Question

嗨，我已经创建了一个监视键盘的程序，如果按下CTRL + Shift + R，则该程序必须开始记录按键并将其写入文本文件。

不幸的是，我的第二部分（监视键和写入文本文件）工作正常，很不幸，我的系统无法检测到是否同时按下了ctrl + Shift + R。我将推销我正在使用的课程以及问题代码

我正在上课的钥匙钩

public class LowLevelKeyboardListener
{
    private const int WH_KEYBOARD_LL = 13;
    private const int WM_KEYDOWN = 0x0100;
    private const int WM_SYSKEYDOWN = 0x0104;

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool UnhookWindowsHookEx(IntPtr hhk);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);

    public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

    public event EventHandler<KeyPressedArgs> OnKeyPressed;

    private LowLevelKeyboardProc _proc;
    private IntPtr _hookID = IntPtr.Zero;

    public LowLevelKeyboardListener()
    {
        _proc = HookCallback;
    }

    public void HookKeyboard()
    {
        _hookID = SetHook(_proc);
    }

    public void UnHookKeyboard()
    {
        UnhookWindowsHookEx(_hookID);
    }

    private IntPtr SetHook(LowLevelKeyboardProc proc)
    {
        using (Process curProcess = Process.GetCurrentProcess())
        using (ProcessModule curModule = curProcess.MainModule)
        {
            return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
        }
    }

    private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN)
        {
            int vkCode = Marshal.ReadInt32(lParam);

            if (OnKeyPressed != null) { OnKeyPressed(this, new KeyPressedArgs(KeyInterop.KeyFromVirtualKey(vkCode))); }
        }

        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }
}

public class KeyPressedArgs : EventArgs
{
    public Key KeyPressed { get; private set; }

    public KeyPressedArgs(Key key)
    {
        KeyPressed = key;
    }
}

我的问题代码未被检测到

 public void _listener_OnKeyPressed(Object sender, KeyPressedArgs e)
    {
        if (e.KeyPressed == Key.LeftCtrl && e.KeyPressed == Key.LeftShift && e.KeyPressed == Key.R)
        {
            if (recording)
            {
                System.Windows.Forms.MessageBox.Show("Recording");
                recording = false;
            }
            else
            {
                System.Windows.Forms.MessageBox.Show("Recording Halted");
                recording = true;
            }                  
        }

我正在使用但可以100％使用的其他一些代码

private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        _listener = new LowLevelKeyboardListener();
        _listener.OnKeyPressed += _listener_OnKeyPressed;

        _listener.HookKeyboard();

        Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
        dlg.ShowDialog();
        pathName = dlg.FileName;
    }

    private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
        _listener.UnHookKeyboard();
    }

我已经测试过该挂钩，并且如果我仅检查是否已按下单个键，但如果我想检查是否已按下多个键，则无法正常工作。

Answer 1

尝试使用

if(Keyboard.IsKeyDown(Key.LeftShift) && Keyboard.IsKeyDown(Key.LeftCtrl) && Keyboard.IsKeyDown(Key.R)){ //do something }

也可能对您有帮助

Capture multiple key downs in C#

KeyHook用于检测同时按下的多个键

1 个答案: