Unity获取系统鼠标

    [DllImport("user32.dll")]
    public static extern bool SetCursorPos(int X, int Y);
    [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
    public static extern void mouse_event(uint dwFlags, uint dx, uint dy, int cButtons, uint dwExtraInfo);
    private const int MOUSEEVENTF_LEFTDOWN = 0x02;
    private const int MOUSEEVENTF_LEFTUP = 0x04;
    private const int MOUSEEVENTF_RIGHTDOWN = 0x08;
    private const int MOUSEEVENTF_RIGHTUP = 0x10;
    private const int MOUSEEVENTF_MOVE = 0x01;
    private const int MOUSEEVENTF_WHEEL = 0x800;
    public void MouseMove(Vector deltaPosition, float speed)
    {
        mouse_event(MOUSEEVENTF_MOVE, (uint)(deltaPosition.x * speed), (uint)(deltaPosition.y * speed), 0, 0);
    }
    public void LeftButtonDown()
    {
        mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0);
    }
    public void LeftButtonUp()
    {
        mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);
    }
    Vector currentMousePosition = Vector.Zero;
    Vector prevFrameMousePosition = Vector.Zero;
    private int currentHandingHandID = -1;
    private bool mouseLeftButtonPressed = false;