如何操作系统的文件分配表和文件目录表？？要求编程实现？？

Question

如何操作系统的文件分配表和文件目录表？？要求编程实现？？

Answer 1

太难了，看看以前的DOS编程书吧，如深入DOS编程。

Answer 2

http://www.chinaoak.com/download/sources/system/hardware/bootmaster.zip

Answer 3

int CHardDiskInformation::ReadPhysicalDriveInNT()
{
   int done = FALSE;
   int drive = 0;   for (drive = 0; drive < MAX_IDE_DRIVES; drive++)
   {
      HANDLE hPhysicalDriveIOCTL = 0;         //  Try to get a handle to PhysicalDrive IOCTL, report failure
         //  and exit if can't.
      char driveName [256];      sprintf (driveName, "\\\\.\\PhysicalDrive%d", drive);         //  Windows NT, Windows 2000, must have admin rights
      hPhysicalDriveIOCTL = CreateFile (driveName,
                               GENERIC_READ | GENERIC_WRITE, 
                               FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
                               OPEN_EXISTING, 0, NULL);
      // if (hPhysicalDriveIOCTL == INVALID_HANDLE_VALUE)
      //    printf ("Unable to open physical drive %d, error code: 0x%lX\n",
      //            drive, GetLastError ());      if (hPhysicalDriveIOCTL != INVALID_HANDLE_VALUE)
      {
         GETVERSIONOUTPARAMS VersionParams;
         DWORD               cbBytesReturned = 0;            // Get the version, etc of PhysicalDrive IOCTL
         memset ((void*) &VersionParams, 0, sizeof(VersionParams));         if ( ! DeviceIoControl (hPhysicalDriveIOCTL, DFP_GET_VERSION,
                   NULL, 
                   0,
                   &VersionParams,
                   sizeof(VersionParams),
                   &cbBytesReturned, NULL) )
         {         
            // printf ("DFP_GET_VERSION failed for drive %d\n", i);
            // continue;
         }            // If there is a IDE device at number "i" issue commands
            // to the device
         if (VersionParams.bIDEDeviceMap > 0)
         {
            BYTE             bIDCmd = 0;   // IDE or ATAPI IDENTIFY cmd
            SENDCMDINPARAMS  scip;
            //SENDCMDOUTPARAMS OutCmd; // Now, get the ID sector for all IDE devices in the system.
               // If the device is ATAPI use the IDE_ATAPI_IDENTIFY command,
               // otherwise use the IDE_ATA_IDENTIFY command
            bIDCmd = (VersionParams.bIDEDeviceMap >> drive & 0x10) ? \
                      IDE_ATAPI_IDENTIFY : IDE_ATA_IDENTIFY;            memset (&scip, 0, sizeof(scip));
            memset (IdOutCmd, 0, sizeof(IdOutCmd));            if ( DoIDENTIFY (hPhysicalDriveIOCTL, 
                       &scip, 
                       (PSENDCMDOUTPARAMS)&IdOutCmd, 
                       (BYTE) bIDCmd,
                       (BYTE) drive,
                       &cbBytesReturned))
            {
               DWORD diskdata [256];
               int ijk = 0;
               USHORT *pIdSector = (USHORT *)
                             ((PSENDCMDOUTPARAMS) IdOutCmd) -> bBuffer;               for (ijk = 0; ijk < 256; ijk++)
                  diskdata [ijk] = pIdSector [ijk];               PrintIdeInfo (drive, diskdata);               done = TRUE;
            }
    }         CloseHandle (hPhysicalDriveIOCTL);
      }
   }   return done;
}

Answer 4

如下取得physical Drive的句柄
CreateFile(_T("\\\\.\\PHYSICALDRIVE1"), ...)用DeviceIoControl访问IOCTL_DISK_GET_DRIVE_LAYOUT服务（MSDN上的记载有问题）
BOOL DeviceIoControl(
  (HANDLE) hDevice,             // handle to device
  IOCTL_DISK_GET_DRIVE_LAYOUT,  // dwIoControlCode operation
  NULL,                         // lpInBuffer
  0,                            // nInBufferSize
  (LPVOID) lpOutBuffer,         // input buffer 
  (DWORD) nOutBufferSize,       // size of the input buffer
  (LPDWORD) lpBytesReturned,    // number of bytes returned
  (LPOVERLAPPED) lpOverlapped   // OVERLAPPED structure
);lpOutBuffer是一个 DRIVE_LAYOUT_INFORMATION 结构：
typedef struct _DRIVE_LAYOUT_INFORMATION { 
  DWORD  PartitionCount; 
  DWORD  Signature; 
  PARTITION_INFORMATION  PartitionEntry[];   // A variable-sized array of PARTITION_INFORMATION
} DRIVE_LAYOUT_INFORMATION, *PDRIVE_LAYOUT_INFORMATION; 因为不止一个分区，所以BufferSize要预先分配多一些。

Answer 5

.用Google查把,耐心点.
查的时候注意几个关键字: 硬盘分区表,系统引导区,主引导区,FAT32,NTFS
工具: diskman(diskgen) diskedit 网上有下载.用Google找.