robospot-camera-finder/MainForm.cs

using System.ComponentModel;
using System.Net;
using System.Runtime.CompilerServices;
using System.Web;
using Tmds.MDns;

namespace robospot_camera_finder
{
    public partial class MainForm : Form
    {
        private readonly ServiceBrowser browser = new();

        private BindingList<Camera> all_cameras = new();

        class Camera
        {
            private IPAddress ip;
            private string name;

            public Camera(string name, IPAddress ip)
            {
                this.name = name;
                this.ip = ip;
            }

            public string camera_name
            {
                get
                {
                    return name;
                }
            }

            public IPAddress camera_ip
            {
                get
                {
                    return ip;
                }
            }
        }

        public MainForm()
        {
            InitializeComponent();

            browser.StartBrowse("_rtsp._tcp");

            lbMain.DataSource = all_cameras;
            lbMain.DisplayMember = "camera_name";
            lbMain.ValueMember = "camera_ip";

            browser.ServiceAdded += (sender, args) =>
            {
                foreach (var cam_addr in args.Announcement.Addresses)
                {
                    if (cam_addr.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                    {
                        Camera camera = new Camera("Camera " + cam_addr.ToString(), cam_addr);
                        all_cameras.Add(camera);
                    }
                }
            };

            browser.ServiceRemoved += (sender, args) =>
            {
                foreach (var cam_ip in args.Announcement.Addresses)
                {
                    if (cam_ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                    {
                        foreach (var camera in all_cameras)
                        {
                            if (cam_ip == camera.camera_ip)
                            {
                                all_cameras.Remove(camera);
                                return;
                            }
                        }
                    }
                }
            };
        }

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            browser.StopBrowse();
        }

        private void lbMain_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            Form viewer = new StreamViewer(lbMain.GetItemText(lbMain.SelectedItem), lbMain.SelectedValue.ToString());
            viewer.Show();
        }
    }
}