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[WIP] Initial part of singleInstance

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This commit is contained in:
Terry MacDonald 2022-01-01 16:22:12 +13:00
parent 2deee7eb15
commit bdd93e0956
9 changed files with 208 additions and 508 deletions
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5
DisplayMagician/DisplayMagician.csproj
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@ -122,7 +122,6 @@
<Compile Include="IconFromFile.cs" />
<Compile Include="IconUtils.cs" />
<Compile Include="ImageUtils.cs" />
<Compile Include="ISingleInstanceApp.cs" />
<Compile Include="NativeMethods.cs" />
<Compile Include="Processes\ImpersonationHelper.cs" />
<Compile Include="MessageItem.cs" />
@ -215,10 +214,6 @@
</Compile>
<Compile Include="Utils.cs" />
<Compile Include="Validators.cs" />
<Compile Include="InterProcess\IPCClient.cs" />
<Compile Include="InterProcess\InstanceStatus.cs" />
<Compile Include="InterProcess\IService.cs" />
<Compile Include="InterProcess\IPCService.cs" />
<Compile Include="Resources\Language.Designer.cs">
<AutoGen>True</AutoGen>
<DesignTime>True</DesignTime>

18
DisplayMagician/ISingleInstanceApp.cs
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@ -1,18 +0,0 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DisplayMagician
{
using System.Collections.Generic;
/// <summary>
/// http://blogs.microsoft.co.il/arik/2010/05/28/wpf-single-instance-application/
/// </summary>
public interface ISingleInstanceApp
{
bool SignalExternalCommandLineArgs(IList<string> args);
}
}

100
DisplayMagician/InterProcess/IPCClient.cs
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@ -1,100 +0,0 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.ServiceModel;
using System.ServiceModel.Description;
namespace DisplayMagician.InterProcess
{
internal class IPCClient : ClientBase<IService>, IService
{
private static readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
public IPCClient(Process process)
: base(
new ServiceEndpoint(
ContractDescription.GetContract(typeof(IService)),
new NetNamedPipeBinding(),
new EndpointAddress(
$"net.pipe://localhost/DisplayMagician_IPC{process.Id}/Service")))
{
}
public int HoldProcessId
{
get => Channel.HoldProcessId;
}
public InstanceStatus Status
{
get => Channel.Status;
}
public void StopHold()
{
Channel.StopHold();
}
public static IEnumerable<IPCClient> QueryAll()
{
var thisProcess = Process.GetCurrentProcess();
foreach (var process in Process.GetProcessesByName(thisProcess.ProcessName))
{
if (process.Id == thisProcess.Id)
{
continue;
}
IPCClient processChannel = null;
try
{
processChannel = new IPCClient(process);
}
catch (Exception ex)
{
Console.WriteLine($"IPCClient/QueryAll exception: {ex.Message}: {ex.StackTrace} - {ex.InnerException}");
// ignored
}
if (processChannel != null)
{
yield return processChannel;
}
}
}
public static IPCClient QueryByStatus(InstanceStatus status)
{
var thisProcess = Process.GetCurrentProcess();
foreach (var process in Process.GetProcessesByName(thisProcess.ProcessName))
{
if (process.Id != thisProcess.Id)
{
IPCClient processChannel = null;
try
{
processChannel = new IPCClient(process);
if (processChannel.Status == status)
{
return processChannel;
}
}
catch (Exception ex)
{
processChannel = null;
logger.Error(ex, $"IPCClient/QueryByStatus: Couldn't create an IPC Client");
Console.WriteLine($"IPCClient/QueryByStatus exception: {ex.Message}: {ex.StackTrace} - {ex.InnerException}");
// ignored
}
}
}
return null;
}
}
}

78
DisplayMagician/InterProcess/IPCService.cs
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@ -1,78 +0,0 @@
using System;
using System.Diagnostics;
using System.ServiceModel;
using System.Windows.Forms;
namespace DisplayMagician.InterProcess
{
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
internal class IPCService : IService
{
private static ServiceHost _serviceHost;
private static readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
private IPCService()
{
Status = InstanceStatus.Busy;
}
public int HoldProcessId { get; set; } = 0;
public InstanceStatus Status { get; set; }
public void StopHold()
{
Application.Exit();
}
public static IPCService GetInstance()
{
if (_serviceHost != null || StartService())
{
return _serviceHost?.SingletonInstance as IPCService;
}
return null;
}
public static bool StartService()
{
if (_serviceHost == null)
{
try
{
var process = Process.GetCurrentProcess();
var service = new IPCService();
_serviceHost = new ServiceHost(
service,
new Uri($"net.pipe://localhost/DisplayMagician_IPC{process.Id}"));
_serviceHost.AddServiceEndpoint(typeof(IService), new NetNamedPipeBinding(), "Service");
_serviceHost.Open();
return true;
}
catch (Exception ex)
{
logger.Error(ex, $"IPCService/StartService exception: Couldn't create an IPC Service");
Console.WriteLine($"IPCService/StartService exception: {ex.Message}: {ex.StackTrace} - {ex.InnerException}");
try
{
_serviceHost?.Close();
}
catch (Exception ex2)
{
logger.Error(ex, $"IPCService/StartService exception: Couldn't close an IPC Service after error creating it");
Console.WriteLine($"IPCService/StartService exception 2: {ex2.Message}: {ex2.InnerException}");
// ignored
}
_serviceHost = null;
}
}
return false;
}
}
}

14
DisplayMagician/InterProcess/IService.cs
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@ -1,14 +0,0 @@
using System.ServiceModel;
namespace DisplayMagician.InterProcess
{
[ServiceContract]
internal interface IService
{
int HoldProcessId { [OperationContract] get; }
InstanceStatus Status { [OperationContract] get; }
[OperationContract(IsOneWay = true)]
void StopHold();
}
}

11
DisplayMagician/InterProcess/InstanceStatus.cs
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@ -1,11 +0,0 @@
namespace DisplayMagician.InterProcess
{
internal enum InstanceStatus
{
User,
Busy,
OnHold
}
}

64
DisplayMagician/Program.cs
View File

@ -7,7 +7,7 @@ using System.Reflection;
using System.Threading.Tasks;
using DesktopNotifications;
using System.Windows.Forms;
using DisplayMagician.InterProcess;
//using DisplayMagician.InterProcess;
using DisplayMagician.Resources;
using DisplayMagicianShared;
using DisplayMagician.UIForms;
@ -62,6 +62,20 @@ namespace DisplayMagician {
private static int Main(string[] args)
{
// Create the remote server if we're first instance, or
// If we're a subsequent instance, pass the command line parameters to the first instance and then
bool isFirstInstance = SingleInstance.LaunchOrReturn(otherInstance => { MessageBox.Show("got data: " + otherInstance.Skip(1).FirstOrDefault()); }, args);
if (isFirstInstance)
{
Console.WriteLine($"Program/Main: This is the first DisplayMagician to start, so will be the one to actually perform the actions.");
}
else
{
Console.WriteLine($"Program/Main: There is already another DisplayMagician running, so we'll use that one to actually perform the actions.");
Application.Exit();
}
// If we get here, then we're the first instance!
RegisterDisplayMagicianWithWindows();
// Prepare NLog for internal logging - Comment out when not required
@ -85,7 +99,7 @@ namespace DisplayMagician {
}
catch (Exception ex)
{
Console.WriteLine($"Program/StartUpNormally exception: Cannot create the Application Log Folder {AppLogPath} - {ex.Message}: {ex.StackTrace} - {ex.InnerException}");
Console.WriteLine($"Program/Main Exception: Cannot create the Application Log Folder {AppLogPath} - {ex.Message}: {ex.StackTrace} - {ex.InnerException}");
}
}
@ -242,27 +256,6 @@ namespace DisplayMagician {
Application.SetCompatibleTextRenderingDefault(false);
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
if (SingleInstance.InitializeAsFirstInstance("DisplayMagician"))
{
_syncContext = SynchronizationContext.Current;
// Setup Named Pipe listener
NamedPipeServerCreateServer();
return true;
}
else
{
// We are not the first instance, send the named pipe message with our payload and stop loading
var namedPipeXmlPayload = new Payload
{
CommandLineArguments = Environment.GetCommandLineArgs().ToList()
};
// Send the message
NamedPipeClientSendOptions(namedPipeXmlPayload);
return false; // Signal to quit
}
// Check if it's an upgrade from DisplayMagician v1 to v2
// and if it is then copy the old configs to the new filenames and
// explain to the user what they need to do.
