一个程序在后台运行(即隐藏了窗体), 如果再次点击exe时则显示出已运行的程序窗体。

需求: 一个程序在后台运行(即隐藏了窗体), 如果再次点击该程序对应的exe时,不启动新进程,而是显示出原告已运行的程序窗体。

平台环境: .net

 

代码如下:

 

 

//添加引用

using System.Diagnostics;
using System.Runtime.InteropServices;

        [MTAThread]
        static void Main()
        {
            ///获取原先已运行的进程
            Process instance = null ;
            Process   current   =   Process.GetCurrentProcess();
            Process[]   processes   =   Process.GetProcessesByName   (current.ProcessName);

            foreach (Process process in processes)
            {
                //排除当前进程
                if (process.Id != current.Id)
                {
                    instance = process;

                    break;
                }
            }



            if (instance == null)
            {
                //没有运行的进程
                Application.Run(new Form());
            }
            else
            {
                //已有运行的进程,显示其主窗体
                ShowWindowAsync(instance.MainWindowHandle, 1);
                SetForegroundWindow(instance.MainWindowHandle);
            }
        }

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

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

 

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