How to force C net app to run only one instance in Windows

Question

Possible Duplicate    What is the correct way to create a single instance application        How to force C   net app to run only one instance in Windows

User · Answer

to force running only one instace of a program in .net (C#) use this code in program.cs file:

public static Process PriorProcess()
    // Returns a System.Diagnostics.Process pointing to
    // a pre-existing process with the same name as the
    // current one, if any; or null if the current process
    // is unique.
    {
        Process curr = Process.GetCurrentProcess();
        Process[] procs = Process.GetProcessesByName(curr.ProcessName);
        foreach (Process p in procs)
        {
            if ((p.Id != curr.Id) &&
                (p.MainModule.FileName == curr.MainModule.FileName))
                return p;
        }
        return null;
    }

and the folowing:

[STAThread]
    static void Main()
    {
        if (PriorProcess() != null)
        {

            MessageBox.Show("Another instance of the app is already running.");
            return;
        }
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form());
    }

User · Answer

This is what I use in my application   static void Main       bool mutexCreated   false    System Threading Mutex mutex   new System Threading Mutex  true    Local slimCODE slimKEYS exe   out mutexCreated       if   mutexCreated           if  MessageBox Show         slimKEYS is already running  Hotkeys cannot be shared between different instances  Are you sure you wish to run this second instance           slimKEYS already running         MessageBoxButtons YesNo        MessageBoxIcon Question      DialogResult Yes               mutex Close          return                  The usual stuff with Application Run      mutex Close

User · Answer

another way to single instance an application is to check their hash sums  after messing around with mutex  didn t work as i want  i got it working this way        DllImport  user32 dll         return  MarshalAs UnmanagedType Bool       static extern bool SetForegroundWindow IntPtr hWnd        public Main                 InitializeComponent             Process current   Process GetCurrentProcess            string currentmd5   md5hash current MainModule FileName           Process   processlist   Process GetProcesses            foreach  Process process in processlist                        if  process Id    current Id                                try                                       if  currentmd5    md5hash process MainModule FileName                                                 SetForegroundWindow process MainWindowHandle                           Environment Exit 0                                                           catch     your exception          your exception goes here                                         private string md5hash string file                string check          using  FileStream FileCheck   File OpenRead file                         MD5 md5   new MD5CryptoServiceProvider                byte   md5Hash   md5 ComputeHash FileCheck               check   BitConverter ToString md5Hash  Replace  -       ToLower                       return check          it checks only md5 sums by process id   if an instance of this application was found  it focuses the running application and exit itself   you can rename it or do what you want with your file  it wont open twice if the md5 hash is the same   may someone has suggestions to it  i know it is answered  but maybe someone is looking for a mutex alternative

User · Answer

This is what I use in my application   static void Main       bool mutexCreated   false    System Threading Mutex mutex   new System Threading Mutex  true    Local slimCODE slimKEYS exe   out mutexCreated       if   mutexCreated           if  MessageBox Show         slimKEYS is already running  Hotkeys cannot be shared between different instances  Are you sure you wish to run this second instance           slimKEYS already running         MessageBoxButtons YesNo        MessageBoxIcon Question      DialogResult Yes               mutex Close          return                  The usual stuff with Application Run      mutex Close

User · Answer

another way to single instance an application is to check their hash sums  after messing around with mutex  didn t work as i want  i got it working this way        DllImport  user32 dll         return  MarshalAs UnmanagedType Bool       static extern bool SetForegroundWindow IntPtr hWnd        public Main                 InitializeComponent             Process current   Process GetCurrentProcess            string currentmd5   md5hash current MainModule FileName           Process   processlist   Process GetProcesses            foreach  Process process in processlist                        if  process Id    current Id                                try                                       if  currentmd5    md5hash process MainModule FileName                                                 SetForegroundWindow process MainWindowHandle                           Environment Exit 0                                                           catch     your exception          your exception goes here                                         private string md5hash string file                string check          using  FileStream FileCheck   File OpenRead file                         MD5 md5   new MD5CryptoServiceProvider                byte   md5Hash   md5 ComputeHash FileCheck               check   BitConverter ToString md5Hash  Replace  -       ToLower                       return check          it checks only md5 sums by process id   if an instance of this application was found  it focuses the running application and exit itself   you can rename it or do what you want with your file  it wont open twice if the md5 hash is the same   may someone has suggestions to it  i know it is answered  but maybe someone is looking for a mutex alternative

