[转]C#禁止重复运行程序,并激活原托盘程序

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Threading;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Reflection;

namespace GTranslate
{
    //static class Program
    //{
    //    /// 

    //    /// The main entry point for the application.
    //    /// 
    //    //[STAThread]
    //    //static void Main()
    //    //{
    //    //    Application.EnableVisualStyles();
    //    //    Application.SetCompatibleTextRenderingDefault(false);
    //    //    Application.Run(new Main());
    //    //}

    //    private const int WS_SHOWSTATE = 9;//用当前的大小和位置显示一个窗口，不改变活动窗口  

    //    [STAThread]
    //    static void Main()
    //    {

    //        bool createdNew;
    //        //系统能够识别有名称的互斥，因此可以使用它禁止应用程序启动两次 
    //        //第二个参数可以设置为产品的名称:Application.ProductName 
    //        //每次启动应用程序，都会验证名称为SingletonWinAppMutex的互斥是否存在     
    //        Mutex mutex = new Mutex(false, "GTranslate", out createdNew);
    //        //如果已运行，则在前端显示         
    //        //createdNew == false，说明程序已运行      
    //        if (!createdNew)
    //        {
    //            Process instance = GetExistProcess();
    //            if (instance != null)
    //            {
    //                //MessageBox.Show("程序已经运行,进程名字："+instance.ProcessName, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    //                SetForegroud(instance);
    //                Application.Exit();
    //                //Environment.Exit(0);
    //                return;
    //            }
    //        }
    //        Application.EnableVisualStyles();
    //        Application.SetCompatibleTextRenderingDefault(false);
    //        Application.Run(new Main());
    //    }

    //    /*
    //     * 查看程序是否已经运行
    //     */
    //    private static Process GetExistProcess()
    //    {
    //        Process currentProcess = Process.GetCurrentProcess();
    //        foreach (Process process in Process.GetProcessesByName(currentProcess.ProcessName))
    //        {
    //            //MessageBox.Show(currentProcess.ProcessName.ToString());
    //            if ((process.Id != currentProcess.Id) && (Assembly.GetExecutingAssembly().Location == currentProcess.MainModule.FileName))
    //            {
    //                return process;
    //            }
    //        }
    //        return null;
    //    }

    //    private static void SetForegroud(Process instance)
    //    {

    //        IntPtr mainFormHandle = instance.MainWindowHandle;

    //        if (mainFormHandle != IntPtr.Zero)
    //        {
    //            //PostMessage(mainFormHandle);
    //            //instance.CloseMainWindow();
    //            ShowWindowAsync(mainFormHandle, WS_SHOWSTATE);
    //            ShowWindow(mainFormHandle, WS_SHOWSTATE);
    //            //Control.FromHandle(mainFormHandle).Show();
    //            SwitchToThisWindow(instance.MainWindowHandle, true);
    //            MessageBox.Show(mainFormHandle.ToString() + instance.MainWindowTitle);
    //            SetForegroundWindow(mainFormHandle);
    //        }

    //    }

    //    [DllImport("User32.dll")]
    //    private static extern bool SetForegroundWindow(IntPtr hWnd);

    //    [DllImport("User32.dll")]
    //    private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);

    //    [DllImport("user32.dll ", SetLastError = true)]
    //    static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);
    //    [DllImport("user32.dll", EntryPoint = "ShowWindow", CharSet = CharSet.Auto)]
    //    private static extern int ShowWindow(IntPtr hwnd, int nCmdShow);


    //}

    static class Program
    {
        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(int hWnd, int cmdShow);

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string lpWindowName);

        [DllImport("User32")]
        static extern int SetForegroundWindow(int hwnd);

        private const int SW_NORMAL = 1; //正常弹出窗体  

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Process currentProcess = Process.GetCurrentProcess();

            //判断程序是否已经启动
            Mutex mutex = new Mutex(false, "GTranslate");
            bool Running = !mutex.WaitOne(0, false);
            if (!Running)
            {
                Application.Run(new Main());
            }
            else
            {
                //MessageBox.Show("程序已经运行" + Process.GetProcessesByName(currentProcess.ProcessName)[0].MainWindowTitle, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                int WINDOW_HANDLER = FindWindow(null, "Google Translate   V 1.0  BY: Z.A.CHEN");   //程序标题或类名二选1
                if (WINDOW_HANDLER > 0)
                {
                    //MessageBox.Show(WINDOW_HANDLER.ToString());
                    ShowWindowAsync(WINDOW_HANDLER, SW_NORMAL);
                    SetForegroundWindow(WINDOW_HANDLER);
                }
                Environment.Exit(0);
            }
        }
    }
}

注释掉的程序为不成功的代码。

为了实现比较好的效果，做好还是采用发消息的方法来实现。