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如何从.NET锁定Windows(如"Windows + L")?

从.NET锁定Windows(如"Windows + L")的方法如下:

  1. 首先,在Visual Studio中创建一个新的C# Windows Forms应用程序。
  2. 在项目中添加一个新的类,命名为“KeyboardHook”。
  3. 在KeyboardHook类中,添加以下代码:
代码语言:csharp
复制
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

public class KeyboardHook
{
    private const int WM_HOTKEY = 0x312;
    private const int MOD_ALT = 0x1;
    private const int MOD_CONTROL = 0x2;
    private const int MOD_SHIFT = 0x4;
    private const int MOD_WIN = 0x8;

    [DllImport("user32.dll")]
    private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);

    [DllImport("user32.dll")]
    private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

    private int key;
    private IntPtr hWnd;
    private int id;

    public event EventHandler HotKeyPressed;

    public KeyboardHook(int key, Keys modifiers, Form form)
    {
        this.key = key;
        this.hWnd = form.Handle;
        id = this.GetHashCode();
        RegisterHotKey();
        form.Disposed += (sender, args) => UnregisterHotKey();
    }

    private void RegisterHotKey()
    {
        if (!RegisterHotKey(hWnd, id, GetModifierFlag(), key))
        {
            throw new ApplicationException("Unable to register hot key.");
        }
    }

    private void UnregisterHotKey()
    {
        UnregisterHotKey(hWnd, id);
    }

    private int GetModifierFlag()
    {
        return 0;
    }

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_HOTKEY && (int)m.WParam == id)
        {
            OnHotKeyPressed();
        }

        base.WndProc(ref m);
    }

    private void OnHotKeyPressed()
    {
        HotKeyPressed?.Invoke(this, EventArgs.Empty);
    }
}
  1. 在主窗体中,添加以下代码:
代码语言:csharp
复制
private KeyboardHook keyboardHook;

private void InitializeKeyboardHook()
{
    keyboardHook = new KeyboardHook(Keys.L, Keys.None, this);
    keyboardHook.HotKeyPressed += (sender, args) => LockWorkStation();
}

[DllImport("user32.dll")]
private static extern bool LockWorkStation();
  1. 在主窗体的构造函数中,调用InitializeKeyboardHook()方法。
代码语言:csharp
复制
public MainForm()
{
    InitializeComponent();
    InitializeKeyboardHook();
}

现在,当您按下"Windows + L"组合键时,系统将锁定屏幕。请注意,这个方法仅适用于Windows操作系统。

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