如何使控制台应用程序侦听来自其他进程的按键？

Question

I'm new to C# programming and I'm attempting to write a Console App that will run in the background and perform an action when a key is pressed (ideally I would like to know how to do this for any key but, if that's not possible, then a specific key).

Here's an idea of what I want (please excuse and feel free to correct any bad coding as I'm just starting out).

public static void Main(string[] args)
{
    while(true)
    {
         ConsoleKeyInfo cki = Console.ReadKey();
         if( cki.Key == ConsoleKey.R )
         {
              Console.WriteLine("Run me");
         }
     }
 }

The above seems to work but only if the Console App is in focus. I would like it to happen even if the app isn't in focus.

I've done some research and read about registering 'hotkeys' but also read that this is dangerous in case another application is requiring that key?

I've also read similar questions on here but they seem to deal with Windows Forms and not just Console Apps.

Can anyone help shed any light on this?

Answer 1

You need to use

[DllImport("user32", SetLastError = true)]
private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
[DllImport("user32", SetLastError = true)]
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

But to make it work from console you'll need to create hidden form that will handle messages for you. Check out this class . It does exactly what you want.