robospot-camera-finder/MainForm.cs

using System.ComponentModel;
using System.Diagnostics;
using System.Net;
using System.Net.NetworkInformation;
using System.Runtime.CompilerServices;
using System.Web;
using Tmds.MDns;
using Xamarin.Forms;

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();

            bool got_proper_ip = false;
            foreach (var net_interface in NetworkInterface.GetAllNetworkInterfaces())
            {
                IPInterfaceProperties prop = net_interface.GetIPProperties();
                foreach (var ip in prop.UnicastAddresses)
                {
                    if (ip.Address.ToString().StartsWith("10."))
                    {
                        if (ip.IPv4Mask.ToString() == "255.0.0.0")
                        {
                            got_proper_ip = true;
                        }
                    }
                }
            }
            if (!got_proper_ip)
            {
                DialogResult open_netsettings = MessageBox.Show("No Ethernet interface on the 10.0.0.0/8 subnet found. Cameras might not be detected. Do you want to open network settings ?", "Wrong IP configuration", MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1);
                if (open_netsettings == DialogResult.Yes)
                {
                    ProcessStartInfo startInfo = new ProcessStartInfo("NCPA.cpl");
                    startInfo.UseShellExecute = true;

                    Process.Start(startInfo);
                }
            }

            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)
        {
            if (lbMain.SelectedItem != null)
            {
                Form viewer = new StreamViewer(lbMain.GetItemText(lbMain.SelectedItem), lbMain.SelectedValue.ToString());
                viewer.Show();
            }
        }
    }
}