信息来源：幻影旅团
文章作者：winewind

应该是不可恢复的，因为我是在删除前改写文件内容，最多恢复的也是改写后的内容。标准的做法应该是去系统文件表查询文件的每块具体位置，然后在这些位置上写入垃圾数据。不过太麻烦了，所以找了下面这个折衷的办法。或许有人会说，那我还不如自己动手，先改内容，再保存，再删除。是啊，我的这个程序还真没什么用场。。。。



# include "windows.h"

# include "stdio.h"



#pragma comment(lib, "kernel32.lib")



// Global Variables Declaration

char *pFileName = NULL;

HANDLE hFileDel;



// ERROR Handle Function

void ErrorExit(LPTSTR lpszFunction)

{

TCHAR szBuf[80];

LPVOID lpMsgBuf;

DWORD dw = GetLastError();



FormatMessage(

FORMAT_MESSAGE_ALLOCATE_BUFFER |

FORMAT_MESSAGE_FROM_SYSTEM,

NULL,

dw,

MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

(LPTSTR) &lpMsgBuf,

0, NULL );



wsprintf(szBuf,

"%s failed with error %d: %s",

lpszFunction, dw, lpMsgBuf);



MessageBox(NULL, szBuf, "Error", MB_OK);



LocalFree(lpMsgBuf);

ExitProcess(dw);

}



// Main Function

int main(int argc, char *argv[])

{

if(argc != 2)

{

printf("Command Format: %s filename\n", argv[0]);

return -1;

}



pFileName = argv[1]; // the file to be deleted



// TODO: Open the Target File

hFileDel = CreateFile( pFileName,

GENERIC_READ | GENERIC_WRITE,

0,

NULL,

OPEN_EXISTING,

FILE_ATTRIBUTE_NORMAL,

NULL);

if(hFileDel == INVALID_HANDLE_VALUE) // file can not be opened

{

ErrorExit("CreatFile");

return -1;

}



LPSTR RubbishBuffer;

DWORD dwBytesWritten;

DWORD dwBufferLength;



// TODO: Get File Size

dwBufferLength = GetFileSize(hFileDel, NULL);



// TODO: Construct the Rubbish Buffer

int BufferSize = (int) dwBufferLength;

int i; // loop counter

char RubbishData[BufferSize], *p;

p = RubbishData;

for(i=0; i<BufferSize; i++)

{

*p = 'i';

p++;

}

//printf("the rubbish buffer is: %s\n", RubbishData);



// TODO: Overwrite the Original File with Rubbish Data

if(!WriteFile( hFileDel,

RubbishData,

dwBufferLength,

&dwBytesWritten,

NULL) )

{

ErrorExit("WriteFile Function");

return -1;

}



CloseHandle(hFileDel);



// TODO: Delete the Modified File

if(!DeleteFile(pFileName))

{

ErrorExit("DeleteFile");

return -1;

}



return 1;

}