【初学者求教】Socket编程

[OROCHIORI579]

发送数据出去了，但是没有收到数据，暂时先不考虑我发送的格式是否正确，只是请大家帮忙看下除了发送数据部分，其他部分写的是否正确（关键是本地绑定的IP和端口和目标地址和端口这样写有没有冲突），代码如下—>

using System.Net;
using System.Net.Sockets;

namespace BACnetClient
{
    public partial class Form1 : Form
    {
        Socket bacnet_master_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("219.142.59.82"), 5022);//目标端口

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            IPEndPoint local_ipep = new IPEndPoint(IPAddress.Parse("192.168.0.24"), 5022);// 绑定端口，192.168.0.24为本地IP
            
            bacnet_master_socket.Bind(local_ipep);
            bacnet_master_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
        }

        private void btn_Device_FirmwareRevision_Click(object sender, EventArgs e)
        {
            /***************发送*********************************/
            byte[] data = new byte[1024];
            data[0] = Convert.ToByte('L');
            data[1] = Convert.ToByte('R');
            data[2] = Convert.ToByte('|');
            data[3] = Convert.ToByte('R');
            data[4] = Convert.ToByte('I');
            data[5] = Convert.ToByte('G');
            data[6] = Convert.ToByte('I');
            data[7] = Convert.ToByte('|');
            data[8] = Convert.ToByte('F');
            data[9] = Convert.ToByte('L');
            data[10] = Convert.ToByte('R');
            data[11] = Convert.ToByte('N');
            data[12] = Convert.ToByte('G');
            data[13] = Convert.ToByte('#');
            data[14] = Convert.ToByte('G');
            data[15] = Convert.ToByte('N');
            data[16] = Convert.ToByte('G');
            data[17] = Convert.ToByte('L');
            data[18] = Convert.ToByte('G');
            data[19] = Convert.ToByte('V');
            data[20] = Convert.ToByte('G');
            data[21] = Convert.ToByte('G');
            data[22] = Convert.ToByte('G');
            data[23] = Convert.ToByte('S');
            data[24] = Convert.ToByte('S');
            data[25] = Convert.ToByte('F');
            data[26] = Convert.ToByte('|');

            try
            {
                bacnet_master_socket.SendTo(data, (int)27, SocketFlags.None, ipep);
            }
            catch (SocketException)
            {
                System.Windows.Forms.MessageBox.Show("Either the network cable is unplugged, or there is no configured Ethernet Port on this computer");
                return;
            }

            /********************************接收***************************************/
            byte[] received = new byte[1024];
            //int recv = bacnet_master_socket.ReceiveFrom(received, ref tmpRemote);
            int recv = bacnet_master_socket.Receive(received);

            /********************************************接收******************************************/
            string result = "";//设置断点

            System.Windows.Forms.MessageBox.Show(result);
        }
    }
}

希望高手指点，万分感激！！！！！

[ztenv]

先抓包看看有没有发到网络上吧：Wireshark很好用的工具

[OROCHIORI580]

[Quote=引用 1 楼 lianshaohua 的回复:]
先抓包看看有没有发到网络上吧：Wireshark很好用的工具
[/Quote]
下载了 不太会用 我现在想知道链接没连接上 应该如何判断

[皇城龙三]

应该先测试一下链路的状况

可以用c#来实现ping的方法进行测试

public string sPing(string IP)
        {        
            Ping pingSender = new Ping();
            PingOptions options = new PingOptions();
            options.DontFragment = true;
            string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
            byte[] buffer = Encoding.ASCII.GetBytes(data);
            int timeout = 1200;
           
            PingReply reply = pingSender.Send(IP, timeout, buffer, options);
            if (reply.Status == IPStatus.Success)
            {
               

                string sPing;
               
                sPing = "网络正常";

               
               return sPing;

            
            }
            else
            {
                return "网络不通";
               
            }

            
          
        

        }

[捷哥1999]

            try
            {
                //在发送之前首先要连接的！
                bacnet_master_socket.Connect(ipep);
                if(bacnet_master_socket.Connected)
                    bacnet_master_socket.SendTo(data, (int)27, SocketFlags.None, ipep);
            }

[a124819202]

借宝地问个问题！
心跳任务是干什么用的？ 是不是要在开个线程用于保持心跳

[wuyq11]

byte[] buffer = new byte[1024];
socket.Receive(buffer);
处理客户端的请求并回应客户端
string message = "";
byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(message.ToCharArray());
socket.Send(outbytes, message.Length, 0);

SOCKET通讯总结

[OROCHIORI578]

先回家了

[OROCHIORI579]

感谢各位回帖！