注册系统热键类(原创)

C#注册系统热键类,参考多篇文章封装而成,只需一个构造函数即可完成,尤其适合于WPF

参考文章:http://www.cnblogs.com/dabaopku/archive/2010/02/21/1670793.html

源码下载

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Interop;
using System.Collections;

namespace ThunderStarter
{
    /// <summary>
    /// 直接构造类实例即可注册
    /// 自动完成注销
    /// 注意注册时会抛出异常
    /// </summary>
    class HotKey
        //注册系统热键类
        //热键会随着程序结束自动解除,不会写入注册表
    {
        #region Member

        int KeyId ;         //热键编号
        IntPtr Handle ;     //窗体句柄
        Window window ;     //热键所在窗体
        uint Controlkey ;   //热键控制键
        uint Key ;          //热键主键

        public delegate void OnHotkeyEventHandeler();     //热键事件委托
        public event OnHotkeyEventHandeler OnHotKey=null;   //热键事件    

        static Hashtable KeyPair = new Hashtable();         //热键哈希表

        private const int WM_HOTKEY = 0x0312;       // 热键消息编号

        public enum KeyFlags    //控制键编码
        {
            MOD_ALT = 0x1,
            MOD_CONTROL = 0x2,
            MOD_SHIFT = 0x4,
            MOD_WIN = 0x8
        }        

        #endregion

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="win">注册窗体</param>
        /// <param name="control">控制键</param>
        /// <param name="key">主键</param>
        public HotKey(Window win, HotKey.KeyFlags control, Keys key)
            //构造函数,注册热键
        {
            Handle = new WindowInteropHelper(win).Handle;
            window=win;
            Controlkey = (uint)control;
            Key = (uint)key;
            KeyId=(int)Controlkey+(int)Key*10;
            if (HotKey.KeyPair.ContainsKey(KeyId))
            {
                throw new Exception("热键已经被注册!");
            }

            //注册热键
            if(false == HotKey.RegisterHotKey(Handle, KeyId, Controlkey, Key))
            {
                throw new Exception("热键注册失败!");
            }
            if(HotKey.KeyPair.Count==0){
                //消息挂钩只能连接一次!!
                if(false == InstallHotKeyHook(this))
                {
                    throw new Exception("消息挂钩连接失败!");
                }
            }

            //添加这个热键索引
            HotKey.KeyPair.Add(KeyId, this);
            
        }

        #region core

        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint controlKey, uint virtualKey);
                
        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
        
        static private bool InstallHotKeyHook(HotKey hk)
            //安装热键处理挂钩
        {
            if (hk.window == null || hk.Handle==IntPtr.Zero)
                return false;

            //获得消息源
            System.Windows.Interop.HwndSource source = System.Windows.Interop.HwndSource.FromHwnd(hk.Handle);
            if (source==null)  return false;

            //挂接事件
            source.AddHook(HotKey.HotKeyHook);
            return true;
        }
       
        static private IntPtr HotKeyHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
            //热键处理过程
        {
            if (msg == WM_HOTKEY)
            {
                HotKey hk = (HotKey)HotKey.KeyPair[(int)wParam];
                if (hk.OnHotKey != null)   hk.OnHotKey();                    
            }    
            return IntPtr.Zero;
        }
 
        ~HotKey()
            //析构函数,解除热键
        {
           HotKey.UnregisterHotKey(Handle, KeyId);
        }

        #endregion
    }
}