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Restore style
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Jack251970
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1 changed files with 133 additions and 132 deletions
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@ -6,137 +6,138 @@ using System.Windows;
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// http://blogs.microsoft.co.il/arik/2010/05/28/wpf-single-instance-application/
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// modified to allow single instace restart
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namespace Flow.Launcher.Helper;
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public interface ISingleInstanceApp
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namespace Flow.Launcher.Helper
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{
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void OnSecondAppStarted();
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}
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/// <summary>
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/// This class checks to make sure that only one instance of
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/// this application is running at a time.
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/// </summary>
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/// <remarks>
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/// Note: this class should be used with some caution, because it does no
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/// security checking. For example, if one instance of an app that uses this class
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/// is running as Administrator, any other instance, even if it is not
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/// running as Administrator, can activate it with command line arguments.
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/// For most apps, this will not be much of an issue.
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/// </remarks>
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public static class SingleInstance<TApplication> where TApplication: Application, ISingleInstanceApp
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{
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#region Private Fields
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/// <summary>
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/// String delimiter used in channel names.
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/// </summary>
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private const string Delimiter = ":";
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/// <summary>
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/// Suffix to the channel name.
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/// </summary>
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private const string ChannelNameSuffix = "SingeInstanceIPCChannel";
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private const string InstanceMutexName = "Flow.Launcher_Unique_Application_Mutex";
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/// <summary>
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/// Application mutex.
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/// </summary>
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internal static Mutex SingleInstanceMutex { get; set; }
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#endregion
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#region Public Methods
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/// <summary>
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/// Checks if the instance of the application attempting to start is the first instance.
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/// If not, activates the first instance.
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/// </summary>
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/// <returns>True if this is the first instance of the application.</returns>
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public static bool InitializeAsFirstInstance()
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{
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// Build unique application Id and the IPC channel name.
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string applicationIdentifier = InstanceMutexName + Environment.UserName;
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string channelName = string.Concat(applicationIdentifier, Delimiter, ChannelNameSuffix);
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// Create mutex based on unique application Id to check if this is the first instance of the application.
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SingleInstanceMutex = new Mutex(true, applicationIdentifier, out var firstInstance);
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if (firstInstance)
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{
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_ = CreateRemoteServiceAsync(channelName);
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return true;
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}
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else
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{
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_ = SignalFirstInstanceAsync(channelName);
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return false;
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}
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}
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/// <summary>
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/// Cleans up single-instance code, clearing shared resources, mutexes, etc.
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/// </summary>
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public static void Cleanup()
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{
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SingleInstanceMutex?.ReleaseMutex();
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}
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#endregion
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#region Private Methods
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/// <summary>
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/// Creates a remote server pipe for communication.
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/// Once receives signal from client, will activate first instance.
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/// </summary>
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/// <param name="channelName">Application's IPC channel name.</param>
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private static async Task CreateRemoteServiceAsync(string channelName)
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{
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using NamedPipeServerStream pipeServer = new NamedPipeServerStream(channelName, PipeDirection.In);
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while (true)
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{
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// Wait for connection to the pipe
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await pipeServer.WaitForConnectionAsync();
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// Do an asynchronous call to ActivateFirstInstance function
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Application.Current?.Dispatcher.Invoke(ActivateFirstInstance);
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// Disconect client
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pipeServer.Disconnect();
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}
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}
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/// <summary>
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/// Creates a client pipe and sends a signal to server to launch first instance
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/// </summary>
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/// <param name="channelName">Application's IPC channel name.</param>
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/// <param name="args">
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/// Command line arguments for the second instance, passed to the first instance to take appropriate action.
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/// </param>
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private static async Task SignalFirstInstanceAsync(string channelName)
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{
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// Create a client pipe connected to server
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using NamedPipeClientStream pipeClient = new NamedPipeClientStream(".", channelName, PipeDirection.Out);
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// Connect to the available pipe
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await pipeClient.ConnectAsync(0);
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}
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/// <summary>
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/// Activates the first instance of the application with arguments from a second instance.
