Delphi获取硬盘ID

//获得硬盘序列号
function GetHDID: pchar;
const IDENTIFY_BUFFER_SIZE = 512;
type
  TIDERegs = packed record
    bFeaturesReg: BYTE; // Used for specifying SMART "commands".
    bSectorCountReg: BYTE; // IDE sector count register
    bSectorNumberReg: BYTE; // IDE sector number register
    bCylLowReg: BYTE; // IDE low order cylinder value
    bCylHighReg: BYTE; // IDE high order cylinder value
    bDriveHeadReg: BYTE; // IDE drive/head register
    bCommandReg: BYTE; // Actual IDE command.
    bReserved: BYTE; // reserved for future use. Must be zero.
  end;
  TSendCmdInParams = packed record
    // Buffer size in bytes
    cBufferSize: DWORD;
    // Structure with drive register values.
    irDriveRegs: TIDERegs;
    // Physical drive number to send command to (0,1,2,3).
    bDriveNumber: BYTE;
    bReserved: array[0..2] of BYTE;
    dwReserved: array[0..3] of DWORD;
    bBuffer: array[0..0] of BYTE; // Input buffer.
  end;
  TIdSector = packed record
    wGenConfig: Word;
    wNumCyls: Word;
    wReserved: Word;
    wNumHeads: Word;
    wBytesPerTrack: Word;
    wBytesPerSector: Word;
    wSectorsPerTrack: Word;
    wVendorUnique: array[0..2] of Word;
    sSerialNumber: array[0..19] of CHAR;
    wBufferType: Word;
    wBufferSize: Word;
    wECCSize: Word;
    sFirmwareRev: array[0..7] of CHAR;
    sModelNumber: array[0..39] of CHAR;
    wMoreVendorUnique: Word;
    wDoubleWordIO: Word;
    wCapabilities: Word;
    wReserved1: Word;
    wPIOTiming: Word;
    wDMATiming: Word;
    wBS: Word;
    wNumCurrentCyls: Word;
    wNumCurrentHeads: Word;
    wNumCurrentSectorsPerTrack: Word;
    ulCurrentSectorCapacity: DWORD;
    wMultSectorStuff: Word;
    ulTotalAddressableSectors: DWORD;
    wSingleWordDMA: Word;
    wMultiWordDMA: Word;
    bReserved: array[0..127] of BYTE;
  end;
  PIdSector = ^TIdSector;
  TDriverStatus = packed record
    // 驱动器返回的错误代码，无错则返回0
    bDriverError: BYTE;
    // IDE出错寄存器的内容，只有当bDriverError 为 SMART_IDE_ERROR 时有效
    bIDEStatus: BYTE;
    bReserved: array[0..1] of BYTE;
    dwReserved: array[0..1] of DWORD;
  end;
  TSendCmdOutParams = packed record
    // bBuffer的大小
    cBufferSize: DWORD;
    // 驱动器状态
    DriverStatus: TDriverStatus;
    // 用于保存从驱动器读出的数据的缓冲区，实际长度由cBufferSize决定
    bBuffer: array[0..0] of BYTE;
  end;
var
  hDevice: Thandle;
  cbBytesReturned: DWORD;
  SCIP: TSendCmdInParams;
  aIdOutCmd: array[0..(sizeof(TSendCmdOutParams) + IDENTIFY_BUFFER_SIZE - 1) - 1] of BYTE;
  IdOutCmd: TSendCmdOutParams absolute aIdOutCmd;
  procedure ChangeByteOrder(var Data; Size: Integer);
  var
    ptr: pchar;
    i: Integer;
    c: CHAR;
  begin
    ptr := @Data;
    for i := 0 to (Size shr 1) - 1 do begin
      c := ptr^;
      ptr^ := (ptr + 1)^;
      (ptr + 1)^ := c;
      Inc(ptr, 2);
    end;
  end;
begin
  Result := ''; // 如果出错则返回空串
  if SysUtils.Win32Platform = VER_PLATFORM_WIN32_NT then begin // Windows NT, Windows 2000
    // 提示! 改变名称可适用于其它驱动器，如第二个驱动器： '\\.\PhysicalDrive1\'
    hDevice := CreateFile('\\.\PhysicalDrive0', GENERIC_READ or GENERIC_WRITE,
      FILE_SHARE_READ or FILE_SHARE_WRITE, nil, OPEN_EXISTING, 0, 0);
  end else // Version Windows 95 OSR2, Windows 98
    hDevice := CreateFile('\\.\SMARTVSD', 0, 0, nil, CREATE_NEW, 0, 0);
  if hDevice = INVALID_HANDLE_VALUE then Exit;
  try
    FillChar(SCIP, sizeof(TSendCmdInParams) - 1, #0);
    FillChar(aIdOutCmd, sizeof(aIdOutCmd), #0);
    cbBytesReturned := 0;
    // Set up data structures for IDENTIFY command.
    with SCIP do begin
      cBufferSize := IDENTIFY_BUFFER_SIZE;
      // bDriveNumber := 0;
      with irDriveRegs do begin
        bSectorCountReg := 1;
        bSectorNumberReg := 1;
        // if Win32Platform=VER_PLATFORM_WIN32_NT then bDriveHeadReg := $A0
        // else bDriveHeadReg := $A0 or ((bDriveNum and 1) shl 4);
        bDriveHeadReg := $A0;
        bCommandReg := $EC;
      end;
    end;
    if not DeviceIoControl(hDevice, $0007C088, @SCIP, sizeof(TSendCmdInParams) - 1,
      @aIdOutCmd, sizeof(aIdOutCmd), cbBytesReturned, nil) then Exit;
  finally
    CloseHandle(hDevice);
  end;
  with PIdSector(@IdOutCmd.bBuffer)^ do begin
    ChangeByteOrder(sSerialNumber, sizeof(sSerialNumber));
    (pchar(@sSerialNumber) + sizeof(sSerialNumber))^ := #0;
    Result := pchar(@sSerialNumber);
  end;
end;