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C# Win32 console application ignores Ctrl + C to prevent the program from exiting the code example (picture)

Mar 11, 2017 pm 01:44 PM

C# The Win32 console application ignores Ctrl + C and prevents the program from exiting. The Windows API SetConsoleCtrlHandler function is used here.

Note: When debugging execution in VS, set a breakpoint in the handler routine. It will not be interrupted; it will prompt: No available source, as shown below:


Complete sample code:

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using System;

using System.Collections.Generic;

using System.Text;

using System.Diagnostics;

using System.Runtime.InteropServices;

using System.Threading;

 

/************************************************************************/

/* CSharp_Win32控制台应用程序忽略 Ctrl + C

 * Powered by:testcs_dn

 * Blog:http://www.php.cn/

 */

/************************************************************************/

namespace CSharp_Win32控制台应用程序忽略CtrlC

{

    //定义处理程序委托

    public delegate bool ConsoleCtrlDelegate(int ctrlType);

 

    class Program

    {

        //导入SetCtrlHandlerHandler API

        [DllImport("kernel32.dll")]

        private static extern bool SetConsoleCtrlHandler(ConsoleCtrlDelegate HandlerRoutine, bool Add);

        //当用户关闭Console时,系统会发送次消息

        private const int CTRL_CLOSE_EVENT = 2;

        //Ctrl+C,系统会发送次消息

        private const int CTRL_C_EVENT = 0;

        //Ctrl+break,系统会发送次消息

        private const int CTRL_BREAK_EVENT = 1;

        //用户退出(注销),系统会发送次消息

        private const int CTRL_LOGOFF_EVENT = 5;

        //系统关闭,系统会发送次消息

        private const int CTRL_SHUTDOWN_EVENT = 6;

 

        static void Main(string[] args)

        {

            Program cls = new Program();

            //Console.ReadKey();

        }

        public Program()

        {

            ConsoleCtrlDelegate consoleDelegete = new ConsoleCtrlDelegate(HandlerRoutine);

 

            bool bRet = SetConsoleCtrlHandler(consoleDelegete, true);

            if (bRet == false) //安装事件处理失败

            {

                Console.WriteLine("error");

                while (true)

                {

                    Console.WriteLine("...");

                    Thread.Sleep(1000);

                }

            }

            else

            {

                Console.WriteLine("ok");

                while (true)

                {

                    Console.WriteLine("...");

                    Thread.Sleep(1000);

                }

            }

 

        }

 

        /// <summary>

        /// 处理程序例程,在这里编写对指定事件的处理程序代码

        /// 注意:在VS中调试执行时,在这里设置断点,但不会中断;会提示:无可用源;

        /// </summary>

        /// <param name="CtrlType"></param>

        /// <returns></returns>

        private static bool HandlerRoutine(int ctrlType)

        {

            switch(ctrlType)

            {

                case CTRL_C_EVENT:

                    Console.WriteLine("C");

                    return true; //这里返回true,表示阻止响应系统对该程序的操作

                    //break;

                case CTRL_BREAK_EVENT:

                    Console.WriteLine("BREAK");

                    break;

                case CTRL_CLOSE_EVENT:

                    Console.WriteLine("CLOSE");

                    break;

                case CTRL_LOGOFF_EVENT:

                    Console.WriteLine("LOGOFF");

                    break;

                case CTRL_SHUTDOWN_EVENT:

                    Console.WriteLine("SHUTDOWN");

                    break;

            }

            //return true;//表示阻止响应系统对该程序的操作

            return false;//忽略处理,让系统进行默认操作

        }

    }

}

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