TaskbarGroups/TaskbarGroups/Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
using System.Threading;
using TaskbarGroups.NativeMethods;
namespace TaskbarGroups
{
    /// <summary>
    /// enter point
    /// </summary>
    static class Program
    {

        /// <summary>
        ///  全局窗体List，便于相互跳转
        /// </summary>
        public static List<Form> formList = new List<Form>();


        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            // 只运行一个实例
            Process instance = RunningInstance();
            if (instance == null)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new frmMain());
            }
            else
            {
                SetForegroundWindow(instance.MainWindowHandle);
            }
        }

        private static void SetForegroundWindow(IntPtr mainWindowHandle)
        {
            IntPtr h = Kernel32.OpenProcess(0x1F0FFF, false, Process.GetCurrentProcess().Id);
            
        }

        /// <summary>
        /// 检测是否已经启动了一个Application实例
        /// </summary>
        /// <returns>返回进程id，没有启动返回null</returns>
        private static Process RunningInstance()
        {
            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName(current.ProcessName);
            // 遍历正在有相同名字运行的例程 
            foreach (Process process in processes)
            {
                // 忽略现有的例程 
                if (process.Id != current.Id)
                {
                    // 确保例程从EXE文件运行 
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
                    {
                        // 返回另一个例程实例 
                        return process;
                    }
                }
            }
            // 没有其它的例程，返回null 
            return null;
        }
    }
}