feat: Bring window to front on existing instance app launch (#136)

This sends a socket message to the first instance that it should Initialize the frontend and bring it to front and then destroy the second instance (itself).

Classes/Program.cs

@@ -7,6 +7,8 @@
 using System.IO;
 using System.Net;
 using System.Diagnostics;
+using System.Net.Sockets;
+using System.Text;
 #if !WINDOWS
 using PhotinoNET;
 #else
@@ -58,7 +60,17 @@ static void Main(string[] args) {
             // prevent multiple instances
             var mutex = new Mutex(true, @"Global\RePlays", out var createdNew);
             if (!createdNew) {
-                Logger.WriteLine("RePlays is already running! Exiting the application.");
+                Logger.WriteLine("RePlays is already running! Exiting the application and bringing the other instance to foreground.");
+                try {
+                    using (var sender = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)) {
+                        sender.Connect(new IPEndPoint(IPAddress.Loopback, 3333));
+                        sender.Send(Encoding.UTF8.GetBytes("BringToForeground"));
+                        Logger.WriteLine($"Sent BringToForeground to the other instance");
+                    }
+                }
+                catch (Exception ex) {
+                    Logger.WriteLine($"Socket client exception: {ex.Message}");
+                }
                 return;
             }
 

Classes/frmMain.cs

@@ -9,9 +9,13 @@
 using System.Drawing;
 using System.Globalization;
 using System.IO;
+using System.Net.Sockets;
+using System.Net;
+using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using static RePlays.Utils.Functions;
+using System.Threading;
 
 namespace RePlays {
     public partial class frmMain : Form {
@@ -46,6 +50,9 @@ public frmMain() {
                 RecordingService.Start(typeof(LibObsRecorder));
             }
             GetAudioDevices();
+
+            Thread socketThread = new(StartSocketServer);
+            socketThread.Start();
         }
 
         private void frmMain_Load(object sender, System.EventArgs e) {
@@ -178,7 +185,46 @@ private void frmMain_Resize(object sender, System.EventArgs e) {
             }
         }
 
+        private static void StartSocketServer() {
+            int port = 3333;
+            IPAddress ipAddress = IPAddress.Parse("127.0.0.1");
+            IPEndPoint localEndPoint = new(ipAddress, port);
+            Socket listener = new(ipAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
+
+            try {
+                listener.Bind(localEndPoint);
+                listener.Listen(10);
+
+                while (true) {
+                    Socket handler = listener.Accept();
+                    string message = ReceiveMessage(handler);
+
+                    if (message == "BringToForeground") {
+                        Logger.WriteLine($"Got socket message: {message}");
+                        frmMain.Instance.Invoke((MethodInvoker)(() => frmMain.Instance.InitializeWebView2()));
+                        frmMain.Instance.Invoke((MethodInvoker)(() => frmMain.Instance.ActivateFormAndRestoreWindowState()));
+                    }
+
+                    handler.Shutdown(SocketShutdown.Both);
+                    handler.Close();
+                }
+            }
+            catch (Exception ex) {
+                Logger.WriteLine($"Socket server exception: {ex.Message}");
+            }
+        }
+
+        static string ReceiveMessage(Socket socket) {
+            byte[] buffer = new byte[1024];
+            int bytesRead = socket.Receive(buffer);
+            return Encoding.UTF8.GetString(buffer, 0, bytesRead);
+        }
+
         private void notifyIcon1_DoubleClick(object sender, System.EventArgs e) {
+            ActivateFormAndRestoreWindowState();
+        }
+
+        private void ActivateFormAndRestoreWindowState() {
             this.Activate();
             if (this.WindowState == FormWindowState.Minimized) {
                 this.Opacity = 100;