Question

我想做的是在桌面上创建难以穿透的边缘，以保护“区域”。我正在寻找的是某种类似于鼠标陷阱的方法，但是我不想严格局限于一个矩形，因为它将用于多显示器设置中，在该设置中桌面区域可能不是一个完美的矩形，而我想要隔离的区域可能在中间某处。

我正在使用Gma.System.MouseKeyHook钩住鼠标线，我知道这很难在pinvoke中完成，但是我走了图书馆路线。

到目前为止，我所拥有的是：

    const uint MOUSEEVENTF_ABSOLUTE = 0x8000;
    const uint MOUSEEVENTF_LEFTDOWN = 0x0002;
    const uint MOUSEEVENTF_LEFTUP = 0x0004;
    const uint MOUSEEVENTF_MIDDLEDOWN = 0x0020;
    const uint MOUSEEVENTF_MIDDLEUP = 0x0040;
    const uint MOUSEEVENTF_MOVE = 0x0001;
    const uint MOUSEEVENTF_RIGHTDOWN = 0x0008;
    const uint MOUSEEVENTF_RIGHTUP = 0x0010;
    const uint MOUSEEVENTF_XDOWN = 0x0080;
    const uint MOUSEEVENTF_XUP = 0x0100;
    const uint MOUSEEVENTF_WHEEL = 0x0800;
    const uint MOUSEEVENTF_HWHEEL = 0x01000;

    [DllImport("User32.Dll")]
    public static extern long SetCursorPos(int x, int y);

    [DllImport("user32.dll")]
    static extern void mouse_event(uint dwFlags, int dx, int dy, uint dwData, int dwExtraInfo);

    private IKeyboardMouseEvents m_GlobalHook;

    public MainWindow()
    {
        InitializeComponent();

        m_GlobalHook = Hook.GlobalEvents();
        m_GlobalHook.MouseMove += M_GlobalHook_MouseMove;
    }

    private void M_GlobalHook_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
    {
        if (e.X < 0)
        {
            //SetCursorPos(0, e.Y);
            //mouse_event((int)MOUSEEVENTF_MOVE | (int)MOUSEEVENTF_ABSOLUTE, 0, e.Y, 0, 0);
            System.Windows.Forms.Cursor.Position = new System.Drawing.Point(0, e.Y);
        }
    }

我面临的问题是鼠标的实际位置，并且光标似乎是抽象的或没有绑在一起，因此我在要避免的区域中的位置和边缘之间来回地出现了奇怪的闪烁。如您所见，我尝试了几种不同的方法，它们的行为都相同。

请注意，为了进行测试和简化，我的测试区域就是X <0的任何东西，这是我的侧面显示器之一。

Answer 1

答案是做一个低级的鼠标钩子，而不是在它要进入该区域时执行CallNextHookEx，而不是我想让鼠标移开，我返回了(IntPtr)1。这样可以平稳地阻止鼠标进入我的禁止进入区域。

代码很混乱，因为它只是一个概念证明，但是有人可以根据需要对其进行修改。

public partial class MainWindow : Window
{
    public static IntPtr _hookID = IntPtr.Zero;
    private static MouseHook.LowLevelMouseProc _proc;

    public MainWindow()
    {
        InitializeComponent();

        _proc = new MouseHook.LowLevelMouseProc(HookCallback);
        _hookID = MouseHook.SetHook(_proc);
    }

    private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0 &&  MouseHook.MouseMessages.WM_MOUSEMOVE == (MouseHook.MouseMessages)wParam)
        {
            MouseHook.MSLLHOOKSTRUCT hookStruct = (MouseHook.MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MouseHook.MSLLHOOKSTRUCT));
            if (hookStruct.pt.x < 0)
            {
                System.Windows.Forms.Cursor.Position = new System.Drawing.Point(0, hookStruct.pt.y);
                return (IntPtr)1;
            }
        }
        return MouseHook.CallNextHookEx(_hookID, nCode, wParam, lParam);
    }
}

class MouseHook
{
    private const int WH_MOUSE_LL = 14;

    public enum MouseMessages
    {
        WM_LBUTTONDOWN = 0x0201,
        WM_LBUTTONUP = 0x0202,
        WM_MOUSEMOVE = 0x0200,
        WM_MOUSEWHEEL = 0x020A,
        WM_RBUTTONDOWN = 0x0204,
        WM_RBUTTONUP = 0x0205
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct POINT
    {
        public int x;
        public int y;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct MSLLHOOKSTRUCT
    {
        public POINT pt;
        public uint mouseData;
        public uint flags;
        public uint time;
        public IntPtr dwExtraInfo;
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr SetWindowsHookEx(int idHook, LowLevelMouseProc 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)]
    public 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);

    [DllImport("kernel32.dll")]
    static extern IntPtr LoadLibrary(string lpFileName);

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

    public static IntPtr SetHook(LowLevelMouseProc proc)
    {
        IntPtr hInstance = LoadLibrary("User32");
        return MouseHook.SetWindowsHookEx(WH_MOUSE_LL, proc, hInstance, 0);
    }
}

全局阻止鼠标进入屏幕区域

1 个答案: