[C#]Global hotkey

[holthelper]

I was looking around the net trying to find a simple keyboard hook. I came across this page: Get back to my program with keyboard

used it and it was good but I had to keep adding in new ids for each hotkey. I felt it could be improved and heres my improvements:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;


namespace Test
{
    enum Constants
    {
        NOMOD = 0x00,
        ALT = 0x01,
        CTRL = 0x02,
        SHIFT = 0x04,
        WIN = 0x08,
        WM_HOTKEY = 0x312
    }


    class HotKeys
    {
        [DllImport("user32.dll")]
        private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);
        [DllImport("user32.dll")]
        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);


        private Dictionary<int, int> _dic = new Dictionary<int, int>();


        public void addHotKey(Constants mod, Keys key)
        {
            _dic.Add((int)key, (int)mod);
        }


        public void registerKeys(Form form)
        {
            foreach (KeyValuePair<int, int> pair in _dic)
                RegisterHotKey(form.Handle, pair.Key, pair.Value, pair.Key);
        }


        public void disposeKeys(Form form)
        {
            foreach (KeyValuePair<int, int> pair in _dic)
                UnregisterHotKey(form.Handle, pair.Key);
        }
    }
}

to use add as many hotkeys as you want with:

HotKeys _key = new HotKeys();
_key.addHotKey(Constants.NOMOD, Keys.F1);
_key.addHotKey(Constants.NOMOD, Keys.F2);
_key.addHotKey(Constants.NOMOD, Keys.F3);

to register the keys add into your form load function:

_key.registerKeys(this);

to unregister the keys add this into your formClosing function:

_key.disposeKeys(this);

and final to get the hotkeys to actually do something add this function:

protected override void WndProc(ref Message m)
{
    if (m.Msg == (int)Constants.WM_HOTKEY)
    {
        switch (m.WParam.ToInt32())
        {
            case (int)Keys.F1:
                Console.WriteLine("Pressed F1");
                break;
            case (int)Keys.F2:
                Console.WriteLine("Pressed F2");
                break;
            case (int)Keys.F3:
                Console.WriteLine("Pressed F3");
                break;
        }
    }
    base.WndProc(ref m);
}

just thought I would share how I got my answer

[MentaL]