@ -688,13 +681,13 @@ namespace DisplayMagician {
try
{
// Start the IPC Service to
if (!IPCService.StartService())
/*if (!IPCService.StartService())
{
throw new Exception(Language.Can_not_open_a_named_pipe_for_Inter_process_communication);
}
}*/
IPCService.GetInstance().Status = InstanceStatus.User;
//IPCService.GetInstance().Status = InstanceStatus.User;
// Close the splash screen
if (ProgramSettings.LoadSettings().ShowSplashScreen && AppSplashScreen != null && !AppSplashScreen.Disposing && !AppSplashScreen.IsDisposed)
@ -724,10 +717,10 @@ namespace DisplayMagician {
try
{
// Start the IPC Service to
if (!IPCService.StartService())
/*if (!IPCService.StartService())
{
throw new Exception(Language.Can_not_open_a_named_pipe_for_Inter_process_communication);
}
}*/
// Create the Shortcut Icon Cache if it doesn't exist so that it's avilable for all the program
if (!Directory.Exists(AppIconPath))
@ -758,7 +751,7 @@ namespace DisplayMagician {
logger.Error(ex, $"Program/StartUpApplication exception create Icon files for future use in {AppIconPath}");
}
IPCService.GetInstance().Status = InstanceStatus.User;
//IPCService.GetInstance().Status = InstanceStatus.User;
// Check for updates
CheckForUpdates();
@ -806,7 +799,7 @@ namespace DisplayMagician {
// Check there is only one version of this application so we won't
// mess with another monitoring session
if (
/*if (
IPCClient.QueryAll()
.Any(
client =>
@ -816,7 +809,7 @@ namespace DisplayMagician {
throw new Exception(
Language
.Another_instance_of_this_program_is_in_working_state_Please_close_other_instances_before_trying_to_switch_profile);
}
}*/
// Match the ShortcutName to the actual shortcut listed in the shortcut library
// And error if we can't find it.
@ -836,7 +829,7 @@ namespace DisplayMagician {
ShortcutRepository.RunShortcut(shortcutToRun);
}
IPCService.GetInstance().Status = InstanceStatus.Busy;
//IPCService.GetInstance().Status = InstanceStatus.Busy;
}
@ -1221,6 +1214,13 @@ namespace DisplayMagician {
}
}
public static bool SignalExternalCommandLineArgs(IList<string> args)
{
// handle command line arguments of second instance
// …
return true;
}
}

2
DisplayMagician/ShortcutRepository.cs
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@ -2,7 +2,7 @@
using AudioSwitcher.AudioApi.CoreAudio;
using DisplayMagician.GameLibraries;
using DisplayMagician.Processes;
using DisplayMagician.InterProcess;
//using DisplayMagician.InterProcess;
using DisplayMagicianShared;
using Microsoft.Toolkit.Uwp.Notifications;
using Newtonsoft.Json;

422
DisplayMagician/SingleInstance.cs
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@ -1,300 +1,226 @@
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Ipc;
using System.Runtime.Serialization.Formatters;
using System.Diagnostics;
using System.IO.Pipes;
using System.Linq;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Security.AccessControl;
using System.Security.Cryptography;
using System.Security.Principal;
using System.Text;
using System.Threading;
using System.Windows;
using System.Windows.Threading;
using System.Xml.Serialization;
namespace DisplayMagician
{
/// <summary>
/// This class checks to make sure that only one instance of
/// this application is running at a time.
/// Helper for creating or passing command args to a single application instance
/// </summary>
/// <remarks>
/// Note: this class should be used with some caution, because it does no
/// security checking. For example, if one instance of an app that uses this class
/// is running as Administrator, any other instance, even if it is not
/// running as Administrator, can activate it with command line arguments.
/// For most apps, this will not be much of an issue.
/// </remarks>
public static class SingleInstance
{
#region Private Fields
/// <summary>
/// Unique name to base the single instance decision on. Default's to a hash based on the executable location.
/// </summary>
public static string UniqueName { get; set; } = "DisplayMagician";
private static Mutex _mutexApplication;
private static readonly object _mutexLock = new object();
private static bool _firstApplicationInstance;
private static NamedPipeServerStream _namedPipeServerStream;
private static SynchronizationContext _syncContext;
private static Action<string[]> _otherInstanceCallback;
private static readonly object _namedPiperServerThreadLock = new object();
private static string GetMutexName() => $@"Mutex_{Environment.UserDomainName}_{Environment.UserName}_{UniqueName}";
private static string GetPipeName() => $@"Pipe_{Environment.UserDomainName}_{Environment.UserName}_{UniqueName}";
/// <summary>
/// String delimiter used in channel names.
