场景
wpf窗体运行后,只能捕获当前Active窗体的按键事件,如果要监听windows全局事件,并对当前窗口事件响应.
第一步:导入Winows API
public class Win32 { [DllImport("User32.Dll")] public static extern void SetWindowText(int h, String s); /// <summary> /// 如果函数执行成功,返回值不为0。 /// 如果函数执行失败,返回值为0。要得到扩展错误信息,调用GetLastError。.NET方法:Marshal.GetLastWin32Error() /// </summary> /// <param name="hWnd">要定义热键的窗口的句柄</param> /// <param name="id">定义热键ID(不能与其它ID重复) </param> /// <param name="fsModifiers">标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效</param> /// <param name="vk">定义热键的内容,WinForm中可以使用Keys枚举转换, /// WPF中Key枚举是不正确的,应该使用System.Windows.Forms.Keys枚举,或者自定义正确的枚举或int常量</param> /// <returns></returns> [DllImport("user32.dll", SetLastError = true)] public static extern bool RegisterHotKey( IntPtr hWnd, int id, KeyModifiers fsModifiers, int vk ); /// <summary> /// 取消注册热键 /// </summary> /// <param name="hWnd">要取消热键的窗口的句柄</param> /// <param name="id">要取消热键的ID</param> /// <returns></returns> [DllImport("user32.dll", SetLastError = true)] public static extern bool UnregisterHotKey( IntPtr hWnd, int id ); /// <summary> /// 向全局原子表添加一个字符串,并返回这个字符串的唯一标识符,成功则返回值为新创建的原子ID,失败返回0 /// </summary> /// <param name="lpString"></param> /// <returns></returns> [DllImport("kernel32", SetLastError = true)] public static extern short GlobalAddAtom(string lpString); [DllImport("kernel32", SetLastError = true)] public static extern short GlobalDeleteAtom(short nAtom); /// <summary> /// 定义了辅助键的名称(将数字转变为字符以便于记忆,也可去除此枚举而直接使用数值) /// </summary> [Flags()] public enum KeyModifiers { None = 0, Alt = 1, Ctrl = 2, Shift = 4, WindowsKey = 8 } /// <summary> /// 热键的对应的消息ID /// </summary> public const int WmHotkey = 0x312; }
第二步:注册快捷键
/// <summary> /// 注册快捷集合 /// </summary> readonly Dictionary<string, short> hotKeyDic = new Dictionary<string, short>(); public MainWindow() { InitializeComponent(); this.Loaded += (sender, e) => { var wpfHwnd = new WindowInteropHelper(this).Handle; var hWndSource = HwndSource.FromHwnd(wpfHwnd); //添加处理程序 if (hWndSource != null) hWndSource.AddHook(MainWindowProc); hotKeyDic.Add("Alt-S", Win32.GlobalAddAtom("Alt-S")); hotKeyDic.Add("Alt-D", Win32.GlobalAddAtom("Alt-D")); Win32.RegisterHotKey(wpfHwnd, hotKeyDic["Alt-S"], Win32.KeyModifiers.Alt, (int)System.Windows.Forms.Keys.S); Win32.RegisterHotKey(wpfHwnd, hotKeyDic["Alt-D"], Win32.KeyModifiers.Alt, (int)System.Windows.Forms.Keys.D); }; }
第三步:响应快捷键事件
/// <summary> /// 响应快捷键事件 /// </summary> /// <param name="hwnd"></param> /// <param name="msg"></param> /// <param name="wParam"></param> /// <param name="lParam"></param> /// <param name="handled"></param> /// <returns></returns> private IntPtr MainWindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { case Win32.WmHotkey: { int sid = wParam.ToInt32(); if (sid == hotKeyDic["Alt-S"]) { MessageBox.Show("按下Alt+S"); } else if (sid == hotKeyDic["Alt-D"]) { MessageBox.Show("按下Alt+D"); } handled = true; break; } } return IntPtr.Zero; }
时间: 2024-11-07 06:46:04