一个程序只能启动一次实现

原文网址: http://free56.cn/post/3.html

using System;
using System.Runtime.InteropServices;

namespace JKLib
{
    
    /**//// <summary>
    /// 一个程序只能启动一次实现
    /// </summary>
    public class SingleInstance
    {
        [DllImport("user32.dll")] 
        private static extern IntPtr FindWindow(string lpClassName,string lpWindowName);
        [DllImport("user32.dll")] 
        private static extern bool SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32.dll")] 
        private static extern bool ShowWindowAsync(IntPtr hWnd,int nCmdShow);
        [DllImport("user32.dll")] 
        private static extern bool IsIconic(IntPtr hWnd);

        /**//// <summary>
        /// 显示窗体命令值 
        /// </summary>
        private const int SW_RESTORE = 9;

        /**//// <summary>
        /// 窗体名称
        /// </summary>
        private string WinTitle;

        /**//// <summary>
        /// 一个程序只能启动一次实现
        /// </summary>
        /// <param name="_WinTitle">程序名</param>
        public SingleInstance(string _WinTitle)
        {
            WinTitle = _WinTitle;
        }

        private IntPtr hWnd = (System.IntPtr)null;

        /**//// <summary>
        /// 是否只有一个窗口
        /// </summary>
        public bool IsSingleInstance
        {
            get
            {
                hWnd = FindWindow(null,WinTitle);
                return hWnd == (System.IntPtr)null;
            }
        }
        /**//// <summary>
        /// 使当前程序进程处于活动状态
        /// </summary>
        public void RaiseOtherProcess()
        {
            if(hWnd == (System.IntPtr)null) return;
            else
            {
                if (IsIconic(hWnd))
                {
                    ShowWindowAsync(hWnd,SW_RESTORE);
                }
                SetForegroundWindow(hWnd);
                return;
            }
        }
    }
}

原文网址:  http://free56.cn/post/3.html