From 2abc0e902014e9ca6947f2eb378dffba485fd699 Mon Sep 17 00:00:00 2001 From: RedShirtMB Mark Linton redshirt linton Date: Sun, 5 Aug 2012 08:38:56 -0700 Subject: Moved SingleInstance to MediaBrowser.Common --- MediaBrowser.Common/Util/SingleInstance.cs | 485 +++++++++++++++++++++ .../Util/SingleInstance.cs | 485 --------------------- 2 files changed, 485 insertions(+), 485 deletions(-) create mode 100644 MediaBrowser.Common/Util/SingleInstance.cs delete mode 100644 MediaBrowser.ServerApplication/Util/SingleInstance.cs diff --git a/MediaBrowser.Common/Util/SingleInstance.cs b/MediaBrowser.Common/Util/SingleInstance.cs new file mode 100644 index 000000000..837d3bb57 --- /dev/null +++ b/MediaBrowser.Common/Util/SingleInstance.cs @@ -0,0 +1,485 @@ +//----------------------------------------------------------------------- +// +// Copyright (c) Microsoft Corporation. All rights reserved. +// +// +// This class checks to make sure that only one instance of +// this application is running at a time. +// +//----------------------------------------------------------------------- + +namespace Microsoft.Shell +{ + 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.Threading; + using System.Windows; + using System.Windows.Threading; + using System.Xml.Serialization; + using System.Security; + using System.Runtime.InteropServices; + using System.ComponentModel; + + internal enum WM + { + NULL = 0x0000, + CREATE = 0x0001, + DESTROY = 0x0002, + MOVE = 0x0003, + SIZE = 0x0005, + ACTIVATE = 0x0006, + SETFOCUS = 0x0007, + KILLFOCUS = 0x0008, + ENABLE = 0x000A, + SETREDRAW = 0x000B, + SETTEXT = 0x000C, + GETTEXT = 0x000D, + GETTEXTLENGTH = 0x000E, + PAINT = 0x000F, + CLOSE = 0x0010, + QUERYENDSESSION = 0x0011, + QUIT = 0x0012, + QUERYOPEN = 0x0013, + ERASEBKGND = 0x0014, + SYSCOLORCHANGE = 0x0015, + SHOWWINDOW = 0x0018, + ACTIVATEAPP = 0x001C, + SETCURSOR = 0x0020, + MOUSEACTIVATE = 0x0021, + CHILDACTIVATE = 0x0022, + QUEUESYNC = 0x0023, + GETMINMAXINFO = 0x0024, + + WINDOWPOSCHANGING = 0x0046, + WINDOWPOSCHANGED = 0x0047, + + CONTEXTMENU = 0x007B, + STYLECHANGING = 0x007C, + STYLECHANGED = 0x007D, + DISPLAYCHANGE = 0x007E, + GETICON = 0x007F, + SETICON = 0x0080, + NCCREATE = 0x0081, + NCDESTROY = 0x0082, + NCCALCSIZE = 0x0083, + NCHITTEST = 0x0084, + NCPAINT = 0x0085, + NCACTIVATE = 0x0086, + GETDLGCODE = 0x0087, + SYNCPAINT = 0x0088, + NCMOUSEMOVE = 0x00A0, + NCLBUTTONDOWN = 0x00A1, + NCLBUTTONUP = 0x00A2, + NCLBUTTONDBLCLK = 0x00A3, + NCRBUTTONDOWN = 0x00A4, + NCRBUTTONUP = 0x00A5, + NCRBUTTONDBLCLK = 0x00A6, + NCMBUTTONDOWN = 0x00A7, + NCMBUTTONUP = 0x00A8, + NCMBUTTONDBLCLK = 0x00A9, + + SYSKEYDOWN = 0x0104, + SYSKEYUP = 0x0105, + SYSCHAR = 0x0106, + SYSDEADCHAR = 0x0107, + COMMAND = 0x0111, + SYSCOMMAND = 0x0112, + + MOUSEMOVE = 0x0200, + LBUTTONDOWN = 0x0201, + LBUTTONUP = 0x0202, + LBUTTONDBLCLK = 0x0203, + RBUTTONDOWN = 0x0204, + RBUTTONUP = 0x0205, + RBUTTONDBLCLK = 0x0206, + MBUTTONDOWN = 0x0207, + MBUTTONUP = 0x0208, + MBUTTONDBLCLK = 0x0209, + MOUSEWHEEL = 0x020A, + XBUTTONDOWN = 0x020B, + XBUTTONUP = 0x020C, + XBUTTONDBLCLK = 0x020D, + MOUSEHWHEEL = 0x020E, + + + CAPTURECHANGED = 0x0215, + + ENTERSIZEMOVE = 0x0231, + EXITSIZEMOVE = 0x0232, + + IME_SETCONTEXT = 0x0281, + IME_NOTIFY = 0x0282, + IME_CONTROL = 0x0283, + IME_COMPOSITIONFULL = 0x0284, + IME_SELECT = 0x0285, + IME_CHAR = 0x0286, + IME_REQUEST = 0x0288, + IME_KEYDOWN = 0x0290, + IME_KEYUP = 0x0291, + + NCMOUSELEAVE = 0x02A2, + + DWMCOMPOSITIONCHANGED = 0x031E, + DWMNCRENDERINGCHANGED = 0x031F, + DWMCOLORIZATIONCOLORCHANGED = 0x0320, + DWMWINDOWMAXIMIZEDCHANGE = 0x0321, + + #region Windows 7 + DWMSENDICONICTHUMBNAIL = 0x0323, + DWMSENDICONICLIVEPREVIEWBITMAP = 0x0326, + #endregion + + USER = 0x0400, + + // This is the hard-coded message value used by WinForms for Shell_NotifyIcon. + // It's relatively safe to reuse. + TRAYMOUSEMESSAGE = 0x800, //WM_USER + 1024 + APP = 0x8000, + } + + [SuppressUnmanagedCodeSecurity] + internal static class NativeMethods + { + /// + /// Delegate declaration that matches WndProc signatures. + /// + public