User · Answer

I prefer a mutex solution similar to the following   As this way it re-focuses on the app if it is already loaded  using System Threading    DllImport  user32 dll     return  MarshalAs UnmanagedType Bool   static extern bool SetForegroundWindow IntPtr hWnd         lt summary gt      The main entry point for the application       lt  summary gt   STAThread  static void Main        bool createdNew   true     using  Mutex mutex   new Mutex true   MyApplicationName   out createdNew              if  createdNew                   Application EnableVisualStyles             Application SetCompatibleTextRenderingDefault false            Application Run new MainForm                   else                  Process current   Process GetCurrentProcess             foreach  Process process in Process GetProcessesByName current ProcessName                          if  process Id    current Id                               SetForegroundWindow process MainWindowHandle                  break

User · Answer

I prefer a mutex solution similar to the following   As this way it re-focuses on the app if it is already loaded  using System Threading    DllImport  user32 dll     return  MarshalAs UnmanagedType Bool   static extern bool SetForegroundWindow IntPtr hWnd         lt summary gt      The main entry point for the application       lt  summary gt   STAThread  static void Main        bool createdNew   true     using  Mutex mutex   new Mutex true   MyApplicationName   out createdNew              if  createdNew                   Application EnableVisualStyles             Application SetCompatibleTextRenderingDefault false            Application Run new MainForm                   else                  Process current   Process GetCurrentProcess             foreach  Process process in Process GetProcessesByName current ProcessName                          if  process Id    current Id                               SetForegroundWindow process MainWindowHandle                  break

User · Answer

to force running only one instace of a program in .net (C#) use this code in program.cs file:

public static Process PriorProcess()
    // Returns a System.Diagnostics.Process pointing to
    // a pre-existing process with the same name as the
    // current one, if any; or null if the current process
    // is unique.
    {
        Process curr = Process.GetCurrentProcess();
        Process[] procs = Process.GetProcessesByName(curr.ProcessName);
        foreach (Process p in procs)
        {
            if ((p.Id != curr.Id) &&
                (p.MainModule.FileName == curr.MainModule.FileName))
                return p;
        }
        return null;
    }

and the folowing:

[STAThread]
    static void Main()
    {
        if (PriorProcess() != null)
        {

            MessageBox.Show("Another instance of the app is already running.");
            return;
        }
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form());
    }

User · Answer

This is what I use in my application   static void Main       bool mutexCreated   false    System Threading Mutex mutex   new System Threading Mutex  true    Local slimCODE slimKEYS exe   out mutexCreated       if   mutexCreated           if  MessageBox Show         slimKEYS is already running  Hotkeys cannot be shared between different instances  Are you sure you wish to run this second instance           slimKEYS already running         MessageBoxButtons YesNo        MessageBoxIcon Question      DialogResult Yes               mutex Close          return                  The usual stuff with Application Run      mutex Close

User · Answer

This is what I use in my application   static void Main       bool mutexCreated   false    System Threading Mutex mutex   new System Threading Mutex  true    Local slimCODE slimKEYS exe   out mutexCreated       if   mutexCreated           if  MessageBox Show         slimKEYS is already running  Hotkeys cannot be shared between different instances  Are you sure you wish to run this second instance           slimKEYS already running         MessageBoxButtons YesNo        MessageBoxIcon Question      DialogResult Yes               mutex Close          return                  The usual stuff with Application Run      mutex Close

User · Answer

I prefer a mutex solution similar to the following   As this way it re-focuses on the app if it is already loaded  using System Threading    DllImport  user32 dll     return  MarshalAs UnmanagedType Bool   static extern bool SetForegroundWindow IntPtr hWnd         lt summary gt      The main entry point for the application       lt  summary gt   STAThread  static void Main        bool createdNew   true     using  Mutex mutex   new Mutex true   MyApplicationName   out createdNew              if  createdNew                   Application EnableVisualStyles             Application SetCompatibleTextRenderingDefault false            Application Run new MainForm                   else                  Process current   Process GetCurrentProcess             foreach  Process process in Process GetProcessesByName current ProcessName                          if  process Id    current Id                               SetForegroundWindow process MainWindowHandle                  break

User · Answer

I prefer a mutex solution similar to the following   As this way it re-focuses on the app if it is already loaded  using System Threading    DllImport  user32 dll     return  MarshalAs UnmanagedType Bool   static extern bool SetForegroundWindow IntPtr hWnd         lt summary gt      The main entry point for the application       lt  summary gt   STAThread  static void Main        bool createdNew   true     using  Mutex mutex   new Mutex true   MyApplicationName   out createdNew              if  createdNew                   Application EnableVisualStyles             Application SetCompatibleTextRenderingDefault false            Application Run new MainForm                   else                  Process current   Process GetCurrentProcess             foreach  Process process in Process GetProcessesByName current ProcessName                          if  process Id    current Id                               SetForegroundWindow process MainWindowHandle                  break

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