keyboard hooking

 

keyhook class

public class KeyHook
    {
        [DllImport("user32.dll")] static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc callback, IntPtr hInstance, uint threadId);
        [DllImport("user32.dll")] static extern bool UnhookWindowsHookEx(IntPtr hInstance);
        [DllImport("user32.dll")] static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, int wParam, IntPtr lParam);
        [DllImport("kernel32.dll")] static extern IntPtr LoadLibrary(string lpFileName);

        public static event EventHandler<Keys> keypressed;
        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
        const int WH_KEYBOARD_LL = 13;
        const int WM_KEYDOWN = 0x100;
        private static LowLevelKeyboardProc _proc = hookProc;
        private static IntPtr hhook = IntPtr.Zero;
        public static void SetHook()
        {
            try
            {
                IntPtr hInstance = LoadLibrary("User32");
                hhook = SetWindowsHookEx(WH_KEYBOARD_LL, _proc, hInstance, 0);
            }
            catch(Exception ex)
            {
                ClsReviewMgr.Ins.clsLogCtrl.WriteLog("KeyHook", $"SetHook : {ex.ToString()}", VOLib.FunctionalGroup.Log.ClsLogData.LOG_LEVEL.DAY);
            }
        }

        public static void UnHook()
        {
            try
            {
                UnhookWindowsHookEx(hhook);
            }
            catch(Exception ex)
            {
                ClsReviewMgr.Ins.clsLogCtrl.WriteLog("KeyHook", $"UnHook : {ex.ToString()}", VOLib.FunctionalGroup.Log.ClsLogData.LOG_LEVEL.DAY);
            }
        }

        public static IntPtr hookProc(int code, IntPtr wParam, IntPtr lParam)
        {
            try
            {
                if (code >= 0 && wParam == (IntPtr)WM_KEYDOWN)
                {
                    int vkCode = Marshal.ReadInt32(lParam);

                    Keys key = (Keys)vkCode;

                    keypressed?.Invoke(null, key);   
                }
            }
            catch(Exception ex)
            {
                ClsReviewMgr.Ins.clsLogCtrl.WriteLog("KeyHook", $"hookProc : {ex.ToString()}", VOLib.FunctionalGroup.Log.ClsLogData.LOG_LEVEL.DAY);
            }

            return CallNextHookEx(hhook, code, (int)wParam, lParam);
        }
    }

 

해당클래스 사용하는곳

public void start()
{
    KeyHook.SetHook();

    KeyHook.keypressed += KeyHook_keypressed;
}

private void KeyHook_keypressed(object sender, Keys e)
{
    MessageBox.Show(e.ToString());
}