auth

src/MonsterMonitor/Program.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading;
 using System.Windows.Forms;
 using MonsterMonitor.UI;
 
@@ -6,9 +7,21 @@ namespace MonsterMonitor
 {
     internal static class Program
     {
+        private const string SingleInstanceMutexName = @"Global\MonsterMonitor_v2_SingleInstance";
+        private const string ActivateEventName = @"Global\MonsterMonitor_v2_Activate";
+
         [STAThread]
         private static void Main()
         {
+            var createdNew = false;
+            using (var mutex = new Mutex(true, SingleInstanceMutexName, out createdNew))
+            {
+                if (!createdNew)
+                {
+                    TrySignalExistingInstance();
+                    return;
+                }
+
             Application.ThreadException += (sender, args) =>
             {
                 MessageBox.Show(
@@ -29,7 +42,38 @@ namespace MonsterMonitor
 
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
-            Application.Run(new MainForm());
+                using (var activateEvent = new EventWaitHandle(false, EventResetMode.AutoReset, ActivateEventName))
+                {
+                    var form = new MainForm();
+                    ThreadPool.RegisterWaitForSingleObject(
+                        activateEvent,
+                        (state, timedOut) =>
+                        {
+                            var mainForm = state as MainForm;
+                            mainForm?.RestoreAndActivateFromExternalSignal();
+                        },
+                        form,
+                        Timeout.Infinite,
+                        false);
+
+                    Application.Run(form);
+                }
+            }
+        }
+
+        private static void TrySignalExistingInstance()
+        {
+            try
+            {
+                using (var activateEvent = EventWaitHandle.OpenExisting(ActivateEventName))
+                {
+                    activateEvent.Set();
+                }
+            }
+            catch
+            {
+                // Если не удалось отправить сигнал, просто завершаем второй инстанс.
+            }
         }
     }
 }