>文件粉碎的流程
- 填充文件
- 更改最后使用/创建时间
- 更改名称
- 将大小改为 0 kb
- 删除
using System;
using System.Collections.Generic;
using System.Text;
using System.IO; namespace RocketStudio
{
class ShredFile
{
/// <summary>
/// 文件粉碎选项
/// </summary>
public enum ShredMode
{
/// <summary>
/// 随机数
/// </summary>
RandData,
/// <summary>
/// 指定的Byte
/// </summary>
UserByte,
/// <summary>
/// 指定的字符串
/// </summary>
UserString
}
/// <summary>
/// 将指定的流粉碎使用随机数
/// </summary>
/// <param name="fs">文件流</param>
/// <returns></returns>
public bool Shred(FileStream fs)
{
try
{
BinaryWriter bw = new BinaryWriter(fs);
long fileLength = fs.Length;
long writeBytes = ;
Random random = new Random();
byte[] data = new byte[];
random.NextBytes(data); for (; writeBytes < fileLength; writeBytes += )
{
if (fileLength - writeBytes > )
bw.Write(data);
else bw.Write(data, , (int)(fileLength - writeBytes));
}
fs.Flush();
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 将指定的流粉碎使用指定字符
/// </summary>
/// <param name="fs">文件流</param>
/// <param name="data">字符串</param>
/// <returns></returns>
public bool Shred(FileStream fs, byte data)
{
try
{
BinaryWriter bw = new BinaryWriter(fs);
long fileLength = fs.Length;
long writeBytes = ;
for (; writeBytes < fileLength; writeBytes++)
{
bw.Write(data);
}
fs.Flush();
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 将指定的流粉碎使用指定字符串
/// </summary>
/// <param name="fs">文件流</param>
/// <param name="data">字符串</param>
/// <returns></returns>
public bool Shred(FileStream fs, string data)
{
try
{
BinaryWriter bw = new BinaryWriter(fs);
long fileLength = fs.Length;
long writeBytes = ;
char[] dataArry = new char[data.Length];
for (int ii = ;ii<data.Length;ii++)
{
dataArry[ii] = data[ii];
}
int dataLength = dataArry.Length;
for (; writeBytes < fileLength; writeBytes += dataLength)
{
if ((fileLength - writeBytes) < dataLength)
bw.Write(dataArry);
else bw.Write(dataArry, , dataLength);
}
fs.Flush();
return true;
}
catch
{
return false;
}
}
public void RenameFile(string old, string last)
{
File.Move(old, last);
}
/// <summary>
/// 使用随机数生成文件名
/// </summary>
/// <returns></returns>
private string ReandName()
{
Random random = new Random();
random.Next().ToString();
return random.Next().ToString() + random.Next().ToString() + random.Next().ToString();
}
/// <summary>
/// 开始粉碎
/// </summary>
/// <param name="fileName">文件名</param>
/// <param name="data">填充数据，ShredMode.RandData 将忽略 可为NULL</param>
/// <param name="sm">粉碎文件模式</param>
/// <returns>是否成功</returns>
public bool StartShredFile(string fileName, object data, ShredMode sm, bool IsCleanCreatedDate, bool IsCleanLastUsedDate, bool IsCleanName, bool IsEmptyFile)
{
FileStream fs = null;
try
{
fs = File.Open(fileName, FileMode.Open);
}
catch
{
//error
return false;
}
bool IsSucceed = false;
switch (sm)
{
case ShredMode.RandData:
IsSucceed = Shred(fs);
break;
case ShredMode.UserByte:
IsSucceed = Shred(fs, Convert.ToByte(data));
break;
case ShredMode.UserString:
IsSucceed = Shred(fs, (string)data);
break; }
DateTime dt = new DateTime(,,);
try
{
FileInfo fi = new FileInfo(fileName);
string randName;
if (IsCleanName)
randName = ReandName();
else randName = @"\"+fi.Name; fs.Close();
if(IsEmptyFile)
File.Open(fi.FullName, FileMode.Truncate).Close();
if(IsCleanName)
RenameFile(fi.FullName, fi.DirectoryName + randName);
if(IsCleanCreatedDate)
File.SetCreationTime(fi.DirectoryName + randName, dt);
if (IsCleanLastUsedDate)
{
if(IsCleanName)
File.SetLastWriteTime(fi.DirectoryName + randName, dt);
else
File.SetLastWriteTime(fi.FullName, dt);
}
File.Delete(fi.DirectoryName + randName);
} catch
{
return false;
}
finally { fs.Close(); }
return IsSucceed;
}
} }
>如何使用
| bool StartShredFile(string fileName, object data, ShredMode sm, bool IsCleanCreatedDate, bool IsCleanLastUsedDate, bool IsCleanName, bool IsEmptyFile) |
>>>使用指定方法粉碎文件并删除 string filename ： 文件名 ShredMode sm ： 粉碎的方法(填充数据的类型)(RandData随机数, UserByte指定的字节, UserString指定的字符串) Object data ： 填充的数据(根据ShredMode指定的方法拆箱)可以为string，byte，在ShredMode为RandData时可以为null bool IsCleanCreatedDate ： 是否更改创建日期(指定为2012，12，24) bool IsCleanLastUsedDate ： 是否更改最后使用日期(同上) 返回是否成功 |
| bool Shred(FileStream fs) |
内部方法>>>填充文件(没来得及换名字,也算粉碎吧) 重载 0 将FileStream fs指定的文件填充为随机数 返回是否成功 |
| bool Shred(FileStream fs, byte data) |
内部方法>>>填充文件(没来得及换名字,也算粉碎吧) 重载 1 将FileStream fs指定的文件填充为byte data 的数据 返回是否成功 |
| bool Shred(FileStream fs, string data) |
内部方法>>>填充文件(没来得及换名字,也算粉碎吧) 重载 2 将FileStream fs指定的文件填充为string data 的数据 返回是否成功 |
| 枚举 enum ShredMode | 文件粉碎的方法
随机数 |
引用：http://www.cnblogs.com/1119242459blog/archive/2012/01/29/2331019.html