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SingleInstance.cs文件, using System; using System.IO; using System.Diagnostics; using System.Threading; using System.Reflection; using System.Runtime.InteropServices; namespace Zhengzuo.CSharpCode { /// <summary> /// 只启动一个应用程序实例控制类 /// </summary> public static class SingleInstance { private const int WS_SHOWNORMAL = 1; [DllImport("User32.dll")] private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow); [DllImport("User32.dll")] private static extern bool SetForegroundWindow(IntPtr hWnd); //标志文件名称 private static string runFlagFullname = null; //声明同步基元 private static Mutex mutex = null; /// <summary> /// static Constructor /// </summary> static SingleInstance() { } #region api实现 /// <summary> /// 获取应用程序进程实例,如果没有匹配进程,返回Null /// </summary> /// <returns>返回当前Process实例</returns> public static Process GetRunningInstance() { Process currentProcess = Process.GetCurrentProcess();//获取当前进程 //获取当前运行程序完全限定名 string currentFileName = currentProcess.MainModule.FileName; //获取进程名为ProcessName的Process数组。 Process[] processes = Process.GetProcessesByName(currentProcess.ProcessName); //遍历有相同进程名称正在运行的进程 foreach (Process process in processes) { if (process.MainModule.FileName == currentFileName) { if (process.Id != currentProcess.Id)//根据进程ID排除当前进程 return process;//返回已运行的进程实例 } } return null; } /// <summary> /// 获取应用程序句柄,设置应用程序前台运行,并返回bool值 /// </summary> public static bool HandleRunningInstance(Process instance) { //确保窗口没有被最小化或最大化 ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL); //设置真实例程为foreground window return SetForegroundWindow(instance.MainWindowHandle); } /// <summary> /// 获取窗口句柄,设置应用程序前台运行,并返回bool值,重载方法 /// </summary> /// <returns></returns> public static bool HandleRunningInstance() { Process p = GetRunningInstance(); if (p != null) { HandleRunningInstance(p); return true; } return false; } #endregion #region Mutex实现 /// <summary> /// 创建应用程序进程Mutex /// </summary> /// <returns>返回创建结果,true表示创建成功,false创建失败。</returns> public static bool CreateMutex() { return CreateMutex(Assembly.GetEntryAssembly().FullName); } /// <summary> /// 创建应用程序进程Mutex /// </summary> /// <param name="name">Mutex名称</param> /// <returns>返回创建结果,true表示创建成功,false创建失败。</returns> public static bool CreateMutex(string name) { bool result = false; mutex = new Mutex(true, name, out result); return result; } /// <summary> /// 释放Mutex /// </summary> public static void ReleaseMutex() { if (mutex != null) { mutex.Close(); } } #endregion #region 设置标志实现 /// <summary> /// 初始化程序运行标志,如果设置成功,返回true,已经设置返回false,设置失败将抛出异常 /// </summary> /// <returns>返回设置结果</returns> public static bool InitRunFlag() { if (File.Exists(RunFlag)) { return false; } using (FileStream fs = new FileStream(RunFlag, FileMode.Create)) { } return true; } /// <summary> /// 释放初始化程序运行标志,如果释放失败将抛出异常 /// </summary> public static void DisposeRunFlag() { if (File.Exists(RunFlag)) { File.Delete(RunFlag); } } /// <summary> /// 获取或设置程序运行标志,必须符合Windows文件命名规范 /// 这里实现生成临时文件为依据,如果修改成设置注册表,那就不需要符合文件命名规范。 /// </summary> public static string RunFlag { get { if(runFlagFullname == null) { string assemblyFullName = Assembly.GetEntryAssembly().FullName; //CommonApplicationData://"C:\\Documents and Settings\\All Users\\Application Data" string path = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData); //"C:\\Program Files\\Common Files" //string path = Environment.GetFolderPath(Environment.SpecialFolder.CommonProgramFiles); runFlagFullname = Path.Combine(path, assemblyFullName); } return runFlagFullname; } set { runFlagFullname = value; } } #endregion } } Program.cs文件, using System; using System.Windows.Forms; using System.Diagnostics; using Zhengzuo.CSharpCode; namespace Zhengzuo.Test.WinGui { static class Program { [STAThread] static void Main(string[] args) { if (args.Length == 0) //没有传送参数 { Process p = SingleInstance.GetRunningInstance(); if (p != null) //已经有应用程序副本执行 { SingleInstance.HandleRunningInstance(p); } else //启动第一个应用程序 { RunApplication(); } } else //有多个参数 { switch (args[0].ToLower()) { case "-api": if (SingleInstance.HandleRunningInstance() == false) { RunApplication(); } break; case "-mutex": if (args.Length >= 2) //参数中传入互斥体名称 { if ( SingleInstance.CreateMutex(args[1]) ) { RunApplication(); SingleInstance.ReleaseMutex(); } else { //调用SingleInstance.HandleRunningInstance()方法显示到前台。 MessageBox.Show("程序已经运行!"); } } else { if (SingleInstance.CreateMutex()) { RunApplication(); SingleInstance.ReleaseMutex(); } else { //调用SingleInstance.HandleRunningInstance()方法显示到前台。 MessageBox.Show("程序已经运行!"); } } break; case "-flag"://使用该方式需要在程序退出时调用 if (args.Length >= 2) //参数中传入运行标志文件名称 { SingleInstance.RunFlag = args[1]; } try { if (SingleInstance.InitRunFlag()) { RunApplication(); SingleInstance.DisposeRunFlag(); } else { //调用SingleInstance.HandleRunningInstance()方法显示到前台。 MessageBox.Show("程序已经运行!"); } } catch (Exception ex) { MessageBox.Show(ex.ToString()); } break; default: MessageBox.Show("应用程序参数设置失败。"); break; } } } //启动应用程序 static void RunApplication() { Application.EnableVisualStyles(); Application.Run(new MainForm()); } } } |
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