using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;namespace WindowsFormsApplication9{    public partial class Form1 : Form    {        private string res = "";        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            OpenFileDialog ss = new OpenFileDialog();            if (ss.ShowDialog() == DialogResult.OK)            {                res = ss.FileName;            }            fun();        }        public void fun()        {            FileInfo fileinfo = new FileInfo(res);            long len =160;            MessageBox.Show(len.ToString());            byte[] buff1 = new byte[len];            byte[] buff2 = new byte[160];            FileStream fs = new FileStream(res, FileMode.Open);            fs.Read(buff1, 0, (int)len);            fs.Close();            OppositeByteArray(buff1,ref buff2);            FileStream fw = new FileStream(res, FileMode.Open);            for (int i = 0; i < 160; i++)            {                fw.WriteByte(buff2[i]);            }            //fw.Write(buff1, 0, (int)len);            fw.Write(buff1,0,(int)len);            fw.Close();            fileinfo = new FileInfo(res);         }        /// 
        /// 把一个字节数组按位取反，得到一个新的字节数组        /// 
        ///         ///         public static void OppositeByteArray(byte[] inputData, ref byte[] outputData)        {            int len = inputData.Length;            int temp;            for (int i = 0; i < len; i++)            {                temp = (int)inputData[i];//原字节数组字节转成int型                outputData[i] = (byte)~temp;//取反后赋给输出字节数组            }        }    }}