/// Determines if the application should continue launching or return because it's not the first instance.
/// When not the first instance, the command line args will be passed to the first one.
/// </summary>
private const string Delimiter = ":";
/// <summary>
/// Suffix to the channel name.
/// </summary>
private const string ChannelNameSuffix = "DisplayMagicianIPCChannel";
/// <summary>
/// Remote service name.
/// </summary>
private const string RemoteServiceName = "DisplayMagicianService";
/// <summary>
/// IPC protocol used (string).
/// </summary>
private const string IpcProtocol = "ipc://";
/// <summary>
/// Application mutex.
/// </summary>
private static Mutex singleInstanceMutex;
/// <summary>
/// IPC channel for communications.
/// </summary>
private static IpcServerChannel channel;
/// <summary>
/// List of command line arguments for the application.
/// </summary>
private static IList<string> commandLineArgs;
#endregion
#region Public Properties
/// <summary>
/// Gets list of command line arguments for the application.
/// </summary>
public static IList<string> CommandLineArgs
/// <param name="otherInstanceCallback">Callback to execute on the first instance with command line args from subsequent launches.
/// Will not run on the main thread, marshalling may be required.</param>
/// <param name="args">Arguments from Main()</param>
/// <returns>true if the first instance, false if it's not the first instance.</returns>
public static bool LaunchOrReturn(Action<string[]> otherInstanceCallback, string[] args)
{
get { return commandLineArgs; }
}
_otherInstanceCallback = otherInstanceCallback ?? throw new ArgumentNullException(nameof(otherInstanceCallback));
#endregion
#region Public Methods
/// <summary>
/// Checks if the instance of the application attempting to start is the first instance.
/// If not, activates the first instance.
/// </summary>
/// <returns>True if this is the first instance of the application.</returns>
public static bool InitializeAsFirstInstance(string uniqueName)
{
commandLineArgs = GetCommandLineArgs(uniqueName);
// Build unique application Id and the IPC channel name.
string applicationIdentifier = uniqueName + Environment.UserName;
string channelName = String.Concat(applicationIdentifier, Delimiter, ChannelNameSuffix);
// Create mutex based on unique application Id to check if this is the first instance of the application.
bool firstInstance;
singleInstanceMutex = new Mutex(true, applicationIdentifier, out firstInstance);
if (firstInstance)
if (IsApplicationFirstInstance())
{
CreateRemoteService(channelName);
_syncContext = SynchronizationContext.Current;
// Setup Named Pipe listener
NamedPipeServerCreateServer();
return true;
}
else
{
SignalFirstInstance(channelName, commandLineArgs);
}
return firstInstance;
}
/// <summary>
/// Cleans up single-instance code, clearing shared resources, mutexes, etc.
/// </summary>
public static void Cleanup()
{
if (singleInstanceMutex != null)
{
singleInstanceMutex.Close();
singleInstanceMutex = null;
}
if (channel != null)
{
ChannelServices.UnregisterChannel(channel);
channel = null;
}
}
#endregion
#region Private Methods
/// <summary>
/// Gets command line args - for ClickOnce deployed applications, command line args may not be passed directly, they have to be retrieved.
/// </summary>
/// <returns>List of command line arg strings.</returns>
private static IList<string> GetCommandLineArgs(string uniqueApplicationName)
{
string[] args = null;
if (AppDomain.CurrentDomain.ActivationContext == null)
{
// The application was not clickonce deployed, get args from standard API's
args = Environment.GetCommandLineArgs();
}
else
{
// The application was clickonce deployed
// Clickonce deployed apps cannot recieve traditional commandline arguments
// As a workaround commandline arguments can be written to a shared location before
// the app is launched and the app can obtain its commandline arguments from the
// shared location
string appFolderPath = Path.Combine(
Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), uniqueApplicationName);
string cmdLinePath = Path.Combine(appFolderPath, "cmdline.txt");
if (File.Exists(cmdLinePath))
// We are not the first instance, send the named pipe message with our payload and stop loading
var namedPipeXmlPayload = new Payload
{
try
{
using (TextReader reader = new StreamReader(cmdLinePath, System.Text.Encoding.Unicode))
{
args = NativeMethods.CommandLineToArgvW(reader.ReadToEnd());
}
CommandLineArguments = Environment.GetCommandLineArgs().ToList()
};
File.Delete(cmdLinePath);
}
catch (IOException)
// Send the message
NamedPipeClientSendOptions(namedPipeXmlPayload);
return false; // Signal to quit
}
}
/// <summary>
/// Checks if this is the first instance of this application. Can be run multiple times.