delegate IntPtr MessageHandler(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled); + + [DllImport("shell32.dll", EntryPoint = "CommandLineToArgvW", CharSet = CharSet.Unicode)] + private static extern IntPtr _CommandLineToArgvW([MarshalAs(UnmanagedType.LPWStr)] string cmdLine, out int numArgs); + + + [DllImport("kernel32.dll", EntryPoint = "LocalFree", SetLastError = true)] + private static extern IntPtr _LocalFree(IntPtr hMem); + + + public static string[] CommandLineToArgvW(string cmdLine) + { + IntPtr argv = IntPtr.Zero; + try + { + int numArgs = 0; + + argv = _CommandLineToArgvW(cmdLine, out numArgs); + if (argv == IntPtr.Zero) + { + throw new Win32Exception(); + } + var result = new string[numArgs]; + + for (int i = 0; i < numArgs; i++) + { + IntPtr currArg = Marshal.ReadIntPtr(argv, i * Marshal.SizeOf(typeof(IntPtr))); + result[i] = Marshal.PtrToStringUni(currArg); + } + + return result; + } + finally + { + + IntPtr p = _LocalFree(argv); + // Otherwise LocalFree failed. + // Assert.AreEqual(IntPtr.Zero, p); + } + } + + } + + public interface ISingleInstanceApp + { + bool SignalExternalCommandLineArgs(IList args); + } + + /// + /// This class checks to make sure that only one instance of + /// this application is running at a time. + /// + /// + /// 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. + /// + public static class SingleInstance + where TApplication : Application, ISingleInstanceApp + { + #region Private Fields + + /// + /// String delimiter used in channel names. + /// + private const string Delimiter = ":"; + + /// + /// Suffix to the channel name. + /// + private const string ChannelNameSuffix = "SingeInstanceIPCChannel"; + + /// + /// Remote service name. + /// + private const string RemoteServiceName = "SingleInstanceApplicationService"; + + /// + /// IPC protocol used (string). + /// + private const string IpcProtocol = "ipc://"; + + /// + /// Application mutex. + /// + private static Mutex singleInstanceMutex; + + /// + /// IPC channel for communications. + /// + private static IpcServerChannel channel; + + /// + /// List of command line arguments for the application. + /// + private static IList commandLineArgs; + + #endregion + + #region Public Properties + + /// + /// Gets list of command line arguments for the application. + /// + public static IList CommandLineArgs + { + get { return commandLineArgs; } + } + + #endregion + + #region Public Methods + + /// + /// Checks if the instance of the application attempting to start is the first instance. + /// If not, activates the first instance. + /// + /// True if this is the first instance of the application. + 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) + { + CreateRemoteService(channelName); + } + else + { + SignalFirstInstance(channelName, commandLineArgs); + } + + return firstInstance; + } + + /// + /// Cleans up single-instance code, clearing shared resources, mutexes, etc. + /// + public static void Cleanup() + { + if (singleInstanceMutex != null) + { + singleInstanceMutex.Close(); + singleInstanceMutex = null; + } + + if (channel != null) + { + ChannelServices.UnregisterChannel(channel); + channel = null; + } + } + + #endregion + + #region Private Methods + + /// + /// Gets command line args - for ClickOnce deployed applications, command line args may not be passed directly, they have to be retrieved. + /// + /// List of command line arg strings. + private static IList 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)) + { + try + { + using (TextReader reader = new StreamReader(cmdLinePath, System.Text.Encoding.Unicode)) + { + args = NativeMethods.CommandLineToArgvW(reader.ReadToEnd()); + } + + File.Delete(cmdLinePath); + } + catch (IOException) + { + } + } + } + + if (args == null) + { + args = new string[] { }; + } + + return new List(args); + } + + /// + /// Creates a remote service for communication. + /// + /// Application's IPC channel name. + private static void CreateRemoteService(string channelName) + { + BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider(); + serverProvider.TypeFilterLevel = TypeFilterLevel.Full; + IDictionary props = new Dictionary(); + + 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); + } + + /// + /// 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. + /// + /// Application's IPC channel name. + /// + /// Command line arguments for the second instance, passed to the first instance to take appropriate action. + /// + private static void SignalFirstInstance(string channelName, IList 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) + { + // 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); + } + } + + /// + /// Callback for activating first instance of the application. + /// + /// Callback argument. + /// Always null. + private static object ActivateFirstInstanceCallback(object arg) + { + // Get command line args to be passed to first instance + IList args = arg as IList; + ActivateFirstInstance(args); + return null; + } + + /// + /// Activates the first instance of the application with arguments from a second instance. + /// + /// List of arguments to supply the first instance of the application. + private static void ActivateFirstInstance(IList args) + { + // Set main window state and process command line args + if (Application.Current == null) + { + return; + } + + ((TApplication)Application.Current).SignalExternalCommandLineArgs(args); + } + + #endregion + + #region Private Classes + + /// + /// 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. + /// + private class IPCRemoteService : MarshalByRefObject + { + /// + /// Activates the first instance of the application. + /// + /// List of arguments to pass to the first instance. + public void InvokeFirstInstance(IList args) + { + if (Application.Current != null) + { + // Do an asynchronous call to ActivateFirstInstance function + Application.Current.Dispatcher.BeginInvoke( + DispatcherPriority.Normal, new DispatcherOperationCallback(SingleInstance.ActivateFirstInstanceCallback), args); + } + } + + /// + /// Remoting Object's ease expires after every 5 minutes by default. We need to override the InitializeLifetimeService class + /// to ensure that lease never expires. + /// + /// Always null. + public override object InitializeLifetimeService() + { + return null; + } + } + + #endregion + } +} diff --git a/MediaBrowser.ServerApplication/Util/SingleInstance.cs b/MediaBrowser.ServerApplication/Util/SingleInstance.cs deleted file mode 100644 index 837d3bb57..000000000 --- a/MediaBrowser.ServerApplication/Util/SingleInstance.cs +++ /dev/null @@ -1,485 +0,0 @@ -//----------------------------------------------------------------------- -// -// Copyright (c) Microsoft Corporation. All rights reserved. -// -// -// This class checks to make sure that only one instance of -// this application is running at a time. -// -//----------------------------------------------------------------------- - -namespace Microsoft.Shell -{ - 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.Threading; - using System.Windows; - using System.Windows.Threading; - using System.Xml.Serialization; - using System.Security; - using System.Runtime.InteropServices; - using System.ComponentModel; - - internal enum WM - { - NULL = 0x0000, - CREATE = 0x0001, - DESTROY = 0x0002, - MOVE = 0x0003, - SIZE = 0x0005, - ACTIVATE = 0x0006, - SETFOCUS = 0x0007, - KILLFOCUS = 0x0008, - ENABLE = 0x000A, - SETREDRAW = 0x000B, - SETTEXT = 0x000C, - GETTEXT = 0x000D, - GETTEXTLENGTH = 0x000E, - PAINT = 0x000F, - CLOSE = 0x0010, - QUERYENDSESSION = 0x0011, - QUIT = 0x0012, - QUERYOPEN = 0x0013, - ERASEBKGND = 0x0014, - SYSCOLORCHANGE = 0x0015, - SHOWWINDOW = 0x0018, - ACTIVATEAPP = 0x001C, - SETCURSOR = 0x0020, - MOUSEACTIVATE = 0x0021, - CHILDACTIVATE = 0x0022, - QUEUESYNC = 0x0023, - GETMINMAXINFO = 0x0024, - - WINDOWPOSCHANGING = 0x0046, - WINDOWPOSCHANGED = 0x0047, - - CONTEXTMENU = 0x007B, - STYLECHANGING = 0x007C, - STYLECHANGED = 0x007D, - DISPLAYCHANGE = 0x007E, - GETICON = 0x007F, - SETICON = 0x0080, - NCCREATE = 0x0081, - NCDESTROY = 0x0082, - NCCALCSIZE = 0x0083, - NCHITTEST = 0x0084, - NCPAINT = 0x0085, - NCACTIVATE = 0x0086, - GETDLGCODE = 0x0087, - SYNCPAINT = 0x0088, - NCMOUSEMOVE = 0x00A0, - NCLBUTTONDOWN = 0x00A1, - NCLBUTTONUP = 0x00A2, - NCLBUTTONDBLCLK = 0x00A3, - NCRBUTTONDOWN = 0x00A4, - NCRBUTTONUP = 0x00A5, - NCRBUTTONDBLCLK = 0x00A6, - NCMBUTTONDOWN = 0x00A7, - NCMBUTTONUP = 0x00A8, - NCMBUTTONDBLCLK = 0x00A9, - - SYSKEYDOWN = 0x0104, - SYSKEYUP = 0x0105, - SYSCHAR = 0x0106, - SYSDEADCHAR = 0x0107, - COMMAND = 0x0111, - SYSCOMMAND = 0x0112, - - MOUSEMOVE = 0x0200, - LBUTTONDOWN = 0x0201, - LBUTTONUP = 0x0202, - LBUTTONDBLCLK = 0x0203, - RBUTTONDOWN = 0x0204, - RBUTTONUP = 0x0205, - RBUTTONDBLCLK = 0x0206, - MBUTTONDOWN = 0x0207, - MBUTTONUP = 0x0208, - MBUTTONDBLCLK = 0x0209, - MOUSEWHEEL = 0x020A, - XBUTTONDOWN = 0x020B, - XBUTTONUP = 0x020C, - XBUTTONDBLCLK = 0x020D, - MOUSEHWHEEL = 0x020E, - - - CAPTURECHANGED = 0x0215, - - ENTERSIZEMOVE = 0x0231, - EXITSIZEMOVE = 0x0232, - - IME_SETCONTEXT = 0x0281, - IME_NOTIFY = 0x0282, - IME_CONTROL = 0x0283, - IME_COMPOSITIONFULL = 0x0284, - IME_SELECT = 0x0285, - IME_CHAR = 0x0286, - IME_REQUEST = 0x0288, - IME_KEYDOWN = 0x0290, - IME_KEYUP = 0x0291, - - NCMOUSELEAVE = 0x02A2, - - DWMCOMPOSITIONCHANGED = 0x031E, - DWMNCRENDERINGCHANGED = 0x031F, - DWMCOLORIZATIONCOLORCHANGED = 0x0320, - DWMWINDOWMAXIMIZEDCHANGE = 0x0321, - - #region Windows 7 - DWMSENDICONICTHUMBNAIL = 0x0323, - DWMSENDICONICLIVEPREVIEWBITMAP = 0x0326, - #endregion - - USER = 0x0400, - - // This is the hard-coded message value used by WinForms for Shell_NotifyIcon. - // It's relatively safe to reuse. - TRAYMOUSEMESSAGE = 0x800, //WM_USER + 1024 - APP = 0x8000, - } - - [SuppressUnmanagedCodeSecurity] - internal static class NativeMethods - { - /// - /// Delegate declaration that matches WndProc signatures. - /// - public delegate IntPtr MessageHandler(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled); - - [DllImport("shell32.dll", EntryPoint = "CommandLineToArgvW", CharSet = CharSet.Unicode)] - private static extern IntPtr _CommandLineToArgvW([MarshalAs(UnmanagedType.LPWStr)] string cmdLine, out int numArgs); - - - [DllImport("kernel32.dll", EntryPoint = "LocalFree", SetLastError = true)] - private static extern IntPtr _LocalFree(IntPtr hMem); - - - public static string[] CommandLineToArgvW(string cmdLine) - { - IntPtr argv = IntPtr.Zero; - try - { - int numArgs = 0; - - argv = _CommandLineToArgvW(cmdLine, out numArgs); - if (argv == IntPtr.Zero) - { - throw new Win32Exception(); - } - var result = new string[numArgs]; - - for (int i = 0; i < numArgs; i++) - { - IntPtr currArg = Marshal.ReadIntPtr(argv, i * Marshal.SizeOf(typeof(IntPtr))); - result[i] = Marshal.PtrToStringUni(currArg); - } - - return result; - } - finally - { - - IntPtr p = _LocalFree(argv); - // Otherwise LocalFree failed. - // Assert.AreEqual(IntPtr.Zero, p); - } - } - - } - - public interface ISingleInstanceApp - { - bool SignalExternalCommandLineArgs(IList args); - } - - /// - /// This class checks to make sure that only one instance of - /// this application is running at a time. - /// - /// - /// 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. - /// - public static class SingleInstance - where TApplication : Application, ISingleInstanceApp - { - #region Private Fields - - /// - /// String delimiter used in channel names. - /// - private const string Delimiter = ":"; - - /// - /// Suffix to the channel name. - /// - private const string ChannelNameSuffix = "SingeInstanceIPCChannel"; - - /// - /// Remote service name. - /// - private const string RemoteServiceName = "SingleInstanceApplicationService"; - - /// - /// IPC protocol used (string). - /// - private const string IpcProtocol = "ipc://"; - - /// - /// Application mutex. - /// - private static Mutex singleInstanceMutex; - - /// - /// IPC channel for communications. - /// - private static IpcServerChannel channel; - - /// - /// List of command line arguments for the application. - /// - private static IList commandLineArgs; - - #endregion - - #region Public Properties - - /// - /// Gets list of command line arguments