获取低级按键

Question

我目前正在使用MOSA-OS编译器来开发操作系统，以将CIL编译为机器代码。不幸的是，在开发操作系统时，仅通过“ Console.ReadLine”来获取输入并不是那么简单。 System.Console没有任何作用，并且我也无法使用WinForms。有没有其他方法可以获取按键/输入？

Answer 1

连接到user32.dll是一个好方法。这是一个可以完成此工作的低级键盘侦听器。您需要做的就是监听OnKeyPressed事件。

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Input;

namespace DesktopWPFAppLowLevelKeyboardHook
{
    public class LowLevelKeyboardListener
    {
        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x0100;
        private const int WM_SYSKEYDOWN = 0x0104;

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);

        public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

        public event EventHandler<KeyPressedArgs> OnKeyPressed;

        private LowLevelKeyboardProc _proc;
        private IntPtr _hookID = IntPtr.Zero;

        public LowLevelKeyboardListener()
        {
            _proc = HookCallback;
        }

        public void HookKeyboard()
        {
            _hookID = SetHook(_proc);
        }

        public void UnHookKeyboard()
        {
            UnhookWindowsHookEx(_hookID);
        }

        private IntPtr SetHook(LowLevelKeyboardProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
            }
        }

        private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN)
            {
                int vkCode = Marshal.ReadInt32(lParam);

                if (OnKeyPressed != null) { OnKeyPressed(this, new KeyPressedArgs(KeyInterop.KeyFromVirtualKey(vkCode))); }
            }

            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }
    }

    public class KeyPressedArgs : EventArgs
    {
        public Key KeyPressed { get; private set; }

        public KeyPressedArgs(Key key)
        {
            KeyPressed = key;
        }
    }
}