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 = ,
Alt = ,
Ctrl = ,
Shift = ,
WindowsKey =
}
/// <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;
}