度
   long offset = 0; //循环接收的总长度
   long lastdata = size; //剩余多少还没接收
   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++; //连续5次接收为0字节 则跳出循环
       if (mark ==10)
       {
        break;
       }
      }
      //接收进度
      if (progress != null)
      {
       progress(convert.toint32(((convert.todouble(offset) / convert.todouble(size)) * 100)));
      }
      //接收完毕
      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>
 /// 预先不知道文件名和文件大小 用此方法接收
 /// 此方法对于的发送方法是sendfile()
 /// </summary>
 /// <param name="socket"></param>
 /// <param name="path">要保存的目录</param>
 public static void receivefile(socket socket, string path)
 {
  //得到包头信息字节数组 (文件名 + 文件大小 的字符串长度)
  //取前8位
  byte[] info_bt = receivefixdata(socket, 8);
  //得到包头信息字符长度
  int info_length = getpacketlength(info_bt);
  //提取包头信息,(文件名 + 文件大小 的字符串长度)
  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
  //开始接收文件
  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>
 /// 得到文件路径(防止有文件名重复)
 /// 如:aaa.txt已经在directory目录下存在,则会得到文件aaa(1).txt
 /// </summary>
 /// <param name="directory">目录名</param>
 /// <param name="file">文件名</param>
 /// <returns>文件路径</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发送数据
 /// <summary>
 /// 发送固定长度消息
 /// 发送字节数不能大于int型最大值
 /// </summary>
 /// <param name="socket"></param>
 /// <param name="msg"></param>
 /// <returns>返回发送字节个数</returns>
 public static int sendfixdata(socket socket, byte[] msg)
 {
  int size = msg.length; //要发送字节长度
  int offset = 0;     //已经发送长度
  int dataleft = size;  //剩下字符
  int senddata = m_maxpacket; //每次发送大小
  while (true)
  {
   //如过剩下的字节数 小于 每次发送字节数
   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>
 /// 发送变长信息 格式 包头(包头占8位) + 正文
 /// </summary>
 /// <param name="socket"></param>
 /// <param name="contact">发送文本</param>
 /// <returns></returns>
 public static int sendvardata(socket socket, string contact)
 {
  //得到字符长度
  int size = system.text.encoding.utf8.getbytes(contact).length;
  //包头字符
  string length = getsendpacketlengthstr(size);
  //包头 + 正文
  byte[] sendbyte = system.text.encoding.utf8.getbytes(length + contact);
  //发送
  return sendfixdata(socket, sendbyte);
 }
 /// <summary>
 /// 发送变成信息
 /// </summary>
 /// <param name="socket"></param>
 /// <param name="bytes"></param>
 /// <returns></returns>
 public static int sendvardata(socket socket, byte[] bytes)
 {
  //得到包头字节
  int size = bytes.length;
  string length = getsendpacketlengthstr(size);
  byte[] lengthbyte = system.text.encoding.utf8.getbytes(length);
  //发送包头
  sendfixdata(socket, lengthbyte);  //因为不知道正文是什么编码所以没有合并
  //发送正文
  return sendfixdata(socket, bytes);
 }
 /// <summary>
 /// 发送t类型对象,序列化
 /// </summary>
 /// <typeparam name="t">t类型</typeparam>
 /// <param name="socket"></param>
 /// <param name="obj">t类型对象,必须是可序列化的</param>
 /// <returns></returns>
 public static int sendserializeobject<t>(socket socket, t obj)
 {
  byte[] bytes = serializeobject(obj);
  return sendvardata(socket, bytes);
 }
 /// <summary>
 /// 发送文件
 /// </summary>
 /// <param name="socket">socket对象</param>
 /// <param name="path">文件路径</param>
 /// <param name="issend">是否发送文件(头)信息,如果当前知道文件[大小,名称]则为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;
   //发送文件信息
   if (issend)
   {
    sendvardata(socket, filename + "|" + length);
   }
   //发送文件
   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;
    //循环读取发送
    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); //设置等待时间,以免粘包
    }
   }
  }
  return ret;
 }
 /// <summary>
 /// 发送文件,不需要进度信息
 /// </summary>
 /// <param name="socket">socket对象</param>
 /// <param name="path">文件路径</param>
 /// <param name="issend">是否发生(头)信息</param>
 /// <returns></returns>
 public static bool sendfile(socket socket, string path,bool issend)
 {
  return sendfile(socket, path, issend, null);
 }
 /// <summary>
 /// 发送文件,不需要进度信息和(头)信息
 /// </summary>
 /// <param name="socket">socket对象</param>
 /// <param name="path">文件路径</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的长度
  return length.substring(0, 8); //截取前前8位
 }
 #endregion
 #region networkstream接收数据
 //没写
 #endregion
 #region networkstream发送数据
 //没写
 #endregion
}

sendfixdata(socket,"01");

receivefixdata(socket,2); //size 就为2

string txt = ????  //不知道有多少字符

sendvardata(socket,txt); //有重载版

receivevardata(socket);