TCP心跳包文档

客户端：
C# code
//启动记时器
        public void BeginTheTimer()
        {
            //th_UserLogin();
            //这里只是要一个object类型数据，用它做为下面Timer的参数之一，没有其它意思
            object myobject = (object)7;
            //暂时设定为1秒钟启动一次！
            System.Threading.Timer t = new System.Threading.Timer
            (new System.Threading.TimerCallback(testTheNet), myobject, 1000, 1000);
        }
        //启动监视"已登录用户通信情况"的线程
        public void testTheNet(object myobject) 
        {
            //UserPassport up=new UserPassport();
             Thread sendMyPulseThPro = new Thread(new ThreadStart(delegateSendMyPulse));
            sendMyPulseThPro.Start();
        } 
        
        /// <summary>
        /// 每隔1秒就是要来做这些事情的
        /// </summary>
        public void delegateSendMyPulse()
         {
            loginServer lser = new loginServer();
            Login l = new Login();
            l.Id = lser.MyLogin.Id;
            l.ClientTypeVersion = version;
            l.RequestType = 3;          
            //3是确认联接正常的一个信号（让服务知道它与服务器的联接是正常的）
            loginServer lserver = new loginServer(); 
            //启动一个新线程去发送数据          
            Thread thSendDat2 = new Thread
            (new ParameterizedThreadStart(lserver.delgSendDataMethod));
            thSendDat2.Start(l);
            thSendDat2.IsBackground = true;
            //标记我已经发送出去一次数据了
            longinserver.MyLostTime += 1;
            //如果外发了3次请求暗号后仍不见服务器的回应，则认为客户端已经与服务器断开联系了
            if(longinserver.MyLostTime>=3)
             {
                //停止Timer
                //告诉用户：“你已经与服务器失去联系了…………”
                longinserver.Controls["txtShowMsg"].Text = "You have lost the connect!";
            }
        }

myRegistry[index].no_check_in_count += 1;           
                   
                        if (myRegistry[index].no_check_in_count >= 3)
                        {
                             //this.lblShowMsg.Text = "the student" 
                            //this.lblShowMsg.Text += registry[index].studentID.ToString() 
                            //this.lblShowMsg.Text += "is diaoxianle!";
                            this.txtLogin.Text += "88";
                            //标记该人已经与服务器失去连接了，因为他有连续3次的未到记录存在
                            registry[index].studentID = "";
                            registry[index].StudentName = "";
                            registry[index].StudentIP = "";
                             registry[index].status = 2;      //掉线
                            
                        }
                    }
                }
            }
        } //定时检查在线人目前状态