Allow only one instance

Set max and min window dimensions
Begus001 · May 2, 2022 · 851ae9f · 851ae9f
1 parent c900226
commit 851ae9f
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Showing 2 changed files with 28 additions and 10 deletions.
diff --git a/Topmost/MainWindow.xaml b/Topmost/MainWindow.xaml
@@ -5,7 +5,7 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:Topmost"
         mc:Ignorable="d"
-        Title="Topmost" Height="80" Width="400" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" Closing="Window_Closing" KeyDown="Window_KeyDown">
+        Title="Topmost" Width="400" Height="80" MaxWidth="400" MaxHeight="80" MinWidth="400" MinHeight="80" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" Closing="Window_Closing" KeyDown="Window_KeyDown">
     <Grid>
         <Grid.ColumnDefinitions>
             <ColumnDefinition Width="1*"/>

diff --git a/Topmost/MainWindow.xaml.cs b/Topmost/MainWindow.xaml.cs
@@ -15,7 +15,7 @@ namespace Topmost
 {
     public partial class MainWindow : Window
     {
-        public Version version = new Version("1.0");
+        public Version version = new Version("1.1");
 
         private const int WM_HOTKEY = 0x0312;
         private const long WS_EX_TOPMOST = 0x00000008L;
@@ -70,6 +70,12 @@ public MainWindow()
         {
             InitializeComponent();
 
+            if (checkRunning())
+            {
+                MessageBox.Show("Another instance is already running!", "Instance running", MessageBoxButton.OK, MessageBoxImage.Error);
+                Environment.Exit(0);
+            }
+
             saveFile = Path.Combine(saveDir, "key.txt");
 
             if (!Directory.Exists(saveDir))
@@ -98,6 +104,18 @@ public MainWindow()
             RegisterHotKey(ownHWnd, hotkeyId, mod, key);
         }
 
+        private bool checkRunning()
+        {
+            Process[] procs = Process.GetProcessesByName(Assembly.GetExecutingAssembly().GetName().Name);
+            for (int i = 0; i < procs.Length; i++)
+            {
+                if (procs[i].Id == Process.GetCurrentProcess().Id)
+                    continue;
+                return true;
+            }
+            return false;
+        }
+
         private IntPtr HwndHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
         {
             if (msg == WM_HOTKEY && (int)wParam == hotkeyId)
@@ -373,6 +391,14 @@ private void btCheck_Click(object sender, RoutedEventArgs e)
             checkStateThread.Start();
         }
 
+        private void Window_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Escape)
+                checkState = false;
+
+            updateUI();
+        }
+
         public enum ModifierKey : uint
         {
             ALT = 0x0001,
@@ -580,13 +606,5 @@ public enum VirtualKey : uint
             PA1 = 0xFD,
             OEMClear = 0xFE
         }
-
-        private void Window_KeyDown(object sender, KeyEventArgs e)
-        {
-            if (e.Key == Key.Escape)
-                checkState = false;
-
-            updateUI();
-        }
     }
 }