Register winform app HotKeys - C#

Hotkey is a very useful shortcut for complex application. Sometimes we build application with much feature include in it hence will result of bad experience of end user because the feature dont have the shortcut keys.

Here is a sample to add shortcut keys or hotkeys for winform app in C# code.

GlobalHotkeys.cs

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


namespace Hotkeys
{
    public class GlobalHotkey
    {
        private int modifier;
        private int key;
        private IntPtr hWnd;
        private int id;


        public GlobalHotkey(int modifier, Keys key, Form form)
        {
            this.modifier = modifier;
            this.key = (int)key;
            this.hWnd = form.Handle;
            id = this.GetHashCode();
        }

        public bool Register()
        {
            return RegisterHotKey(hWnd, id, modifier, key);
        }

        public bool Unregiser()
        {
            return UnregisterHotKey(hWnd, id);
        }

        public override int GetHashCode()
        {
            return modifier ^ key ^ hWnd.ToInt32();
        }

        [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);

    }

}

CodeBehind WinForm 

 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Hotkeys;

namespace HotkeyWin
{
    public partial class Form1 : Form
    {
        private Hotkeys.GlobalHotkey ghk;
        public Form1()
        {
            InitializeComponent();
            ghk = new Hotkeys.GlobalHotkey(Constants.ALT + Constants.SHIFT, Keys.O, this);
        }

        private void HandleHotkey()
        {
            WriteLine("Hotkey pressed!");
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == Hotkeys.Constants.WM_HOTKEY_MSG_ID)
                HandleHotkey();
            base.WndProc(ref m);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            WriteLine("Trying to register SHIFT+ALT+O");
            if (ghk.Register())
                WriteLine("Hotkey registered.");
            else
                WriteLine("Hotkey failed to register");
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!ghk.Unregiser())
                MessageBox.Show("Hotkey failed to unregister!");
        }

        private void WriteLine(string text)
        {
            textBox1.Text += text + Environment.NewLine;
        }
    }
}

Output

By Mohd Zulkamal
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