Question

我正在使用user32.dll中的“RegisterHotKey”注册一个热键按热键将触发一个执行Console.WriteLine（“HOTKEY”）;

的事件

正常工作，但我遇到问题，大约5秒钟后它停止工作。事件不再被触发。通过评论，我将其缩小到1行代码： Process [] p = Process.GetProcessesByName（“notepad”）; 即获取进程名称（名称无关紧要，记事本或任何其他内容）

每秒一次在System.Timers计时器上调用此GetProcessesByName。就像我说的，大约5秒钟后（有时3或4，随机），热键停止工作。

我该如何解决这个问题？

以下是我正在使用的代码（from this website）

这个问题可能与RegisterHotKey的第一个参数有关吗？（一个HWND）我必须有活动表格来注册热键吗？

 public class HotkeyController {

    public HotkeyController() {
        KeyboardHook k = new KeyboardHook();
        k.RegisterHotKey(0, Keys.Subtract);
        k.KeyPressed += new EventHandler<KeyPressedEventArgs>(k_KeyPressed);
    }

    void k_KeyPressed(object sender, KeyPressedEventArgs e) {
        Console.WriteLine("HOTKEY");
    }
}

public sealed class KeyboardHook : IDisposable {
    // Registers a hot key with Windows.
    [DllImport("user32.dll")]
    private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
    // Unregisters the hot key with Windows.
    [DllImport("user32.dll")]
    private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
    /// <summary>
    /// Represents the window that is used internally to get the messages.
    /// </summary>
    private class Window : NativeWindow, IDisposable {
        private static int WM_HOTKEY = 0x0312;

        public Window() {
            // create the handle for the window.
            this.CreateHandle(new CreateParams());
        }

        /// <summary>
        /// Overridden to get the notifications.
        /// </summary>
        /// <param name="m"></param>
        protected override void WndProc(ref Message m) {
            base.WndProc(ref m);

            // check if we got a hot key pressed.
            if (m.Msg == WM_HOTKEY) {
                // get the keys.
                Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF);
                ModifierKeys modifier = (ModifierKeys)((int)m.LParam & 0xFFFF);

                // invoke the event to notify the parent.
                if (KeyPressed != null)
                    KeyPressed(this, new KeyPressedEventArgs(modifier, key));
            }
        }

        public event EventHandler<KeyPressedEventArgs> KeyPressed;

        #region IDisposable Members

        public void Dispose() {
            this.DestroyHandle();
        }

        #endregion
    }

    private Window _window = new Window();
    private int _currentId;

    public KeyboardHook() {
        // register the event of the inner native window.
        _window.KeyPressed += delegate(object sender, KeyPressedEventArgs args) {
            if (KeyPressed != null)
                KeyPressed(this, args);
        };
    }

    /// <summary>
    /// Registers a hot key in the system.
    /// </summary>
    /// <param name="modifier">The modifiers that are associated with the hot key.</param>
    /// <param name="key">The key itself that is associated with the hot key.</param>
    public void RegisterHotKey(ModifierKeys modifier, Keys key) {
        // increment the counter.
        _currentId = _currentId + 1;

        // register the hot key.
        if (!RegisterHotKey(_window.Handle, _currentId, (uint)modifier, (uint)key))
            throw new InvalidOperationException("Couldn’t register the hot key.");
    }

    /// <summary>
    /// A hot key has been pressed.
    /// </summary>
    public event EventHandler<KeyPressedEventArgs> KeyPressed;

    #region IDisposable Members

    public void Dispose() {
        // unregister all the registered hot keys.
        for (int i = _currentId; i > 0; i--) {
            UnregisterHotKey(_window.Handle, i);
        }

        // dispose the inner native window.
        _window.Dispose();
    }

    #endregion
}

/// <summary>
/// Event Args for the event that is fired after the hot key has been pressed.
/// </summary>
public class KeyPressedEventArgs : EventArgs {
    private ModifierKeys _modifier;
    private Keys _key;

    internal KeyPressedEventArgs(ModifierKeys modifier, Keys key) {
        _modifier = modifier;
        _key = key;
    }

    public ModifierKeys Modifier {
        get { return _modifier; }
    }

    public Keys Key {
        get { return _key; }
    }
}

/// <summary>
/// The enumeration of possible modifiers.
/// </summary>
[Flags]
public enum ModifierKeys : uint {
    Alt = 1,
    Control = 2,
    Shift = 4,
    Win = 8
}

Answer 1

感谢Alex，你给了我一个想法，尝试使用一个表格（就像我过去使用的那样），现在它的工作正常。

在我发布的代码中，它构成了一个类似于它的窗口（这是什么以及它与表单有什么不同？） private Window _window = new Window();

或许Process.GetProcesses找到这个“窗口”并杀死它？从而阻止热键工作？谁知道？？我不是大师......

无论如何，我可以做一个看不见的形式，这已经足够了。

这是我正在使用的“热键形式”代码：

public partial class HotkeyForm : Form {
    public HotkeyForm() {
        InitializeComponent();

        RegisterHotKey(this.Handle, 0, 0, (int)Keys.Subtract);


    }


    protected override void WndProc(ref Message m) {
        if (m.Msg == 0x0312) {
            switch (m.WParam.ToInt32()) {
                case 0: //numpad minus.
                    //Environment.Exit(0);
                    Console.WriteLine("FORM HOTKEY");
                    break;

            }

        }

        base.WndProc(ref m);
    }


}

在几个Process.Get Process调用之后，热键停止工作

1 个答案: