Add unmodified Medo SingleInstance https://github.com/medo64/Medo/blob/main/src/Medo/Application/SingleInstance.cs

ILSpy.Tests/CommandLineArgumentsTests.cs

@@ -2,6 +2,8 @@
 
 using FluentAssertions;
 
+using ICSharpCode.ILSpy.AppEnv;
+
 using NUnit.Framework;
 
 namespace ICSharpCode.ILSpy.Tests

ILSpy/App.xaml.cs

@@ -35,6 +35,8 @@ using ICSharpCode.ILSpy.Options;
 using ICSharpCode.ILSpyX.Analyzers;
 using ICSharpCode.ILSpyX.Settings;
 
+using Medo.Application;
+
 using Microsoft.VisualStudio.Composition;
 
 using TomsToolbox.Wpf.Styles;
@@ -69,7 +71,8 @@ namespace ICSharpCode.ILSpy
 				&& !MiscSettingsPanel.CurrentMiscSettings.AllowMultipleInstances;
 			if (forceSingleInstance)
 			{
-				SingleInstanceHandling.ForceSingleInstance(cmdArgs);
+				SingleInstance.Attach();  // will auto-exit for second instance
+				SingleInstance.NewInstanceDetected += SingleInstance_NewInstanceDetected;
 			}
 
 			InitializeComponent();
@@ -101,6 +104,17 @@ namespace ICSharpCode.ILSpy
 			}
 		}
 
+		private static void SingleInstance_NewInstanceDetected(object? sender, NewInstanceEventArgs e)
+		{
+			var mainWindow = ICSharpCode.ILSpy.MainWindow.Instance;
+
+			var args = new CommandLineArguments(e.Args);
+			if (mainWindow.HandleCommandLineArguments(args))
+			{
+				mainWindow.HandleCommandLineArgumentsAfterShowList(args);
+			}
+		}
+
 		static Assembly ResolvePluginDependencies(AssemblyLoadContext context, AssemblyName assemblyName)
 		{
 			var rootPath = Path.GetDirectoryName(typeof(App).Assembly.Location);

ILSpy/AppEnv/CommandLineTools.cs

@@ -18,6 +18,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Text;
 
 namespace ICSharpCode.ILSpy.AppEnv
@@ -110,6 +111,26 @@ namespace ICSharpCode.ILSpy.AppEnv
 				b.Append('"');
 			}
 		}
+
+		public static string FullyQualifyPath(string argument)
+		{
+			// Fully qualify the paths before passing them to another process,
+			// because that process might use a different current directory.
+			if (string.IsNullOrEmpty(argument) || argument[0] == '-')
+				return argument;
+			try
+			{
+				if (argument.StartsWith("@"))
+				{
+					return "@" + FullyQualifyPath(argument.Substring(1));
+				}
+				return Path.Combine(Environment.CurrentDirectory, argument);
+			}
+			catch (ArgumentException)
+			{
+				return argument;
+			}
+		}
 	}
 
 	// Source: https://github.com/dotnet/runtime/blob/bc9fc5a774d96f95abe0ea5c90fac48b38ed2e67/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Unix.cs#L574-L606

