如何在C＃中关闭/打开控制台使用Win32调用？ [英] How to close / open console within C# using Win32 calls?

问题描述

以下程序的Console.ReadKey（）抛出一个错误。

The following program throws an error on "Console.ReadKey()".

如何禁用它后，我重新启用控制台？

How do I re-enable the console after disabling it?

    using System;
    using System.Threading;
    using System.Runtime.InteropServices;

    namespace ConsoleApplication
    {
        class Program
        {
            static void Main(string[] args)
            {
                ThreadPool.QueueUserWorkItem((o) =>
                {
                    Thread.Sleep(1000);
                    IntPtr stdin = GetStdHandle(StdHandle.Stdin);
                    CloseHandle(stdin);
                });
                Console.ReadLine();
                Console.Write("ReadLine() successfully aborted by background thread.\n");
                Console.Write("[any key to exit]");
                Console.ReadKey(); // Throws an exception "Cannot read keys when either application does not have a console or when console input has been redirected from a file. Try Console.Read."
            }

            // P/Invoke:
            private enum StdHandle { Stdin = -10, Stdout = -11, Stderr = -12 };
            [DllImport("kernel32.dll")]
            private static extern IntPtr GetStdHandle(StdHandle std);
            [DllImport("kernel32.dll")]
            private static extern bool CloseHandle(IntPtr hdl);
        }
    }

额外专家

如果你想知道，我需要能够杀死后台线程运行的ReadLine（），在C＃。这似乎是唯一的出路（Thread.Abort的将无法工作，因为的ReadLine（）根深蒂固操作系统的肠子内，在不受控code）。有关于计算器这个话题谈了很多，没有人真正发现（或邮寄）终止到Console.ReadLine（）还没有一个令人满意的方法。我想，这code是在正确的轨道上 - 只要我们能够将其禁用后重新启用控制台

If you're wondering, I need to be able to kill a background thread running ReadLine(), within C#. This appears to be the only way (thread.Abort won't work because ReadLine() runs deep within the bowels of the operating system, in unmanaged code). There is a lot of talk on this topic on StackOverflow, nobody has really discovered (or posted) a satisfactory method of aborting Console.ReadLine() yet. I think this code is on the right track - if only we can re-enable the console after disabling it.

推荐答案

不知道是否有帮助，但是当我需要能够写入到一个双赢的形式应用程序控制台，我用这个类：

Don't know if it helps, but when I've needed to be able to write to the console in a win form app, I've used this class:

public class ConsoleHelper
{
    /// <summary>
    /// Allocates a new console for current process.
    /// </summary>
    [DllImport("kernel32.dll")]
    public static extern Boolean AllocConsole();

    /// <summary>
    /// Frees the console.
    /// </summary>
    [DllImport("kernel32.dll")]
    public static extern Boolean FreeConsole();
}

呼叫AllocConsole创建一个控制台，然后可以写入（和读取）它。然后调用FreeConsole时，即可大功告成。

Call AllocConsole to create a console and then you can write to (and read from) it. Then call FreeConsole when you're done.

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