使用C#进行点对点通讯和文件传输

最近一个项目要用到点对点文件传输，俺就到处找资料写程序，最后终于完成了，为了让别人少走些弯路，俺决定将俺程序中最重要的部分贡献出来，希望对大家有所帮助。
俺的程序分三部分，包括发送部分、接受部分和一个两者共享的通讯基类，这个基类才是俺心血的结晶：）
一、通讯基类
using System;
using System.Net.Sockets;
using System.Net ;
using System.IO ;
using System.Windows.Forms;
using System.Text;
namespace BaseClass
{
     /// <summary>
     /// 传送信息的格式为 给定长度的命令部分+给定长度的命令注释部分+可变长度的长度信息+可变长度的信息部分
     /// </summary>
     public class CommunClass
     {
         public CommunClass()
         {
              //
              // TODO: 在此处添加构造函数逻辑
              //
         }

         /// <summary>
         /// 命令部分的长度
         /// </summary>
          private static readonly int CMDLEN = 50 ;
         /// <summary>
         /// 命令注释部分的长度
         /// </summary>
          private static readonly int DESCLEN = 100 ;
         /// <summary>
         /// 可变长度的长度信息部分所占的字节数
         /// </summary>
          private static readonly int DYNAMICLENGTHLEN = 10 ;
         /// <summary>
         /// 每次处理可变信息部分的长度
         /// </summary>
          private static readonly int DEALLEN = 1024 ;             
         /// <summary>
         /// /应答的最大长度
         /// </summary>
          private static readonly int RESPONLEN = 20 ;
         /// <summary>
         /// 用于填充命令或注释不足长度部分的字符
         /// </summary>    
          private static readonly char FILLCHAR = '^' ;
         /// <summary>
         /// 成功发送一部分数据后的回调方法(也可以认为是触发的事件，但严格来说还不是)
         /// </summary>
          public delegate void OnSend(int iTotal,int iSending) ;
         /// <summary>
         /// 根据给定的服务器和端口号建立连接
         /// </summary>
         /// <param name="strHost">服务器名</param>
         /// <param name="iPort">端口号</param>
         /// <returns></returns>
         public static Socket ConnectToServer(string strHost,int iPort)
         {             
              try 
              {
                   IPAddress ipAddress = Dns.Resolve(strHost).AddressList[0];
                   IPEndPoint ipPoint = new IPEndPoint(ipAddress,iPort) ;
                   Socket s = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp) ;
                   s.Connect(ipPoint) ;
                   return s ;
              } 
              catch (Exception e) 
              {
                   throw (new Exception("建立到服务器的连接出错" + e.Message)) ;
              }
         }
         /// <summary>
         /// 将文本写到Socket中
         /// </summary>
         /// <param name="s">要发送信息的Socket</param>
         /// <param name="strInfo">要发送的信息</param>
         /// <returns>是否成功</returns>
         public static bool WriteTextToSocket(Socket s,string strInfo)
         {
              byte [] buf = Encoding.UTF8.GetBytes(strInfo) ;
              try
              {
                   s.Send(buf,0,buf.Length,SocketFlags.None) ;
                   return true ;
              }
              catch(Exception err)
              {
                   MessageBox.Show("发送文本失败！"+err.Message) ;
                   return false ;
              }
         }
         /// <summary>
         /// 将命令文本写到Socket中
         /// </summary>
         /// <param name="s">要发送命令文本的Socket</param>
         /// <param name="strInfo">要发送的命令文本</param>
         /// <returns>是否成功</returns>
         public static bool WriteCommandToSocket(Socket s,string strCmd)
         {
              if (strCmd == "")
                   strCmd = "NOP" ;
              strCmd = strCmd.PadRight(CMDLEN,FILLCHAR) ;
              return WriteTextToSocket(s,strCmd) ;          
         }
         /// <summary>
         /// 将命令注释写到Socket中
         /// </summary>
         /// <param name="s">要发送命令注释的Socket</param>
         /// <param name="strInfo">要发送的命令注释</param>
         /// <returns>是否成功</returns>
         public static bool WriteCommandDescToSocket(Socket s,string strDesc)
         {
              if (strDesc == "")
                   strDesc = "0" ;
              strDesc = strDesc.PadRight(DESCLEN,FILLCHAR) ;
              return WriteTextToSocket(s,strDesc) ;              
         }
         /// <summary>
         /// 发送可变信息的字节数
         /// </summary>
         /// <param name="s">要发送字节数的Socket</param>