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/// </summary>
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/// <param name="args">List of arguments to supply the first instance of the application.</param>
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private static void ActivateFirstInstance()
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{
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// Set main window state and process command line args
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if (Application.Current == null)
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{
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return;
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}
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((TApplication)Application.Current).OnSecondAppStarted();
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}
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#endregion
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public interface ISingleInstanceApp
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{
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void OnSecondAppStarted();
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}
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/// <summary>
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/// This class checks to make sure that only one instance of
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/// this application is running at a time.
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/// </summary>
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/// <remarks>
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/// Note: this class should be used with some caution, because it does no
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/// security checking. For example, if one instance of an app that uses this class
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/// is running as Administrator, any other instance, even if it is not
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/// running as Administrator, can activate it with command line arguments.
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/// For most apps, this will not be much of an issue.
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/// </remarks>
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public static class SingleInstance<TApplication> where TApplication : Application, ISingleInstanceApp
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{
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#region Private Fields
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/// <summary>
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/// String delimiter used in channel names.
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/// </summary>
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private const string Delimiter = ":";
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/// <summary>
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/// Suffix to the channel name.
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/// </summary>
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private const string ChannelNameSuffix = "SingeInstanceIPCChannel";
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private const string InstanceMutexName = "Flow.Launcher_Unique_Application_Mutex";
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/// <summary>
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/// Application mutex.
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/// </summary>
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internal static Mutex SingleInstanceMutex { get; set; }
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#endregion
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#region Public Methods
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/// <summary>
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/// Checks if the instance of the application attempting to start is the first instance.
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/// If not, activates the first instance.
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/// </summary>
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/// <returns>True if this is the first instance of the application.</returns>
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public static bool InitializeAsFirstInstance()
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{
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// Build unique application Id and the IPC channel name.
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string applicationIdentifier = InstanceMutexName + Environment.UserName;
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string channelName = string.Concat(applicationIdentifier, Delimiter, ChannelNameSuffix);
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// Create mutex based on unique application Id to check if this is the first instance of the application.
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SingleInstanceMutex = new Mutex(true, applicationIdentifier, out var firstInstance);
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if (firstInstance)
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{
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_ = CreateRemoteServiceAsync(channelName);
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return true;
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}
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else
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{
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_ = SignalFirstInstanceAsync(channelName);
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return false;
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}
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}
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/// <summary>
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/// Cleans up single-instance code, clearing shared resources, mutexes, etc.
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/// </summary>
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public static void Cleanup()
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{
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SingleInstanceMutex?.ReleaseMutex();
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}
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#endregion
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#region Private Methods
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/// <summary>
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/// Creates a remote server pipe for communication.
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/// Once receives signal from client, will activate first instance.
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/// </summary>
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/// <param name="channelName">Application's IPC channel name.</param>
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private static async Task CreateRemoteServiceAsync(string channelName)
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{
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using NamedPipeServerStream pipeServer = new NamedPipeServerStream(channelName, PipeDirection.In);
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while (true)
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{
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// Wait for connection to the pipe
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await pipeServer.WaitForConnectionAsync();
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// Do an asynchronous call to ActivateFirstInstance function
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Application.Current?.Dispatcher.Invoke(ActivateFirstInstance);
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// Disconect client
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pipeServer.Disconnect();
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}
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}
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/// <summary>
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/// Creates a client pipe and sends a signal to server to launch first instance
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/// </summary>
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/// <param name="channelName">Application's IPC channel name.</param>
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/// <param name="args">
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/// Command line arguments for the second instance, passed to the first instance to take appropriate action.
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/// </param>
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private static async Task SignalFirstInstanceAsync(string channelName)
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{
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// Create a client pipe connected to server
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using NamedPipeClientStream pipeClient = new NamedPipeClientStream(".", channelName, PipeDirection.Out);
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// Connect to the available pipe
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await pipeClient.ConnectAsync(0);
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}
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/// <summary>
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/// Activates the first instance of the application with arguments from a second instance.
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/// </summary>
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/// <param name="args">List of arguments to supply the first instance of the application.</param>
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private static void ActivateFirstInstance()
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{
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// Set main window state and process command line args
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if (Application.Current == null)
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{
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return;
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}
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((TApplication)Application.Current).OnSecondAppStarted();
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}
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#endregion
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}
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}
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