OpenTween/ApplicationInstanceMutex.cs

   1 // OpenTween - Client of Twitter
   2 // Copyright (c) 2007-2012 kiri_feather (@kiri_feather) <kiri.feather@gmail.com>
   3 //           (c) 2008-2012 Moz (@syo68k)
   4 //           (c) 2008-2012 takeshik (@takeshik) <http://www.takeshik.org/>
   5 //           (c) 2010-2012 anis774 (@anis774) <http://d.hatena.ne.jp/anis774/>
   6 //           (c) 2010-2012 fantasticswallow (@f_swallow) <http://twitter.com/f_swallow>
   7 //           (c) 2012      Egtra (@egtra) <http://dev.activebasic.com/egtra/>
   8 //           (c) 2012      kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
   9 // All rights reserved.
  10 //
  11 // This file is part of OpenTween.
  12 //
  13 // This program is free software; you can redistribute it and/or modify it
  14 // under the terms of the GNU General public License as published by the Free
  15 // Software Foundation; either version 3 of the License, or (at your option)
  16 // any later version.
  17 //
  18 // This program is distributed in the hope that it will be useful, but
  19 // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General public License
  21 // for more details.
  22 //
  23 // You should have received a copy of the GNU General public License along
  24 // with this program. If not, see <http://www.gnu.org/licenses/>, or write to
  25 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  26 // Boston, MA 02110-1301, USA.
  27
  28 #nullable enable
  29
  30 using System;
  31 using System.Diagnostics;
  32 using System.Linq;
  33 using System.Threading;
  34
  35 namespace OpenTween
  36 {
  37     /// <summary>
  38     /// アプリケーションの多重起動を抑制するためのクラス
  39     /// </summary>
  40     public sealed class ApplicationInstanceMutex : IDisposable
  41     {
  42         public bool IsDisposed { get; private set; } = false;
  43
  44         private readonly Mutex mutex;
  45         private readonly bool createdNew;
  46
  47         public ApplicationInstanceMutex(string appName, string settingPath)
  48         {
  49             var name = $"{settingPath.Replace(@"\", "/")}/{appName}";
  50             this.mutex = new Mutex(initiallyOwned: true, name, out this.createdNew);
  51         }
  52
  53         /// <summary>
  54         /// 他のインスタンスが既に起動している場合は true、それ以外は false
  55         /// </summary>
  56         public bool InstanceExists
  57             => !this.createdNew;
  58
  59         public void TryActivatePreviousInstance()
  60         {
  61             // 実行中の同じアプリケーションのウィンドウ・ハンドルの取得
  62             var prevProcess = this.GetPreviousProcess();
  63             if (prevProcess == null)
  64                 return;
  65
  66             var windowHandle = NativeMethods.GetWindowHandle((uint)prevProcess.Id, ApplicationSettings.ApplicationName);
  67             if (windowHandle != IntPtr.Zero)
  68                 NativeMethods.SetActiveWindow(windowHandle);
  69         }
  70
  71         private Process? GetPreviousProcess()
  72         {
  73             try
  74             {
  75                 var currentProcess = Process.GetCurrentProcess();
  76
  77                 return Process.GetProcessesByName(currentProcess.ProcessName)
  78                     .Where(p => p.Id != currentProcess.Id)
  79                     .FirstOrDefault(p => p.MainModule.FileName.Equals(currentProcess.MainModule.FileName, StringComparison.OrdinalIgnoreCase));
  80             }
  81             catch
  82             {
  83                 return null;
  84             }
  85         }
  86
  87         public void Dispose()
  88         {
  89             if (this.IsDisposed)
  90                 return;
  91
  92             this.IsDisposed = true;
  93
  94             if (this.createdNew)
  95                 this.mutex.ReleaseMutex();
  96
  97             this.mutex.Dispose();
  98         }
  99     }
 100 }