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

namespace AGVSystem
{
    static class Program
    {
        [DllImport("User32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
        private const int WS_SHOWNORMAL = 3;
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            try
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Process instance = RunningInstance();
                mainfrm.init2();
                if (instance == null)
                {
                    Application.Run(new mainfrm());
                }
                else
                {
                    HandleRunningInstance(instance);
                }
            }
            catch(Exception ex) { }
            //bool runOne;
            //Mutex run = new Mutex(true, "AGVSystem", out runOne);
            //if (runOne)
            //{
            //    run.ReleaseMutex();
            //    Application.EnableVisualStyles();
            //    Application.SetCompatibleTextRenderingDefault(false);
            //    Application.Run(new Form1());
            //}
            //else
            //{
            //    MessageBox.Show("程序已运行!");
            //}
        }

        /// <summary> 
        /// 获取正在运行的实例，没有运行的实例返回null; 
        /// </summary> 
        public static Process RunningInstance()
        {
            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName(current.ProcessName);
            foreach (Process process in processes)
            {
                if (process.Id != current.Id)
                {
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
                    {
                        return process;
                    }
                }
            }
            return null;
        }

        /// <summary> 
        /// 显示已运行的程序。 
        /// </summary> 
        public static void HandleRunningInstance(Process instance)
        {
            ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL); //显示，可以注释掉 
            SetForegroundWindow(instance.MainWindowHandle);            //放到前端 
        }
    }
}