用mouse_event函数时，相对坐标和绝对坐标有区别吗？绝对坐标是如何计算的？

相对坐标跟绝对坐标肯定是有区别的,主要是看什么对你有用
相对坐标是相对于当前控件的坐标，比如鼠标移到一个按钮内，以这个按钮为起点的坐标
绝对坐标是鼠标相对于显示器屏幕的坐标
绝对坐标获取：System.Windows.Forms.Cursor.Position.X              
System.Windows.Forms.Cursor.Position.Y

原来是这样，如果我想知道一个txt文件的坐标。有什么好的方法吗？

如果真的可以获取txt文件坐标也请告诉我一下我也来学习学习！

文件也有坐标??地址吧

这是我自己写的程序，不过都是用API写的，有没用不引用API的方法。

using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace 句柄_相对坐标_绝对坐标查看器
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //根据坐标获取窗口句柄
        [DllImport("User32")]
        private static extern IntPtr WindowFromPoint(Point Point);

        // 获得窗口矩形
        [DllImport("user32.dll")]
        public static extern int GetWindowRect(IntPtr hWnd, out RECT lpRect);

        // 获得客户区矩形
        [DllImport("user32.dll")]
        public static extern int GetClientRect(IntPtr hWnd, out RECT lpRect);
        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int Left;                             //最左坐标
            public int Top;                             //最上坐标
            public int Right;                           //最右坐标
            public int Bottom;                        //最下坐标
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            int x = Cursor.Position.X;
            int y = Cursor.Position.Y;
            Point p = new Point(x, y);
            IntPtr formHandle = WindowFromPoint(p);//得到窗口句柄
            textBox1.Text = formHandle.ToString();
            textBox2.Text = "X:" + Cursor.Position.X + "," + "Y:" + Cursor.Position.Y;//鼠标所在的坐标
            RECT rw = new RECT();
            RECT rs = new RECT();
            GetWindowRect(formHandle, out rw);//获取句柄窗体的绝对坐标
            GetClientRect(formHandle, out rs);//获取句柄窗体的相对坐标
            textBox3.Text = "起点（"+Convert.ToString(rw.Left)+","+ Convert.ToString(rw.Top)+"),终点（"+ Convert.ToString(rw.Right)+","+ Convert.ToString(rw.Bottom)+")";
            int sx = Cursor.Position.X - rw.Left;
            int sy = Cursor.Position.Y - rw.Top;//计算得到句柄窗体相对坐标的位置,并在textbox4内随鼠标移动而不断显示
            textBox4.Text = "X:" + sx.ToString() + ", Y:" + sy.ToString();
        }

    }
}