for the application. - /// - public static IList CommandLineArgs - { - get { return commandLineArgs; } - } - - #endregion - - #region Public Methods - - /// - /// Checks if the instance of the application attempting to start is the first instance. - /// If not, activates the first instance. - /// - /// True if this is the first instance of the application. - 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) - { - CreateRemoteService(channelName); - } - else - { - SignalFirstInstance(channelName, commandLineArgs); - } - - return firstInstance; - } - - /// - /// Cleans up single-instance code, clearing shared resources, mutexes, etc. - /// - public static void Cleanup() - { - if (singleInstanceMutex != null) - { - singleInstanceMutex.Close(); - singleInstanceMutex = null; - } - - if (channel != null) - { - ChannelServices.UnregisterChannel(channel); - channel = null; - } - } - - #endregion - - #region Private Methods - - /// - /// Gets command line args - for ClickOnce deployed applications, command line args may not be passed directly, they have to be retrieved. - /// - /// List of command line arg strings. - private static IList 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)) - { - try - { - using (TextReader reader = new StreamReader(cmdLinePath, System.Text.Encoding.Unicode)) - { - args = NativeMethods.CommandLineToArgvW(reader.ReadToEnd()); - } - - File.Delete(cmdLinePath); - } - catch (IOException) - { - } - } - } - - if (args == null) - { - args = new string[] { }; - } - - return new List(args); - } - - /// - /// Creates a remote service for communication. - /// - /// Application's IPC channel name. - private static void CreateRemoteService(string channelName) - { - BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider(); - serverProvider.TypeFilterLevel = TypeFilterLevel.Full; - IDictionary props = new Dictionary(); - - 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); - } - - /// - /// 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. - /// - /// Application's IPC channel name. - /// - /// Command line arguments for the second instance, passed to the first instance to take appropriate action. - /// - private static void SignalFirstInstance(string channelName, IList 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) - { - // 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); - } - } - - /// - /// Callback for activating first instance of the application. - /// - /// Callback argument. - /// Always null. - private static object ActivateFirstInstanceCallback(object arg) - { - // Get command line args to be passed to first instance - IList args = arg as IList; - ActivateFirstInstance(args); - return null; - } - - /// - /// Activates the first instance of the application with arguments from a second instance. - /// - /// List of arguments to supply the first instance of the application. - private static void ActivateFirstInstance(IList args) - { - // Set main window state and process command line args - if (Application.Current == null) - { - return; - } - - ((TApplication)Application.Current).SignalExternalCommandLineArgs(args); - } - - #endregion - - #region Private Classes - - /// - /// 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. - /// - private class IPCRemoteService : MarshalByRefObject - { - /// - /// Activates the first instance of the application. - /// - /// List of arguments to pass to the first instance. - public void InvokeFirstInstance(IList args) - { - if (Application.Current != null) - { - // Do an asynchronous call to ActivateFirstInstance function - Application.Current.Dispatcher.BeginInvoke( - DispatcherPriority.Normal, new DispatcherOperationCallback(SingleInstance.ActivateFirstInstanceCallback), args); - } - } - - /// - /// Remoting Object's ease expires after every 5 minutes by default. We need to override the InitializeLifetimeService class - /// to ensure that lease never expires. - /// - /// Always null. - public override object InitializeLifetimeService() - { - return null; - } - } - - #endregion - } -} -- cgit v1.2.3