今天写一个小程序中使用到了全局快捷键，找到了我之前写的文章在c#中使用全局快捷键翻了一下，发现它是WinForm版本的，而我现在大部分写WPF程序了，便将其翻译了为WPF版本的了。
static class Hotkey
{
#region 系统api
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool RegisterHotKey(IntPtr hWnd, int id, HotkeyModifiers fsModifiers, uint vk);
[DllImport("user32.dll")]
static extern bool UnregisterHotKey(IntPtr hWnd, int id);
#endregion
/// <summary>
/// 注册快捷键
/// </summary>
/// <param name="window">持有快捷键窗口</param>
/// <param name="fsModifiers">组合键</param>
/// <param name="key">快捷键</param>
/// <param name="callBack">回调函数</param>
public static void Regist(Window window, HotkeyModifiers fsModifiers, Key key, HotKeyCallBackHanlder callBack)
{
var hwnd = new WindowInteropHelper(window).Handle;
var _hwndSource = HwndSource.FromHwnd(hwnd);
_hwndSource.AddHook(WndProc);
int id = keyid++;
var vk = KeyInterop.VirtualKeyFromKey(key);
if (!RegisterHotKey(hwnd, id, fsModifiers, (uint)vk))
throw new Exception("regist hotkey fail.");
keymap[id] = callBack;
}
/// <summary>
/// 快捷键消息处理
/// </summary>
static IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == WM_HOTKEY)
{
int id = wParam.ToInt32();
if (keymap.TryGetValue(id, out var callback))
{
callback();
}
}
return IntPtr.Zero;
}
/// <summary>
/// 注销快捷键
/// </summary>
/// <param name="hWnd">持有快捷键窗口的句柄</param>
/// <param name="callBack">回调函数</param>
public static void UnRegist(IntPtr hWnd, HotKeyCallBackHanlder callBack)
{
foreach (KeyValuePair<int, HotKeyCallBackHanlder> var in keymap)
{
if (var.Value == callBack)
UnregisterHotKey(hWnd, var.Key);
}
}
const int WM_HOTKEY = 0x312;
static int keyid = 10;
static Dictionary<int, HotKeyCallBackHanlder> keymap = new Dictionary<int, HotKeyCallBackHanlder>();
public delegate void HotKeyCallBackHanlder();
}
enum HotkeyModifiers
{
MOD_ALT = 0x1,
MOD_CONTROL = 0x2,
MOD_SHIFT = 0x4,
MOD_WIN = 0x8
}
代码仍然差不多，使用的方式更加简单一点：
protected override void OnSourceInitialized(EventArgs e)
{
Hotkey.Regist(this, HotkeyModifiers.MOD_ALT, Key.T, () =>
{
MessageBox.Show("hello");
});
_context = new MainContext();
this.DataContext = _context;
_context.Process();
}
需要注意的是，调用Hotkey.Regist函数时，需要窗口是分配了句柄的，因此建议在OnLoad事件或OnSourceInitialized函数中进行。
到此这篇关于在WPF中实现全局快捷键功能的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持易知道(ezd.cc)。