ILSpy/AppEnv/SingleInstance.cs

@@ -0,0 +1,290 @@
+// Source: https://github.com/medo64/Medo/blob/main/src/Medo/Application/SingleInstance.cs
+
+/* Josip Medved <jmedved@jmedved.com> * www.medo64.com * MIT License */
+
+//2022-12-01: Compatible with .NET 6 and 7
+//2012-11-24: Suppressing bogus CA5122 warning (http://connect.microsoft.com/VisualStudio/feedback/details/729254/bogus-ca5122-warning-about-p-invoke-declarations-should-not-be-safe-critical)
+//2010-10-07: Added IsOtherInstanceRunning method
+//2008-11-14: Reworked code to use SafeHandle
+//2008-04-11: Cleaned code to match FxCop 1.36 beta 2 (SpecifyMarshalingForPInvokeStringArguments, NestedTypesShouldNotBeVisible)
+//2008-04-10: NewInstanceEventArgs is not nested class anymore
+//2008-01-26: AutoExit parameter changed to NoAutoExit
+//2008-01-08: Main method is now called Attach
+//2008-01-06: System.Environment.Exit returns E_ABORT (0x80004004)
+//2008-01-03: Added Resources
+//2007-12-29: New version
+
+namespace Medo.Application;
+
+using System;
+using System.Diagnostics;
+using System.IO.Pipes;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Threading;
+
+/// <summary>
+/// Handles detection and communication of programs multiple instances.
+/// This class is thread safe.
+/// </summary>
+public static class SingleInstance
+{
+
+	private static Mutex? _mtxFirstInstance;
+	private static Thread? _thread;
+	private static readonly object _syncRoot = new();
+
+
+	/// <summary>
+	/// Returns true if this application is not already started.
+	/// Another instance is contacted via named pipe.
+	/// </summary>
+	/// <exception cref="InvalidOperationException">API call failed.</exception>
+	public static bool Attach()
+	{
+		return Attach(false);
+	}
+
+	/// <summary>
+	/// Returns true if this application is not already started.
+	/// Another instance is contacted via named pipe.
+	/// </summary>
+	/// <param name="noAutoExit">If true, application will exit after informing another instance.</param>
+	/// <exception cref="InvalidOperationException">API call failed.</exception>
+	public static bool Attach(bool noAutoExit)
+	{
+		lock (_syncRoot)
+		{
+			var isFirstInstance = false;
+			try
+			{
+				_mtxFirstInstance = new Mutex(initiallyOwned: true, @"Global\" + MutexName, out isFirstInstance);
+				if (isFirstInstance == false)
+				{ //we need to contact previous instance
+					var contentObject = new SingleInstanceArguments() {
+						CommandLine = Environment.CommandLine,
+						CommandLineArgs = Environment.GetCommandLineArgs(),
+					};
+					var contentBytes = JsonSerializer.SerializeToUtf8Bytes(contentObject);
+					using var clientPipe = new NamedPipeClientStream(".",
+																	 MutexName,
+																	 PipeDirection.Out,
+																	 PipeOptions.CurrentUserOnly | PipeOptions.WriteThrough);
+					clientPipe.Connect();
+					clientPipe.Write(contentBytes, 0, contentBytes.Length);
+				}
+				else
+				{  //there is no application already running.
+					_thread = new Thread(Run) {
+						Name = typeof(SingleInstance).FullName,
+						IsBackground = true
+					};
+					_thread.Start();
+				}
+			}
+			catch (Exception ex)
+			{
+				Trace.TraceWarning(ex.Message + "  {Medo.Application.SingleInstance}");
+			}
+
+			if ((isFirstInstance == false) && (noAutoExit == false))
+			{
+				Trace.TraceInformation("Exit due to another instance running." + " [" + nameof(SingleInstance) + "]");
+				if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+				{
+					Environment.Exit(unchecked((int)0x80004004));  // E_ABORT(0x80004004)
+				}
+				else
+				{
+					Environment.Exit(114);  // EALREADY(114)
+				}
+			}
+
+			return isFirstInstance;
+		}
+	}
+
+	private static string? _mutexName;
+	private static string MutexName {
+		get {
+			lock (_syncRoot)
+			{
+				if (_mutexName == null)
+				{
+					var assembly = Assembly.GetEntryAssembly();
+
+					var sbMutextName = new StringBuilder();
+					var assName = assembly?.GetName().Name;
+					if (assName != null)
+					{
+						sbMutextName.Append(assName, 0, Math.Min(assName.Length, 31));
+						sbMutextName.Append('.');
+					}
+
+					var sbHash = new StringBuilder();
+					sbHash.AppendLine(Environment.MachineName);
+					sbHash.AppendLine(Environment.UserName);
+					if (assembly != null)
+					{
+						sbHash.AppendLine(assembly.FullName);
+						sbHash.AppendLine(assembly.Location);
+					}
+					else
+					{
+						var args = Environment.GetCommandLineArgs();
+						if (args.Length > 0)
+						{ sbHash.AppendLine(args[0]); }
+					}
+					foreach (var b in SHA256.HashData(Encoding.UTF8.GetBytes(sbHash.ToString())))
+					{
+						if (sbMutextName.Length == 63)
+						{ sbMutextName.AppendFormat("{0:X1}", b >> 4); }  // just take the first nubble
+						if (sbMutextName.Length == 64)
+						{ break; }
+						sbMutextName.AppendFormat("{0:X2}", b);
+					}
+					_mutexName = sbMutextName.ToString();
+				}
+				return _mutexName;
+			}
+		}
+	}
+
+	/// <summary>
+	/// Gets whether there is another instance running.
+	/// It temporary creates mutex.
+	/// </summary>
+	public static bool IsOtherInstanceRunning {
+		get {
+			lock (_syncRoot)
+			{
+				if (_mtxFirstInstance != null)
+				{
+					return false; //no other instance is running
+				}
+				else
+				{
+					var tempInstance = new Mutex(true, MutexName, out var isFirstInstance);
+					tempInstance.Close();
+					return (isFirstInstance == false);
+				}
+			}
+		}
+	}
+
+	/// <summary>
+	/// Occurs in first instance when new instance is detected.
+	/// </summary>
+	public static event EventHandler<NewInstanceEventArgs>? NewInstanceDetected;
+
+
+	/// <summary>
+	/// Thread function.
+	/// </summary>
+	private static void Run()
+	{
+		using var serverPipe = new NamedPipeServerStream(MutexName,
+														 PipeDirection.In,
+														 maxNumberOfServerInstances: 1,
+														 PipeTransmissionMode.Byte,
+														 PipeOptions.CurrentUserOnly | PipeOptions.WriteThrough);
+		while (_mtxFirstInstance != null)
+		{
+			try
+			{
+				if (!serverPipe.IsConnected)
+				{ serverPipe.WaitForConnection(); }
+				var contentObject = JsonSerializer.Deserialize<SingleInstanceArguments>(serverPipe);
+				serverPipe.Disconnect();
+				if (contentObject != null)
+				{
+					NewInstanceDetected?.Invoke(null,
+												new NewInstanceEventArgs(
+													contentObject.CommandLine,
+													contentObject.CommandLineArgs));
+				}
+			}
+			catch (Exception ex)
+			{
+				Trace.TraceWarning(ex.Message + " [" + nameof(SingleInstance) + "]");
+				Thread.Sleep(100);
+			}
+		}
+	}
+
+
+	[Serializable]
+	private sealed record SingleInstanceArguments
+	{  // just a storage
+#if NET7_0_OR_GREATER
+		[JsonInclude]
+		public required string CommandLine;
+
+		[JsonInclude]
+		public required string[] CommandLineArgs;
+#else
+		public SingleInstanceArguments() {
+			CommandLine = string.Empty;
+			CommandLineArgs = Array.Empty<string>();
+		}
+
+		[JsonInclude]
+		public string CommandLine;
+
+		[JsonInclude]
+		public string[] CommandLineArgs;
+#endif
+	}
+
+}
+
+
+/// <summary>
+/// Arguments for newly detected application instance.
+/// </summary>
+public sealed class NewInstanceEventArgs : EventArgs
+{
+	/// <summary>
+	/// Creates new instance.
+	/// </summary>
+	/// <param name="commandLine">Command line.</param>
+	/// <param name="commandLineArgs">String array containing the command line arguments in the same format as Environment.GetCommandLineArgs.</param>
+	internal NewInstanceEventArgs(string commandLine, string[] commandLineArgs)
+	{
+		CommandLine = commandLine;
+		_commandLineArgs = new string[commandLineArgs.Length];
+		Array.Copy(commandLineArgs, _commandLineArgs, _commandLineArgs.Length);
+	}
+
+	/// <summary>
+	/// Gets the command line.
+	/// </summary>
+	public string CommandLine { get; }
+
+	private readonly string[] _commandLineArgs;
+	/// <summary>
+	/// Returns a string array containing the command line arguments.
+	/// </summary>
+	public string[] GetCommandLineArgs()
+	{
+		var argCopy = new string[_commandLineArgs.Length];
+		Array.Copy(_commandLineArgs, argCopy, argCopy.Length);
+		return argCopy;
+	}
+
+	/// <summary>
+	/// Gets a string array containing the command line arguments without the name of exectuable.
+	/// </summary>
+	public string[] Args {
+		get {
+			var argCopy = new string[_commandLineArgs.Length - 1];
+			Array.Copy(_commandLineArgs, 1, argCopy, 0, argCopy.Length);
+			return argCopy;
+		}
+	}
+
+}

ILSpy/MainWindow.xaml.cs

@@ -600,12 +600,7 @@ namespace ICSharpCode.ILSpy
 		{
 			base.OnSourceInitialized(e);
 			PresentationSource source = PresentationSource.FromVisual(this);
-			HwndSource hwndSource = source as HwndSource;
-			if (hwndSource != null)
-			{
-				hwndSource.AddHook(WndProc);
-			}
-			SingleInstanceHandling.ReleaseSingleInstanceMutex();
+
 			// Validate and Set Window Bounds
 			Rect bounds = Rect.Transform(sessionSettings.WindowBounds, source.CompositionTarget.TransformToDevice);
 			var boundsRect = new System.Drawing.Rectangle((int)bounds.Left, (int)bounds.Top, (int)bounds.Width, (int)bounds.Height);
@@ -624,35 +619,6 @@ namespace ICSharpCode.ILSpy
 			this.WindowState = sessionSettings.WindowState;
 		}
 
-		unsafe IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
-		{
-			if (msg == NativeMethods.WM_COPYDATA)
-			{
-				CopyDataStruct* copyData = (CopyDataStruct*)lParam;
-				string data = new string((char*)copyData->Buffer, 0, copyData->Size / sizeof(char));
-				if (data.StartsWith("ILSpy:\r\n", StringComparison.Ordinal))
-				{
-					data = data.Substring(8);
-					List<string> lines = new List<string>();
-					using (StringReader r = new StringReader(data))
-					{
-						string line;
-						while ((line = r.ReadLine()) != null)
-							lines.Add(line);
-					}
-					var args = new CommandLineArguments(lines);
-					if (HandleCommandLineArguments(args))
-					{
-						if (!args.NoActivate && WindowState == WindowState.Minimized)
-							WindowState = WindowState.Normal;
-						HandleCommandLineArgumentsAfterShowList(args);
-						handled = true;
-						return (IntPtr)1;
-					}
-				}
-			}
-			return IntPtr.Zero;
-		}
 		#endregion
 
 		protected override void OnKeyDown(KeyEventArgs e)
@@ -686,7 +652,7 @@ namespace ICSharpCode.ILSpy
 
 		List<LoadedAssembly> commandLineLoadedAssemblies = new List<LoadedAssembly>();
 
-		bool HandleCommandLineArguments(CommandLineArguments args)
+		internal bool HandleCommandLineArguments(CommandLineArguments args)
 		{
 			LoadAssemblies(args.AssembliesToLoad, commandLineLoadedAssemblies, focusNode: false);
 			if (args.Language != null)
@@ -698,7 +664,7 @@ namespace ICSharpCode.ILSpy
 		/// Called on startup or when passed arguments via WndProc from a second instance.
 		/// In the format case, spySettings is non-null; in the latter it is null.
 		/// </summary>
-		void HandleCommandLineArgumentsAfterShowList(CommandLineArguments args, ILSpySettings spySettings = null)
+		internal void HandleCommandLineArgumentsAfterShowList(CommandLineArguments args, ILSpySettings spySettings = null)
 		{
 			var relevantAssemblies = commandLineLoadedAssemblies.ToList();
 			commandLineLoadedAssemblies.Clear(); // clear references once we don't need them anymore