         /// <param name="iLen">字节数</param>
         /// <returns>是否成功</returns>
         public static bool WriteDynamicLenToSocket(Socket s,int iLen)
         {             
              string strLen = iLen.ToString().PadRight(DYNAMICLENGTHLEN,FILLCHAR) ;
              return WriteTextToSocket(s,strLen) ;          
         }
         /// <summary>
         /// 将缓存的指定部分发送到Socket
         /// </summary>
         /// <param name="s">要发送缓存的Socket</param>
         /// <param name="buf">要发送的缓存</param>
         /// <param name="iStart">要发送缓存的起始位置</param>
         /// <param name="iCount">要发送缓存的字节数</param>
         /// <param name="iBlock">每次发送的字节说</param>
         /// <param name="SendSuccess">每次发送成功后的回调函数</param>
         /// <returns>是否发送成功</returns>
         public static bool WriteBufToSocket(Socket s,byte [] buf,int iStart,int iCount,int iBlock,OnSend SendSuccess)
         {    
              int iSended = 0 ;
              int iSending = 0 ;
              while(iSended<iCount)
              {
                   if (iSended + iBlock <= iCount)
                        iSending = iBlock ;
                   else
                        iSending = iCount  iSended ;
                   s.Send(buf,iStart+iSended,iSending,SocketFlags.None) ;                      
                   iSended += iSending ;
                   if (ReadResponsionFromSocket(s)=="OK")
                       if (SendSuccess != null)
                        SendSuccess(iCount,iSended) ;
                   else
                       return false;
              }
             return true ;                       
         }
         /// <summary>
         /// 将长度不固定文本发送到socket
         /// </summary>
         /// <param name="s">要发送文本的Socket</param>
         /// <param name="strText">要发送的文本</param>
         /// <param name="OnSendText">成功发送一部分文本后的回调函数</param>
         /// <param name="settextlen">得到文本长度的回调函数</param>
         /// <returns></returns>
         public static bool WriteDynamicTextToSocket(Socket s,string strText,
              OnSend OnSendText)
         {
              byte [] buf = Encoding.UTF8.GetBytes(strText) ;
              int iLen = buf.Length ;
              try
              {
                   WriteDynamicLenToSocket(s,iLen) ;
                   return WriteBufToSocket(s,buf,0,iLen,DEALLEN,OnSendText) ;
              }
              catch(Exception err)
              {
                   MessageBox.Show("发送文本失败！"+err.Message) ;
                   return false ;
              }
         }
         /// <summary>
         /// 将文件写到Socket
         /// </summary>
         /// <param name="s">要发送文件的Socket</param>
         /// <param name="strFile">要发送的文件</param>
         /// <returns>是否成功</returns>
         public static bool WriteFileToSocket(Socket s,string strFile,
              OnSend OnSendFile)
         {
              FileStream fs = new FileStream(strFile,FileMode.Open,FileAccess.Read,FileShare.Read) ;
              int iLen = (int)fs.Length ;
              WriteDynamicLenToSocket(s,iLen) ;
              byte [] buf = new byte[iLen] ;
              try
              {
                   fs.Read(buf,0,iLen) ;
                   return WriteBufToSocket(s,buf,0,iLen,DEALLEN,OnSendFile) ;
              }
              catch(Exception err)
              {
                   MessageBox.Show("发送文件失败！"+err.Message) ;
                   return false ;
              }
              finally
              {
                   fs.Close() ;
              }              
         }
         /// <summary>
         /// 对方对自己消息的简单回应
         /// </summary>
         /// <param name="s"></param>
         /// <returns></returns>
         public static string ReadResponsionFromSocket( Socket s)
         {
              byte [] bufCmd = new byte[RESPONLEN] ;
              int iCount = s.Receive(bufCmd) ;
              string strRespon = Encoding.UTF8.GetString(bufCmd,0,iCount) ;
              return strRespon ;
         }
         /// <summary>
         /// 从Socket读取命令
         /// </summary>
         /// <param name="s">要读取命令的Socket</param>
