C# Socke TCP重连操作 

  1 using Newtonsoft.Json;
  2 using System;
  3 using System.Collections.Generic;
  4 using System.ComponentModel;
  5 using System.Data;
  6 using System.Drawing;
  7 using System.Linq;
  8 using System.Net;
  9 using System.Net.Sockets;
 10 using System.Text;
 11 using System.Threading;
 12 using System.Threading.Tasks;
 13 using System.Windows.Forms;
 14 
 15 namespace WindowsFormsApp52
 16 {
 17     public partial class Form1 : Form
 18     {
 19         public Form1()
 20         {
 21             InitializeComponent();
 22         }
 23 
 24         private static int flag = 0;
 25         System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
 26         static Socket client = null;
 27         static IPAddress ip = IPAddress.Parse("127.0.0.1");
 28         static int port = 7000;
 29         static IPEndPoint ipe = new IPEndPoint(ip, port);
 30 
 31         private void Button1_Click(object sender, EventArgs e)
 32         {
 33             // 启动定时器检测连接
 34             timer.Enabled = true;
 35             timer.Interval = 5000;
 36             timer.Tick += Timer_Tick;
 37 
 38         }
 39         private bool IsSocketConnected(Socket client, IPEndPoint ipe)
 40         {
 41             bool blockingState = client.Blocking;
 42 
 43             try
 44             {
 45 
 46                 string tmpstr = "1";
 47                 byte[] data = Encoding.ASCII.GetBytes(tmpstr);
 48                 client.Blocking = false;
 49 
 50                 try
 51                 {
 52                     int ii = client.Send(data, data.Length, 0);
 53                     if (ii > 0)
 54                         return true;
 55                     else
 56                         return false;
 57 
 58                 }
 59                 catch (Exception ex)
 60                 {
 61                     flag = (int)SocketStatus.Close;
 62                     client.Close();
 63                     return false;
 64                 }
 65 
 66             }
 67             catch (SocketException e)
 68             {
 69                 // 产生 10035 == WSAEWOULDBLOCK 错误，说明被阻止了，但是还是连接的
 70                 if (e.NativeErrorCode.Equals(10035))
 71                     return false;
 72                 else
 73                     return false;
 74             }
 75             finally
 76             {
 77                 client.Blocking = blockingState;    // 恢复状态
 78             }
 79         }
 80         private void Timer_Tick(object sender, EventArgs e)
 81         {
 82             if (client == null)
 83             {
 84                 client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 85                 try
 86                 {
 87                     client.Connect(ipe);
 88                 }
 89                 catch (Exception)
 90                 {
 91                 }
 92 
 93             }
 94             if (flag != (int)SocketStatus.Start && flag == (int)SocketStatus.Close)
 95             {
 96                 client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 97                 try
 98                 {
 99                     client.Connect(ipe);
100                 }
101                 catch (Exception)
102                 { }
103                 flag = (int)SocketStatus.Other;
104             }
105 
106             try
107             {
108                 if (IsSocketConnected(client, ipe))
109                 {
110                     label2.Text = "已连接";
111 
112                     //执行发送TCP的数据处理
113                     SendMes();
114 
115                 }
116                 else
117                 {
118                     label2.Text = "未连接";
119                 }
120 
121             }
122             catch (Exception)
123             {
124                 label2.Text = "未连接";
125             }
126         }
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace WindowsFormsApp52
 8 {
 9    public class Status
10     {
11     }
12 
13     public enum SocketStatus
14     {
15         /// <summary>
16         /// 程序启动时
17         /// </summary>
18         Start,
19         /// <summary>
20         /// Socket连接断开
21         /// </summary>
22         Close,
23         /// <summary>
24         /// 其他
25         /// </summary>
26         Other
27 
28     }
29 }

 

posted @ 2022-10-02 01:23  yun5  阅读(38)  评论(0)    收藏  举报
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