ILSpy/SingleInstanceHandling.cs

@@ -1,158 +0,0 @@
-// Copyright (c) 2022 AlphaSierraPapa for the SharpDevelop Team
-// 
-// Permission is hereby granted, free of charge, to any person obtaining a copy of this
-// software and associated documentation files (the "Software"), to deal in the Software
-// without restriction, including without limitation the rights to use, copy, modify, merge,
-// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
-// to whom the Software is furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in all copies or
-// substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
-// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
-// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
-// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-// DEALINGS IN THE SOFTWARE.
-
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.IO;
-using System.Linq;
-using System.Threading;
-
-namespace ICSharpCode.ILSpy
-{
-	internal static class SingleInstanceHandling
-	{
-		internal static Mutex SingleInstanceMutex;
-
-		internal static void ForceSingleInstance(IEnumerable<string> cmdArgs)
-		{
-			bool isFirst;
-			try
-			{
-				SingleInstanceMutex = new Mutex(initiallyOwned: true, @"Local\ILSpyInstance", out isFirst);
-			}
-			catch (WaitHandleCannotBeOpenedException)
-			{
-				isFirst = true;
-			}
-			if (!isFirst)
-			{
-				try
-				{
-					SingleInstanceMutex.WaitOne(10000);
-				}
-				catch (AbandonedMutexException)
-				{
-					// continue, there is no concurrent start happening.
-				}
-			}
-			cmdArgs = cmdArgs.Select(FullyQualifyPath);
-			string message = string.Join(Environment.NewLine, cmdArgs);
-			if (SendToPreviousInstance("ILSpy:\r\n" + message, !App.CommandLineArguments.NoActivate))
-			{
-				ReleaseSingleInstanceMutex();
-				Environment.Exit(0);
-			}
-		}
-
-		internal static string FullyQualifyPath(string argument)
-		{
-			// Fully qualify the paths before passing them to another process,
-			// because that process might use a different current directory.
-			if (string.IsNullOrEmpty(argument) || argument[0] == '-')
-				return argument;
-			try
-			{
-				if (argument.StartsWith("@"))
-				{
-					return "@" + FullyQualifyPath(argument.Substring(1));
-				}
-				return Path.Combine(Environment.CurrentDirectory, argument);
-			}
-			catch (ArgumentException)
-			{
-				return argument;
-			}
-		}
-
-		internal static void ReleaseSingleInstanceMutex()
-		{
-			var mutex = SingleInstanceMutex;
-			SingleInstanceMutex = null;
-			if (mutex == null)
-			{
-				return;
-			}
-			using (mutex)
-			{
-				mutex.ReleaseMutex();
-			}
-		}
-
-		#region Pass Command Line Arguments to previous instance
-		internal static bool SendToPreviousInstance(string message, bool activate)
-		{
-			string ownProcessName;
-			using (var ownProcess = Process.GetCurrentProcess())
-			{
-				ownProcessName = ownProcess.ProcessName;
-			}
-
-			bool success = false;
-			NativeMethods.EnumWindows(
-				(hWnd, lParam) => {
-					string windowTitle = NativeMethods.GetWindowText(hWnd, 100);
-					if (windowTitle.StartsWith("ILSpy", StringComparison.Ordinal))
-					{
-						string processName = NativeMethods.GetProcessNameFromWindow(hWnd);
-						Debug.WriteLine("Found {0:x4}: '{1}' in '{2}'", hWnd, windowTitle, processName);
-						if (string.Equals(processName, ownProcessName, StringComparison.OrdinalIgnoreCase))
-						{
-							IntPtr result = Send(hWnd, message);
-							Debug.WriteLine("WM_COPYDATA result: {0:x8}", result);
-							if (result == (IntPtr)1)
-							{
-								if (activate)
-									NativeMethods.SetForegroundWindow(hWnd);
-								success = true;
-								return false; // stop enumeration
-							}
-						}
-					}
-					return true; // continue enumeration
-				}, IntPtr.Zero);
-			return success;
-		}
-
-		unsafe static IntPtr Send(IntPtr hWnd, string message)
-		{
-			const uint SMTO_NORMAL = 0;
-
-			CopyDataStruct lParam;
-			lParam.Padding = IntPtr.Zero;
-			lParam.Size = message.Length * 2;
-			fixed (char* buffer = message)
-			{
-				lParam.Buffer = (IntPtr)buffer;
-				IntPtr result;
-				// SendMessage with 3s timeout (e.g. when the target process is stopped in the debugger)
-				if (NativeMethods.SendMessageTimeout(
-					hWnd, NativeMethods.WM_COPYDATA, IntPtr.Zero, ref lParam,
-					SMTO_NORMAL, 3000, out result) != IntPtr.Zero)
-				{
-					return result;
-				}
-				else
-				{
-					return IntPtr.Zero;
-				}
-			}
-		}
-		#endregion
-	}
-}