Win2000下直接讀寫磁盤扇區

原作者姓名 N/A
文章原始出處： http://www.codeguru.com/system/ReadSector.html

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在NT和2000下，通過CreateFile來打開需要讀寫的驅動器，ReadFile、WriteFile來進行磁盤讀寫。

下面的代碼演示了，如何讀寫A驅

/* -----------------------------------------------------

Read Floppy Disk Sector for win NT/2000
reads [numsec] sectors from [head] [track] [sector]

-------------------------------------------------------*/


char* ReadSectors(int head, int sector, int track, int numsec)
{


// getting logical sector from absolute head/track/sector ...
//計算扇區位置
int LogicalSector = (sector-1) +
(head*SECTORSPERTRACK) +
(track*SECTORSPERTRACK*NUMOFHEADS) ;

char *buffer ;
HANDLE hDevice ;


HANDLE hDevice;
char* buffer = (char*)malloc (512*numsec);
strset ( buffer , ' ');
DWORD bytesread ;

// getting a handle to the drive a: using
// CreateFile () function ....
//打開驅動器 \\.\A:
hDevice = CreateFile("\\\\.\\A:",
GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);

if (hDevice == NULL)
{
MessageBox ("Failed !");
return NULL;
}


// setting the file pointer to the start of the
// sector we want to read .
//移動文件指針到需要讀取位置
SetFilePointer (hDevice,
(LogicalSector*512),
NULL,
FILE_BEGIN);

// reading sector(s) ...
//讀數據
if (!ReadFile ( hDevice,
buffer,
512*numsec,
&bytesread,
NULL) )
{
/*
int err;
char error[10];
err=GetLastError ();
itoa (err, error, 10);
MessageBox (error, "Reading sectors ...Failed ");
return NULL ;
*/
}
//關閉
CloseHandle(hDevice);

return buffer ;
}