C#定位文件位置并修改字节数据

http://blog.sina.com.cn/s/blog_94a1fe540102ympb.html

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

 

namespace fixMp4

{

    class Program

    {

       static void Main(string[] args)

       {

          Console.WriteLine("hello world!");

           string mp4file = "D:\\fixTool\\cannotPlayCs.mp4";

           FileStream writeStream = File.OpenWrite(mp4file);

           byte[] newData = new byte[4];

           newData[0] = 0x00;

           newData[1] = 0x50;

           newData[2] = 0x00;

           newData[3] = 0x08;

          writeStream.Seek(32, SeekOrigin.Begin);

          writeStream.Write(newData, 0, newData.Length);

          writeStream.Close();

       }

    }

}