adding single instance support

changbowen · Jan 3, 2017 · cc03297 · cc03297
1 parent 5597733
commit cc03297
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Showing 6 changed files with 60 additions and 14 deletions.
diff --git a/App.xaml.cs b/App.xaml.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Runtime.InteropServices;
 //using System.Collections.Generic;
 //using System.Configuration;
 //using System.Data;
@@ -13,12 +14,20 @@ public partial class App : Application
         public static MainWindow mainwin;
         public static Win_Format fb;
         internal const int MaxWindowCount = 2;//need to set this to 4 while debugging if you use live debug toolbar in vs2015.
+        public const string MutexString = @"{39622D35-176E-453D-B1FD-E4EC1EAF31DC}";
 
-        [System.Runtime.InteropServices.DllImport("shlwapi.dll")]
+        [DllImport("shlwapi.dll")]
         private static extern bool PathIsNetworkPath(string pszPath);
 
         private void RunCheck(object sender1, StartupEventArgs e1)
         {
+            if (SingleInstance.CheckExist(MutexString))
+            {asdfasfasdf
+                SingleInstance.SendNotifyMessage(SingleInstance.HWND_BROADCAST, SingleInstance.RegisteredMsg, IntPtr.Zero, IntPtr.Zero);
+                Current.Shutdown();
+                return;
+            }
+
             AppDomain.CurrentDomain.AssemblyResolve += (object sender, ResolveEventArgs e) =>
               {
                   var desiredAssembly = new System.Reflection.AssemblyName(e.Name).Name;
@@ -74,13 +83,6 @@ private void RunCheck(object sender1, StartupEventArgs e1)
                 return;
             }
 
-            if (System.Diagnostics.Process.GetProcessesByName(System.Diagnostics.Process.GetCurrentProcess().ProcessName).Length > 1)
-            {
-                MessageBox.Show((string)Resources["msgbox_one_inst"], "", MessageBoxButton.OK, MessageBoxImage.Exclamation);
-                Current.Shutdown();
-                return;
-            }
-
             mainwin = new MainWindow();
             Current.MainWindow = mainwin;
             mainwin.Show();

diff --git a/DesktopNote.csproj b/DesktopNote.csproj
@@ -65,6 +65,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="SingleInstance.cs" />
     <Compile Include="Win_Format.xaml.cs">
       <DependentUpon>Win_Format.xaml</DependentUpon>
     </Compile>

diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
@@ -18,8 +18,7 @@ public partial class MainWindow : Window
         private object Lock_Save = new object();
         private static int CountDown = 0;
         Point mousepos;
-        private bool fbopen = false;
-
+
         public MainWindow()
         {
             InitializeComponent();
@@ -249,7 +248,6 @@ private void RTB_Main_LostKeyboardFocus(object sender, KeyboardFocusChangedEvent
 
         private void RTB_Main_ContextMenuOpening(object sender, ContextMenuEventArgs e)
         {
-            fbopen = true;
             e.Handled = true;
             if (!RTB_Main.Selection.IsEmpty)
             {
@@ -284,7 +282,6 @@ private void RTB_Main_PreviewMouseDown(object sender, MouseButtonEventArgs e)
         {
             if (e.ChangedButton == MouseButton.Left && App.fb?.Opacity == 1)
             {
-                fbopen = false;
                 App.fb.FadeOut();
             }
         }
@@ -510,6 +507,18 @@ private void Win_Main_Loaded(object sender, RoutedEventArgs e)
             var task_save = new Thread(SaveNotes);
             task_save.IsBackground = true;
             task_save.Start();
+
+            var source = PresentationSource.FromVisual(this) as System.Windows.Interop.HwndSource;
+            source.AddHook(WndProc);
+        }
+
+        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            if (msg == SingleInstance.RegisteredMsg)
+            {
+                MessageBox.Show("Body text", "Title text", MessageBoxButton.OK, MessageBoxImage.Exclamation);
+            }
+            return IntPtr.Zero;
         }
 
 

diff --git a/Resources/StringResources.en.xaml b/Resources/StringResources.en.xaml
@@ -52,7 +52,7 @@ Program will exit now.</sys:String>
     <sys:String x:Key="tooltip_strikethrough">Strike-through (Ctrl + D)</sys:String>
     <sys:String x:Key="tooltip_underline">Underline (Ctrl + U)</sys:String>
     <sys:String x:Key="tooltip_undo">Undo (Ctrl + Z)</sys:String>
-    <sys:String x:Key="msgbox_one_inst">DesktopNote is already running.</sys:String>
+    <!--<sys:String x:Key="msgbox_one_inst">DesktopNote is already running.</sys:String>-->
     <sys:String x:Key="menu_options">Options</sys:String>
     <sys:String x:Key="label_content_path">Content path</sys:String>
     <sys:String x:Key="label_content_path_txt">Text content path</sys:String>

diff --git a/Resources/StringResources.zh.xaml b/Resources/StringResources.zh.xaml
@@ -52,7 +52,7 @@
     <sys:String x:Key="tooltip_strikethrough">删除线 (Ctrl + D)</sys:String>
     <sys:String x:Key="tooltip_underline">下划线 (Ctrl + U)</sys:String>
     <sys:String x:Key="tooltip_undo">撤销 (Ctrl + Z)</sys:String>
-    <sys:String x:Key="msgbox_one_inst">DesktopNote已经在运行。</sys:String>
+    <!--<sys:String x:Key="msgbox_one_inst">DesktopNote已经在运行。</sys:String>-->
     <sys:String x:Key="menu_options">选项</sys:String>
     <sys:String x:Key="label_content_path">笔记保存路径</sys:String>
     <sys:String x:Key="label_content_path_txt">文本保存路径</sys:String>

diff --git a/SingleInstance.cs b/SingleInstance.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DesktopNote
+{
+    class SingleInstance
+    {
+        public static readonly IntPtr HWND_BROADCAST = (IntPtr)0xffff;
+        public static readonly int RegisteredMsg = RegisterWindowMessage("WM_SHOW_DESKTOPNOTE");
+        //[DllImport("user32")] //not working when ShowInTaskbar set to false.
+        //public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);
+        [DllImport("user32.dll", CharSet = CharSet.Auto)]
+        public static extern bool SendNotifyMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam);
+        [DllImport("user32.dll")]
+        public static extern int RegisterWindowMessage(string message);
+
+        public enum MutexScope { Local, Global }
+
+        /// <summary>
+        /// Return created mutex if the mutex name does not exist. Returns null if the mutex name exists.
+        /// </summary>
+        public static bool CheckExist(string uniquestr, MutexScope scope = MutexScope.Global)
+        {sdrsfsdf
+            bool createdNew;
+            new Mutex(true, scope.ToString() + @"\" + uniquestr, out createdNew);
+            return !createdNew;
+        }
+    }
+}