         /// <returns>读取的命令</returns>
         public static string ReadCommandFromSocket( Socket s)
         {                  
              byte [] bufCmd = new byte[CMDLEN] ;
              int iCount = s.Receive(bufCmd,0,CMDLEN,SocketFlags.Partial) ;
              string strCommand = Encoding.UTF8.GetString(bufCmd,0,CMDLEN) ;
              return strCommand =  strCommand.TrimEnd(FILLCHAR) ;
         }
         /// <summary>
         /// 读取命令注释
         /// </summary>
         /// <param name="s">要读取命令注释的Socket</param>
         /// <returns>读取的命令注释</returns>
         public static string ReadCommandDescFromSocket( Socket s)
         {                  
              byte [] bufCmd = new byte[DESCLEN] ;
              int iCount = s.Receive(bufCmd,0,DESCLEN,SocketFlags.Partial) ;
              string strCommand = Encoding.UTF8.GetString(bufCmd,0,DESCLEN) ;
              return strCommand =  strCommand.TrimEnd(FILLCHAR) ;
         }
         /// <summary>
         /// 读取可变部分的长度
         /// </summary>
         /// <param name="s">要读取可变部分长度的Socket</param>
         /// <returns>读取的可变部分的长度</returns>
         public static int ReadDynamicLenFromSocket( Socket s)
         {                  
              byte [] bufCmd = new byte[DYNAMICLENGTHLEN] ;
              int iCount = s.Receive(bufCmd,0,DYNAMICLENGTHLEN,SocketFlags.Partial) ;
              string strCommand = Encoding.UTF8.GetString(bufCmd,0,DYNAMICLENGTHLEN) ;
              return int.Parse(strCommand.TrimEnd(FILLCHAR)) ;
         }
         /// <summary>
         /// 读取文本形式的可变信息
         /// </summary>
         /// <param name="s">要读取可变信息的Socket</param>
         /// <returns>读取的可变信息</returns>
         public static string ReadDynamicTextFromSocket( Socket s)
         {             
              int iLen =  ReadDynamicLenFromSocket(s) ;
              byte [] buf = new byte[iLen] ;
              string strInfo = "" ;
              int iReceiveded = 0 ;
              int iReceiveing = 0 ;
              while(iReceiveded<iLen)
              {
                   if (iReceiveded + DEALLEN <= iLen)
                        iReceiveing = DEALLEN ;
                   else
                        iReceiveing = iLen  iReceiveded ;                    
                   s.Receive(buf,iReceiveded,iReceiveing,SocketFlags.None) ;     
                   CommunClass.WriteTextToSocket(s,"OK") ;
                   iReceiveded+= iReceiveing ;
              }
              strInfo = Encoding.UTF8.GetString(buf,0,iLen) ;
              return strInfo ;
         }
         /// <summary>
         /// 读取文件形式的可变信息
         /// </summary>
         /// <param name="s">要读取可变信息的Socket</param>
         /// <param name="strFile">读出后的文件保存位置</param>
         /// <returns>是否读取成功</returns>
         public static bool ReadDynamicFileFromSocket( Socket s,string strFile)
         {             
              int iLen =  ReadDynamicLenFromSocket(s) ;
              byte [] buf = new byte[iLen] ;
              FileStream fs = new FileStream(strFile,FileMode.Create,FileAccess.Write) ;
              try
              {
                   int iReceiveded = 0 ;
                   int iReceiveing = 0 ;
                   while(iReceiveded<iLen)
                   {
                       if (iReceiveded + DEALLEN <= iLen)
                            iReceiveing = DEALLEN ;
                       else
                            iReceiveing = iLen  iReceiveded ;                    
                        s.Receive(buf,iReceiveded,iReceiveing,SocketFlags.None) ;     
                        CommunClass.WriteTextToSocket(s,"OK") ;
                        iReceiveded+= iReceiveing ;
                   }
                   fs.Write(buf,0,iLen) ;
                   return true ;
              }
              catch(Exception err)
              {
                   MessageBox.Show("接收文件失败"+err.Message) ;
                   return false ;
              }
              finally
              {
                   fs.Close() ;
              }              
         }
     }//end class
}//end namespace
上面是俺的通讯基础类，有了这个类，再进行发送接受还不是小菜一碟吗？