/// </summary>
/// <returns></returns>
private static bool IsApplicationFirstInstance()
{
if (_mutexApplication == null)
{
lock (_mutexLock)
{
// Allow for multiple runs but only try and get the mutex once
if (_mutexApplication == null)
{
_mutexApplication = new Mutex(true, GetMutexName(), out _firstApplicationInstance);
}
}
}
if (args == null)
return _firstApplicationInstance;
}
/// <summary>
/// Uses a named pipe to send the currently parsed options to an already running instance.
/// </summary>
/// <param name="namedPipePayload"></param>
private static void NamedPipeClientSendOptions(Payload namedPipePayload)
{
try
{
args = new string[] { };
using (var namedPipeClientStream = new NamedPipeClientStream(".", GetPipeName(), PipeDirection.Out))
{
namedPipeClientStream.Connect(3000); // Maximum wait 3 seconds
var ser = new DataContractJsonSerializer(typeof(Payload));
ser.WriteObject(namedPipeClientStream, namedPipePayload);
}
}
return new List<string>(args);
}
/// <summary>
/// Creates a remote service for communication.
/// </summary>
/// <param name="channelName">Application's IPC channel name.</param>
private static void CreateRemoteService(string channelName)
{
BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
IDictionary props = new Dictionary<string, string>();
props["name"] = channelName;
props["portName"] = channelName;
props["exclusiveAddressUse"] = "false";
// Create the IPC Server channel with the channel properties
channel = new IpcServerChannel(props, serverProvider);
// Register the channel with the channel services
ChannelServices.RegisterChannel(channel, true);
// Expose the remote service with the REMOTE_SERVICE_NAME
IPCRemoteService remoteService = new IPCRemoteService();
RemotingServices.Marshal(remoteService, RemoteServiceName);
}
/// <summary>
/// Creates a client channel and obtains a reference to the remoting service exposed by the server -
/// in this case, the remoting service exposed by the first instance. Calls a function of the remoting service
/// class to pass on command line arguments from the second instance to the first and cause it to activate itself.
/// </summary>
/// <param name="channelName">Application's IPC channel name.</param>
/// <param name="args">
/// Command line arguments for the second instance, passed to the first instance to take appropriate action.
/// </param>
private static void SignalFirstInstance(string channelName, IList<string> args)
{
IpcClientChannel secondInstanceChannel = new IpcClientChannel();
ChannelServices.RegisterChannel(secondInstanceChannel, true);
string remotingServiceUrl = IpcProtocol + channelName + "/" + RemoteServiceName;
// Obtain a reference to the remoting service exposed by the server i.e the first instance of the application
IPCRemoteService firstInstanceRemoteServiceReference = (IPCRemoteService)RemotingServices.Connect(typeof(IPCRemoteService), remotingServiceUrl);
// Check that the remote service exists, in some cases the first instance may not yet have created one, in which case
// the second instance should just exit
if (firstInstanceRemoteServiceReference != null)
catch (Exception)
{
// Invoke a method of the remote service exposed by the first instance passing on the command line
// arguments and causing the first instance to activate itself
firstInstanceRemoteServiceReference.InvokeFirstInstance(args);
// Error connecting or sending
}
}
/// <summary>
/// Callback for activating first instance of the application.
/// Starts a new pipe server if one isn't already active.
