使用C#进行点对点通讯和文件传输（通讯基类部分）

http://dev.csdn.net/develop/article/32/32158.shtm 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