PowerToys/Wox.Infrastructure/GloablHotkey.cs

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace Wox.Infrastructure
{
    public enum KeyEvent : int
    {
        /// <summary>
        /// Key down
        /// </summary>
        WM_KEYDOWN = 256,

        /// <summary>
        /// Key up
        /// </summary>
        WM_KEYUP = 257,

        /// <summary>
        /// System key up
        /// </summary>
        WM_SYSKEYUP = 261,

        /// <summary>
        /// System key down
        /// </summary>
        WM_SYSKEYDOWN = 260
    }

    public static class InterceptKeys
    {
        public delegate IntPtr LowLevelKeyboardProc(int nCode, UIntPtr wParam, IntPtr lParam);

        private static int WH_KEYBOARD_LL = 13;

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

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

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

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

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

        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]
        public static extern short GetKeyState(int keyCode);

        [DllImport("user32.dll")]
        internal static extern uint SendInput(uint nInputs, [MarshalAs(UnmanagedType.LPArray), In] INPUT[] pInputs, int cbSize);
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct INPUT
    {
        [FieldOffset(0)]
        public Int32 type;//0-MOUSEINPUT;1-KEYBDINPUT;2-HARDWAREINPUT   
        [FieldOffset(4)]
        public KEYBDINPUT ki;
        [FieldOffset(4)]
        public MOUSEINPUT mi;
        [FieldOffset(4)]
        public HARDWAREINPUT hi;
    }
    [StructLayout(LayoutKind.Sequential)]
    public struct MOUSEINPUT
    {
        public Int32 dx;
        public Int32 dy;
        public Int32 mouseData;
        public Int32 dwFlags;
        public Int32 time;
        public IntPtr dwExtraInfo;
    }
    [StructLayout(LayoutKind.Sequential)]
    public struct KEYBDINPUT
    {
        public Int16 wVk;
        public Int16 wScan;
        public Int32 dwFlags;
        public Int32 time;
        public IntPtr dwExtraInfo;
    }
    [StructLayout(LayoutKind.Sequential)]
    public struct HARDWAREINPUT
    {
        public Int32 uMsg;
        public Int16 wParamL;
        public Int16 wParamH;
    }
}