/// </summary>
/// <param name="arg">Callback argument.</param>
/// <returns>Always null.</returns>
private static object ActivateFirstInstanceCallback(object arg)
private static void NamedPipeServerCreateServer()
{
// Get command line args to be passed to first instance
IList<string> args = arg as IList<string>;
ActivateFirstInstance(args);
return null;
// Create a new pipe accessible by local authenticated users, disallow network
var sidNetworkService = new SecurityIdentifier(WellKnownSidType.NetworkServiceSid, null);
var sidWorld = new SecurityIdentifier(WellKnownSidType.WorldSid, null);
var pipeSecurity = new PipeSecurity();
// Deny network access to the pipe
var accessRule = new PipeAccessRule(sidNetworkService, PipeAccessRights.ReadWrite, AccessControlType.Deny);
pipeSecurity.AddAccessRule(accessRule);
// Alow Everyone to read/write
accessRule = new PipeAccessRule(sidWorld, PipeAccessRights.ReadWrite, AccessControlType.Allow);
pipeSecurity.AddAccessRule(accessRule);
// Current user is the owner
SecurityIdentifier sidOwner = WindowsIdentity.GetCurrent().Owner;
if (sidOwner != null)
{
accessRule = new PipeAccessRule(sidOwner, PipeAccessRights.FullControl, AccessControlType.Allow);
pipeSecurity.AddAccessRule(accessRule);
}
// Create pipe and start the async connection wait
_namedPipeServerStream = new NamedPipeServerStream(
GetPipeName(),
PipeDirection.In,
1,
PipeTransmissionMode.Byte,
PipeOptions.Asynchronous,
0,
0,
pipeSecurity);
// Begin async wait for connections
_namedPipeServerStream.BeginWaitForConnection(NamedPipeServerConnectionCallback, _namedPipeServerStream);
}
/// <summary>
/// Activates the first instance of the application with arguments from a second instance.
/// The function called when a client connects to the named pipe. Note: This method is called on a non-UI thread.
/// </summary>
/// <param name="args">List of arguments to supply the first instance of the application.</param>
private static void ActivateFirstInstance(IList<string> args)
/// <param name="iAsyncResult"></param>
private static void NamedPipeServerConnectionCallback(IAsyncResult iAsyncResult)
{
// Set main window state and process command line args
if (Application.Current == null)
try
{
// End waiting for the connection
_namedPipeServerStream.EndWaitForConnection(iAsyncResult);
// Read data and prevent access to _namedPipeXmlPayload during threaded operations
lock (_namedPiperServerThreadLock)
{
var ser = new DataContractJsonSerializer(typeof(Payload));
var payload = (Payload)ser.ReadObject(_namedPipeServerStream);
// payload contains the data sent from the other instance
if (_syncContext != null)
{
_syncContext.Post(_ => _otherInstanceCallback(payload.CommandLineArguments.ToArray()), null);
}
else
{
_otherInstanceCallback(payload.CommandLineArguments.ToArray());
}
}
}
catch (ObjectDisposedException)
{
// EndWaitForConnection will exception when someone calls closes the pipe before connection made
// In that case we dont create any more pipes and just return
// This will happen when app is closing and our pipe is closed/disposed
return;
}
catch (Exception)
{
// ignored
}
finally
{
// Close the original pipe (we will create a new one each time)
_namedPipeServerStream.Dispose();
}
((TApplication)Application.Current).SignalExternalCommandLineArgs(args);
// Create a new pipe for next connection
NamedPipeServerCreateServer();
}
#endregion
#region Private Classes
/// <summary>
/// Remoting service class which is exposed by the server i.e the first instance and called by the second instance
/// to pass on the command line arguments to the first instance and cause it to activate itself.
/// </summary>
private class IPCRemoteService : MarshalByRefObject
/*private static string GetRunningProcessHash()
{
/// <summary>
/// Activates the first instance of the application.
/// </summary>
/// <param name="args">List of arguments to pass to the first instance.</param>
public void InvokeFirstInstance(IList<string> args)
using (var hash = SHA256.Create())
{
if (Application.Current != null)
{
// Do an asynchronous call to ActivateFirstInstance function
Application.Current.Dispatcher.BeginInvoke(
DispatcherPriority.Normal, new DispatcherOperationCallback(SingleInstance<TApplication>.ActivateFirstInstanceCallback), args);
}
var processPath = Process.GetCurrentProcess().MainModule.FileName;
var bytes = hash.ComputeHash(Encoding.UTF8.GetBytes(processPath));
return Convert.ToBase64String(bytes);
}
}*/
}
/// <summary>
/// Remoting Object's ease expires after every 5 minutes by default. We need to override the InitializeLifetimeService class
/// to ensure that lease never expires.
/// </summary>
/// <returns>Always null.</returns>
public override object InitializeLifetimeService()
{
return null;
}
}
#endregion
[DataContract]
public class Payload
{
/// <summary>
/// A list of command line arguments.
/// </summary>
[DataMember]
public List<string> CommandLineArguments { get; set; } = new List<string>();
}
}