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基于C#實現(xiàn)熱鍵注冊工具類

更新時間：2023年12月05日 08:59:30 作者：rjcql

這篇文章主要為大家詳細(xì)介紹了一個驗證過的熱鍵注冊工具類,使用系統(tǒng)類庫user32.dll中的RegisterHotkey函數(shù)來實現(xiàn)全局熱鍵的注冊,感興趣的小伙伴可以學(xué)習(xí)一下

寫在前面

介紹一個驗證過的熱鍵注冊工具類，使用系統(tǒng)類庫user32.dll中的RegisterHotkey函數(shù)來實現(xiàn)全局熱鍵的注冊。

代碼實現(xiàn)

    [Flags]
    public enum KeyModifiers
    {
        Alt = 1,
        Control = 2,
        Shift = 4,
        Windows = 8,
        NoRepeat = 0x4000
    }
 
    public static class HotKeyHelper
    {
        [DllImport("user32", SetLastError = true)]
        private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
 
        [DllImport("user32", SetLastError = true)]
        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
 
        private static int _id = 0;
        private static volatile MessageWindow _wnd;
        private static volatile IntPtr _hwnd;
        private static ManualResetEvent _windowReadyEvent = new ManualResetEvent(false);
        static HotKeyHelper()
        {
            Thread messageLoop = new Thread(delegate ()
            {
                Application.Run(new MessageWindow());
            });
            messageLoop.Name = "MessageLoopThread";
            messageLoop.IsBackground = true;
            messageLoop.Start();
        }
 
        public static event EventHandler<HotKeyEventArgs> HotKeyPressed;
 
        public static int RegisterHotKey(Keys key, KeyModifiers modifiers)
        {
            _windowReadyEvent.WaitOne();
            int id = System.Threading.Interlocked.Increment(ref _id);
            _wnd.Invoke(new RegisterHotKeyDelegate(RegisterHotKeyInternal), _hwnd, id, (uint)modifiers, (uint)key);
            return id;
        }
 
        public static void UnregisterHotKey(int id)
        {
            _wnd.Invoke(new UnRegisterHotKeyDelegate(UnRegisterHotKeyInternal), _hwnd, id);
        }
 
        delegate void RegisterHotKeyDelegate(IntPtr hwnd, int id, uint modifiers, uint key);
        delegate void UnRegisterHotKeyDelegate(IntPtr hwnd, int id);
 
        private static void RegisterHotKeyInternal(IntPtr hwnd, int id, uint modifiers, uint key)
        {
            RegisterHotKey(hwnd, id, modifiers, key);
        }
 
        private static void UnRegisterHotKeyInternal(IntPtr hwnd, int id)
        {
            UnregisterHotKey(_hwnd, id);
        }
 
        private static void OnHotKeyPressed(HotKeyEventArgs e)
        {
            if (HotKeyHelper.HotKeyPressed != null)
            {
                HotKeyHelper.HotKeyPressed(null, e);
            }
        }
 
        private class MessageWindow : Form
        {
            public MessageWindow()
            {
                _wnd = this;
                _hwnd = this.Handle;
                _windowReadyEvent.Set();
            }
 
            protected override void WndProc(ref Message m)
            {
                if (m.Msg == WM_HOTKEY)
                {
                    HotKeyEventArgs e = new HotKeyEventArgs(m.LParam);
                    HotKeyHelper.OnHotKeyPressed(e);
                }
 
                base.WndProc(ref m);
            }
 
            protected override void SetVisibleCore(bool value)
            {
                // Ensure the window never becomes visible
                base.SetVisibleCore(false);
            }
 
            private const int WM_HOTKEY = 0x312;
        }
    }
 
    public class HotKeyEventArgs : EventArgs
    {
        public readonly Keys Key;
        public readonly KeyModifiers Modifiers;
 
        public HotKeyEventArgs(Keys key, KeyModifiers modifiers)
        {
            this.Key = key;
            this.Modifiers = modifiers;
        }
 
        public HotKeyEventArgs(IntPtr hotKeyParam)
        {
            uint param = (uint)hotKeyParam.ToInt64();
            Key = (Keys)((param & 0xffff0000) >> 16);
            Modifiers = (KeyModifiers)(param & 0x0000ffff);
        }
    }

調(diào)用示例

        void RegisterHotKeyTest()
        {
            HotKeyHelper.RegisterHotKey(Keys.B, KeyModifiers.Alt);
            HotKeyHelper.HotKeyPressed += new EventHandler<HotKeyEventArgs>(OnHotKeyPressed);
        }
 
        void OnHotKeyPressed(object sender, HotKeyEventArgs e)
        {
            MessageBox.Show("Alt + B");
        }

執(zhí)行結(jié)果