如何跟踪鼠标 X/Y 位置并将其打印到标签上？

Question

我从 MSDN 上的示例知道如何修改光标位置。

我的问题是如何在鼠标移动时检查鼠标的位置，然后打印 X 和 Y 位置来表示标签？

编辑：假设我想从整个屏幕跟踪鼠标位置。

编辑 2：我的应用程序将在后台/最小化。

我已经在使用鼠标挂钩：

namespace Program
{
    public partial class MouseHook
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        private static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, IntPtr 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;

        public void DoMouseClick()
        {
            int X = Cursor.Position.X;
            int Y = Cursor.Position.Y;

            IntPtr newP = new IntPtr(Convert.ToInt64("0", 16));
            mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, newP);
        }
    }
}

Answer 1

这里是有关系统级鼠标事件处理调用（低级鼠标过程）的 msdn 文档。

这里是使用低级别的示例鼠标过程改变滚动事件。

在第二个链接的答案中，使用 此处而不是 WM_MOUSEWHEEL。

需要注意的一件事：当鼠标悬停在具有提升权限的程序上时，为了使该程序继续捕获鼠标事件，该程序必须以提升的权限启动。

代码（未测试）：

using System;

using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace CatchMouseMove
{
    class InterceptMouse
    {
        const int INPUT_MOUSE = 0;
        const int MOUSEEVENTF_WHEEL = 0x0800;
        const int WH_MOUSE_LL = 14; 


        private static LowLevelMouseProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;

        public static void Main()
        {
            _hookID = SetHook(_proc);

            if (_hookID == null)
            {
                MessageBox.Show("SetWindowsHookEx Failed");
                return;
            }
            Application.Run();
            UnhookWindowsHookEx(_hookID);
        }

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

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

        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            int xPos = 0;
            int yPos = 0;

            if (nCode >= 0 && MouseMessages.WM_MOUSEMOVE == (MouseMessages)wParam)
            {    
                xPos = GET_X_LPARAM(lParam); 
                yPos = GET_Y_LPARAM(lParam);

                //do stuff with xPos and yPos
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }


        private enum MouseMessages
        {
            WM_MOUSEMOVE = 0x0200
        }

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

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

        public struct INPUT
        {
            public int type;
            public MOUSEINPUT mi;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MOUSEINPUT
        {
            public int dx;
            public int dy;
            public int mouseData;
            public uint dwFlags;
            public int time;
            public int dwExtraInfo;
        }



        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private 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)]
        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);

    }

}

Answer 2

您需要设置一个 Windows 挂钩才能实现此目的。 MSDN 文章如何在 Visual C# .NET 中设置 Windows 挂钩展示了如何设置鼠标钩。

我尝试过，它捕获整个表单上的鼠标，即使鼠标光标位于控件上也是如此。

Answer 3

您可以使用 MouseMove 事件，因为它保存了鼠标坐标。从那里您可以轻松地将标签的文本属性设置为从 e （MouseMove EventArgs）获取的 X 或 Y 坐标。

private void Form_MouseMove(object sender, MouseEventArgs e)
{
    // Update the mouse coordinates displayed in the textbox.
    myTextBox.Text = e.Location.ToString();
}