How to get a combination of keys in c#

Question

How can I capture Ctrl + Alt + K + P keys on a C# form? thanks

Answer 1

You can use GetKeyState to get the status of the other keys when one of the keys in the combination has been pressed. Here's an example on a form.

using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace DetectKeyChord
{
    public partial class Form1 : Form
    {
        private const int WM_KEYDOWN = 0x100;
        private const int KEY_PRESSED = 0x80;

        public Form1()
        {
            InitializeComponent();
        }

        public void ShortcutAction()
        {
            MessageBox.Show("Ctrl+Alt+K+P has been pressed.");
        }

        private bool IsKeyDown(Keys key)
        {
            return (NativeMethods.GetKeyState(key) & KEY_PRESSED) == KEY_PRESSED;
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_KEYDOWN)
            {
                //If any of the keys in the chord have been pressed, check to see if
                //the entire chord is down.
                if (new[] { Keys.P, Keys.K, Keys.ControlKey, Keys.Menu }.Contains((Keys)m.WParam))
                {
                    if (IsKeyDown(Keys.ControlKey) && IsKeyDown(Keys.Menu) && IsKeyDown(Keys.K) && IsKeyDown(Keys.P))
                    {
                        this.ShortcutAction();
                    }
                }
            }
            base.WndProc(ref m);
        }
    }

    public static class NativeMethods
    {
        [DllImport("USER32.dll")]
        public static extern short GetKeyState(Keys nVirtKey);
    }
}