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POHow to close / open console within C# using Win32 calls?
 

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  1. POHow to close / open console within C# using Win32 calls?
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    <p>The following program throws an error on "Console.ReadKey()".</p> <p>How do I re-enable the console after disabling it?</p> <pre><code> using System; using System.Threading; using System.Runtime.InteropServices; namespace ConsoleApplication { class Program { static void Main(string[] args) { ThreadPool.QueueUserWorkItem((o) =&gt; { 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); } } </code></pre> <p><strong>Extra for Experts</strong> </p> <p>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.</p>
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    1. COIf you close the Handle...You would have to by hand open it again. Considering you just closed the Handle there is no gurantee you can use the same Handle again. Are you sure your closing the correct handle? I have to believe there is an easier way to abort a Readline then to close the bloody handle of the standard input.
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    2. CO@Ramhound I wish that there was an easier way to abort ReadLine. I've tried everything - .Abort, sending keys to the application (which only works for the current focus), etc. If there is a better way, I'm all ears.
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    3. CO@Ramhound The only other way I can think of is to write a clone of ReadLine in 100% managed C#, so .Abort will work, which is certainly more complex compared to a few lines of Win32 code.
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