C#Socket通讯(三)

//回复答应添加好友 
                    if (_str.StartsWith("Find::AddFriendYes")) 
                    { 
                        string UserName = _str.Substring("Find::AddFriendYes".Length, _str.Length - "Find::AddFriendYes".Length); 
                      //// 保存数据 
                        DataTable TabmyFriend = new DataTable() ; 
                        //保存该用户 
                        TabmyFriend.ReadXml(MyPath + "\\UserFriend\\" + obj as string + ".xml"); 
                        DataRow newRow = TabmyFriend.NewRow(); 
                        newRow["UserName"] = UserName; 
                        TabmyFriend.Rows.Add(newRow); 
                        TabmyFriend.WriteXml(MyPath + "\\UserFriend\\" + obj as string + ".xml", XmlWriteMode.WriteSchema, false); 
                        //保存其好友 
                        TabmyFriend = new DataTable(); 
                        TabmyFriend.ReadXml(MyPath + "\\UserFriend\\" + UserName + ".xml"); 
                        DataRow newRow1 = TabmyFriend.NewRow(); 
                        newRow1["UserName"] = obj as string; 
                        TabmyFriend.Rows.Add(newRow1); 
                        TabmyFriend.WriteXml(MyPath + "\\UserFriend\\" + UserName + ".xml", XmlWriteMode.WriteSchema, false); 
                        TabmyFriend = null; 
                        SerializeFriendList(obj, clientSkt);

//"开始"按钮事件 

private void button1_Click(object sender, System.EventArgs e) { 

   //取得预保存的文件名 

   string fileName=textBox3.Text.Trim(); 

   //远程主机 

   string hostName=textBox1.Text.Trim(); 

   //端口 

   int port=Int32.Parse(textBox2.Text.Trim()); 

   //得到主机信息 

   IPHostEntry ipInfo=Dns.GetHostByName(hostName); 

   //取得IPAddress[] 

   IPAddress[] ipAddr=ipInfo.AddressList; 

   //得到ip 

   IPAddress ip=ipAddr[0]; 

   //组合出远程终结点 

   IPEndPoint hostEP=new IPEndPoint(ip,port); 

   //创建Socket 实例 

   Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); 

   try 

   { 

   //尝试连接 

   socket.Connect(hostEP); 

   } 

   catch(Exception se) 

   { 

   MessageBox.Show("连接错误"+se.Message,"提示信息 

   ,MessageBoxButtons.RetryCancel,MessageBoxIcon.Information); 

} 

//发送给远程主机的请求内容串 

string sendStr="GET / HTTP/1.1\r\nHost: " + hostName + 

"\r\nConnection: Close\r\n\r\n"; 

   //创建bytes字节数组以转换发送串 

   byte[] bytesSendStr=new byte[1024]; 

   //将发送内容字符串转换成字节byte数组 

   bytesSendStr=Encoding.ASCII.GetBytes(sendStr); 

try 

{ 

//向主机发送请求 

socket.Send(bytesSendStr,bytesSendStr.Length,0); 

} 

catch(Exception ce) 

   { 

   MessageBox.Show("发送错误:"+ce.Message,"提示信息 

   ,MessageBoxButtons.RetryCancel,MessageBoxIcon.Information); 

   } 

   //声明接收返回内容的字符串 

   string recvStr=""; 

   //声明字节数组，一次接收数据的长度为1024字节 

   byte[] recvBytes=new byte[1024]; 

   //返回实际接收内容的字节数 

   int bytes=0; 

//循环读取，直到接收完所有数据 

while(true) 

{ 

bytes=socket.Receive(recvBytes,recvBytes.Length,0); 

//读取完成后退出循环 

if(bytes〈=0) 

break; 

//将读取的字节数转换为字符串 

recvStr+=Encoding.ASCII.GetString(recvBytes,0,bytes); 

} 

//将所读取的字符串转换为字节数组 

byte[] content=Encoding.ASCII.GetBytes(recvStr); 

   try 

   { 

   //创建文件流对象实例 

   FileStream fs=new FileStream(fileName,FileMode.OpenOrCreate,FileAccess.ReadWrite); 

//写入文件 

fs.Write(content,0,content.Length); 

} 

catch(Exception fe) 

   { 

   MessageBox.Show("文件创建/写入错误:"+fe.Message,"提示信息",MessageBoxButtons.RetryCancel,MessageBoxIcon.Information); 

   } 

   //禁用Socket 

   socket.Shutdown(SocketShutdown.Both); 

   //关闭Socket 

   socket.Close(); 

   } 

   }