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调用Win32 API(优先级最高,全局监听, 支持最小化失焦等情况)
那么,假如我要在一个WPF程序监听CTRL+5按键,首先在主窗口程序添加以下代码:- /// <summary>
- /// CTRL+5事件Id
- /// </summary>
- private const int Ctrl5KeyEventId = 9000;
- [DllImport("user32.dll")]
- public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
- [DllImport("user32.dll")]
- public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
- protected override void OnSourceInitialized(EventArgs e)
- {
- base.OnSourceInitialized(e);
- var handle = new WindowInteropHelper(this).Handle;
- var source = HwndSource.FromHwnd(handle);
- source?.AddHook(HwndHook);
- //真正注册快捷键监听处理: 同时注册数字键和小键盘的CTRL+5
- RegisterHotKey(handle, Ctrl5KeyEventId, (uint)ModifierKeys.Control, (uint)KeyInterop.VirtualKeyFromKey(Key.D5));
- RegisterHotKey(handle, Ctrl5KeyEventId, (uint)ModifierKeys.Control, (uint)KeyInterop.VirtualKeyFromKey(Key.NumPad5));
- }
- private IntPtr HwndHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
- {
- const int wmHotkey = 0x0312;
- switch (msg)
- {
- case wmHotkey:
- switch (wParam.ToInt32())
- {
- case Ctrl5KeyEventId:
- Debug.WriteLine("Win32监听CTRL+5成功");
- break;
- }
- break;
- }
- return IntPtr.Zero;
- }
- protected override void OnClosing(CancelEventArgs e)
- {
- base.OnClosing(e);
- var handle = new WindowInteropHelper(this).Handle;
- //关闭窗口后取消注册
- UnregisterHotKey(handle, Ctrl5KeyEventId);
- }
复制代码 监听WPF的KeyDown事件(不够清真,可选择,最小化失焦等情况监听失效)
- public MainWindow()
- {
- InitializeComponent();
- KeyDown += MainWindow_KeyDown;
- }
- private void MainWindow_KeyDown(object sender, KeyEventArgs e)
- {
- if (Keyboard.Modifiers == ModifierKeys.Control && (e.Key == Key.D5 || e.Key == Key.NumPad5))
- {
- Debug.WriteLine("WPF的KeyDown事件监听CTRL+5成功"); ;
- e.Handled = true;
- }
- }
复制代码 XAML绑定命令方式(WPF当然优先选中命令绑定啦,清真,最小化失焦等情况监听失效)
以下为Window主窗体的XAML代码- <Window.CommandBindings>
- <CommandBinding Command="{x:Static local:Commands.Ctrl5Command}" Executed="Ctrl5Command_OnExecuted"/>
- </Window.CommandBindings>
- <Window.InputBindings>
- <KeyBinding Modifiers="Control" Key="D5" Command="{x:Static local:Commands.Ctrl5Command}" />
- <KeyBinding Modifiers="Control" Key="NumPad5" Command="{x:Static local:Commands.Ctrl5Command}" />
- </Window.InputBindings>
复制代码 在Window主窗体后台代码创建命令对应的Executed方法- private void Ctrl5Command_OnExecuted(object sender, ExecutedRoutedEventArgs e)
- {
- Debug.WriteLine("WPF的XAML绑定命令监听CTRL+5成功");
- }
复制代码 新增命令相关的静态类:- public static class Commands
- {
- public static ICommand Ctrl5Command { get; } = new RoutedCommand();
- }
复制代码 细节
三个监听方案的优先级
其中Win32 > XAML绑定命令 = KeyDown事件,假如同时监听的话,其中会只处理高优先级的,以上面的例子,假如
我同时监听三个,只会处理win32的全局监听问题
其中win32支持全局监听键盘,也就是窗口在失焦情况下,例如最小化,也能监听得到,其中XAML绑定命令和KeyDown事件不支持失焦情况,最小化等情况也就监听不到了,因此,要按业务选择方案
DEMO
DEMO链接
来源:https://www.cnblogs.com/ryzen/archive/2023/03/20/17235188.html
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