读取硬盘扇区的数据

/*
*  Author: Leng_que
*  Date: 2010年1月8日
*  E-mail: leng_que@yahoo.com.cn
*  Description: 读取指定的某个扇区的内容
*/

#include <Windows.h>
#include <WinIoCtl.h>
#include <stdio.h>
#include <conio.h>

//功能：读取第dw64Index个扇区的内容
int ReadSector(DWORD64 dw64Index)
{
if ( dw64Index<=0 )
{
//非法参数：参数太小
return -1;
}

HANDLE hDevice = CreateFile(
"////.//PHYSICALDRIVE0",  //第0号物理驱动器，即：第一块硬盘
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);

if ( hDevice==INVALID_HANDLE_VALUE )
{
//CreateFile出错
return -2;
}

DWORD dwBytesReturned=0;

//锁定卷
DeviceIoControl(
hDevice,
FSCTL_LOCK_VOLUME,
NULL,
0,
NULL,
0,
&dwBytesReturned,
(LPOVERLAPPED)NULL
);

//获取每扇区字节数信息
DISK_GEOMETRY Geometry={0};
DeviceIoControl(
hDevice,
IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL,
0,
&Geometry,
sizeof(DISK_GEOMETRY),
&dwBytesReturned,
(LPOVERLAPPED)NULL
);

DWORD dwBytesPerSector = Geometry.BytesPerSector;
DWORD64 dw64AllSectorCount = DWORD64(Geometry.Cylinders.QuadPart*Geometry.TracksPerCylinder*Geometry.SectorsPerTrack);
if ( dw64Index > dw64AllSectorCount )
{
//非法参数：参数太大
return -12;
}

//分配进程中的内存堆
PBYTE pbBuff=NULL;
pbBuff = (PBYTE)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwBytesPerSector);
if ( pbBuff==NULL )
{
//HeapAlloc出错
return -3;
}

//读取指定扇区内容
DWORD dwNumberOfBytesRead=0;
DWORD64 dw64Pos = (dw64Index-1)*(DWORD64)dwBytesPerSector;
LARGE_INTEGER li;
li.QuadPart = dw64Pos;

SetFilePointer(hDevice, li.LowPart, &li.HighPart, FILE_BEGIN);
int iRet = ReadFile(hDevice, pbBuff, dwBytesPerSector, &dwNumberOfBytesRead, NULL);
if ( iRet==FALSE || dwNumberOfBytesRead<dwBytesPerSector )
{
//ReadFile出错
return -4;
}

//输出结果
for (DWORD n=0; n<dwBytesPerSector; ++n)
{
printf("0x%02X ", pbBuff
);
}

//释放之前分配的堆
HeapFree(GetProcessHeap(), NULL, pbBuff);
pbBuff = NULL;

//解锁卷
DeviceIoControl(
hDevice,
FSCTL_UNLOCK_VOLUME,
NULL,
0,
NULL,
0,
&dwBytesReturned,
NULL );

CloseHandle(hDevice);

return 0;
}

int main(void)
{
//读取第1个扇区的内容（也就是MBR的内容）
ReadSector(1);

getch();
return 0;
}

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