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  • c# 单实例运行

    using System;
    using System.Collections.Generic;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;
    using System.Diagnostics;
    using System.Reflection;
    
    namespace BBrowser
    {
        static class Program
        {
            private const int WS_SHOWNORMAL = 1;
            public const Int32 AW_BLEND = 0x00080000;
            [DllImport("User32.dll")]
            private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
            [DllImport("User32.dll")]
            private static extern bool SetForegroundWindow(IntPtr hWnd);
            [DllImport("User32.dll")]
            private static extern bool AnimateWindow(IntPtr hwnd, int dwTime, int dwFlags);
            [DllImport("User32.dll", EntryPoint = "FindWindow")]
            private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);
    
    
            /// <summary>
            /// 应用程序的主入口点。
            /// </summary>
            [STAThread]
            static void Main() 
            {
                Process instance = GetRunningInstance();
                if (instance == null)
                {
                    Application.EnableVisualStyles();
                    Application.SetCompatibleTextRenderingDefault(false);
                    Application.Run(new FrmMain());
                }
                else
                {
                    HandleRunningInstance(instance);
                }
            }
    
            public static Process GetRunningInstance()
            {
                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;
            }
            public static void HandleRunningInstance(Process instance)
            {
                if (instance.MainWindowHandle.ToInt32() != 0)
                {
                    ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL);
                    SetForegroundWindow(instance.MainWindowHandle);
                }
                else
                {
                    IntPtr hwnd = FindWindow(null, "浏览器");
                    if (hwnd.ToInt32() == 0)
                        hwnd = FindWindow(null, "浏览器");
                    ShowWindowAsync(hwnd, WS_SHOWNORMAL);
                    SetForegroundWindow(hwnd);
                }
            }
        }
    }

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  • 原文地址:https://www.cnblogs.com/whisht/p/3085057.html
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