目录
- 写在前面
- 代码实现
- 调用示例
写在前面
介绍一个验证过的热键注册工具类,使用系统类库user32.dll
中的RegisterHotkey
函数来实现全局热键的注册。
代码实现
[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; www.devze.commessageLoop.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 UnRegisterHotKeyInternahpVGEfl(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; http://www.devze.com _windowReadyEvent.Set(); python} 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 = mopythondifiers; } public HotKeyEventArgs(IntPtr hotKeyParam) { uint param = (uint)hotKeyParam.ToInt64(); Key = (Keys)((param & 0xffff0000) >> 16); Modifiers = (KeyModifiers)(param & 0x0000ffff); } }
调用示例
void RegisterHotKeyTest() { HotKeyHelper.RegisterHotKey(Keys.B, KeyModifiers.Alt); HotKeyHelper.HotKeyPressed += new EventHandler<HotKeyEventArgs>(OnHotKeyPressed); } void OnHotKeyPressed(object sender, HotKeyEventArgs e) { MessageBox.Show("Alt + B"); }
执行结果
如果需要注册成Windows服务在后台运行,需要开启Service的允许与桌面交互选项。
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