C# register global hotkey ,onekey 注册多个全局热键以及单个全局热键

我们需要用非Hook的方法,来给我们的app 或者winform注册热键. 就像下面的 , 欧陆词典注册的一个热键F6一样,

在winform最小化的情况下,也能够全局响应热键. 这里使用系统API来注册.能够达到最好的性能.

代码如下:

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;

namespace ExampleForm
{
    public partial class Form1 : Form
    {
        //[System.Runtime.InteropServices.DllImport("user32.dll")]
        //private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        enum KeyModifier
        {
            None = 0,
            Alt = 1,
            Control = 2,
            Shift = 4,
            WinKey = 8
        }
        public Form1()
        {
            InitializeComponent();
            int id = 0;     // The id of the hotkey.
            //RegisterHotKey(this.Handle, id, (int)KeyModifier.Shift, Keys.A.GetHashCode());       // 注册 Shift + A 为全局热键
            RegisterHotKey(this.Handle, id, 0, Keys.F3.GetHashCode());//注册单个按钮F3,只需要把int fsModifiers设置为0即可
        }
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg == 0x0312)
            {
               

                Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF);                  // The key of the hotkey that was pressed.
                KeyModifier modifier = (KeyModifier)((int)m.LParam & 0xFFFF);       // The modifier of the hotkey that was pressed.
                int id = m.WParam.ToInt32();                                        // The id of the hotkey that was pressed.

                MessageBox.Show("Hotkey has been pressed!");
                // do something
            }
        }

        private void ExampleForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            UnregisterHotKey(this.Handle, 0);       // Unregister hotkey with id 0 before closing the form. You might want to call this more than once with different id values if you are planning to register more than one hotkey.
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
        }
    }
}