Delphi读取硬盘的物理序列号

    因要用到硬盘的物理序列号，从网上找了很多，最终确定使用了以下的一段程序：

function TFrmMain.GetIdeSerialNumber() : PChar; stdcall;
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  // Windows NT, Windows 2000
  begin
    // 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;

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