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 =;

            MessageBox.Show(len.ToString());

            byte[] buff1 = new byte[len];

            byte[] buff2 = new byte[];

            FileStream fs = new FileStream(res, FileMode.Open);

            fs.Read(buff1, , (int)len);

            fs.Close();

            OppositeByteArray(buff1,ref buff2);

            FileStream fw = new FileStream(res, FileMode.Open);

            for (int i = ; i < ; i++)

            {

                fw.WriteByte(buff2[i]);

            }

            //fw.Write(buff1, 0, (int)len);

            fw.Write(buff1,,(int)len);

            fw.Close();

            fileinfo = new FileInfo(res);

        }

        /// <summary>

        /// 把一个字节数组按位取反，得到一个新的字节数组

        /// </summary>

        /// <param name="inputData"></param>

        /// <param name="outputData"></param>

        public static void OppositeByteArray(byte[] inputData, ref byte[] outputData)

        {

            int len = inputData.Length;

            int temp;

            for (int i = ; 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

            }

        }

    }

}