How do I get Hard-disk serialnumber?

Edited text of question

This is from The Help file called: Borland Technical Informations.
Hope it helps.

Title      : Getting and setting a disks serial numberProduct      : PascalVersion      : AllOS      : DOSDate      : March 13, 1996Number      : 1759

The following program shows how to read and write the serial
number on a disk drive. It uses interrupt $21 function $69
and reads the information back and forth into a record with
the following declaration:

  TSerPacket = record
    Info:Word;
    SerNo: Longint;
    Vol: Array[1..11] of char;
    FileType: Array[1..8] of char;
  end;

The first word of the above record should always contain
zero, the second contains the serial number, the third
the volume label and the fourth the FileType, which is usually

either FAT 16 or FAT 12.

When setting a new serial number, the programs first reads the
current information, and then sets the new serial number
and writes it to disk.

The code shown below provides the user with three functions:

  GetSerialInfo: Get the current serial number
  SetSerialInfo: Set a new serial number
  DisplaySerialInfo: Display the information in the current
                     variable of type TPacket.

Notice that DisplaySerialInfo does not write information

to a disk drive, but only displays that information to
the user via the screen. All of these routines depend
on a global variable of type TSerPacket, which is called
SPacket. It makes no sense to call DisplaySerialInfo
before calling GetSerialInfo.

The drive specification is passed as a number, where
the default drive is zero, drive A is one, drive
B is two, etc.


program SetDiskSer;

{$A+,B-,D+,E+,F-,G+,I+,L+,N-,O-,P-,Q-,R-,S-,T-,V+,X+,Y+}
{$M 16384,0,655360}

type
  TSerPacket = record
    Info:Word;        { Info level always zero }
    SerNo: Longint;   { Disk }
    Vol: Array[1..11] of char;
    FileType: Array[1..8] of char;
  end;

var
  SPacket: TSerPacket;

function GetSerialInfo(Drive: Byte): Byte; assembler;
asm
  mov ah, 69h
  mov al, 0  { This is where you 1 set serial, 0 to get serial
               number }
  mov bl, 1  { drive number 0 = default, 1 = A, 2 = B , 3 = C }
  mov dx, offset [SPacket]

  int 21h
end;


function SetSerialInfo(Drive: Byte; SerNo: LongInt): Boolean;
var
  S: String;
begin
  GetSerialInfo(Drive);
  SPacket.SerNo := SerNo;
  asm
    mov ah, 69h
    mov al, 1  { This is where you 1 set serial, 0 to get serial
                 number }
    mov bl, Drive  { drive number 0 = default, 1 = A, 2 = B ,
                     3 = C }
    mov dx, offset [SPacket]
    int 21h
  end;
end;

procedure DisplaySerialInfo;
var
  S: String;

begin
  WriteLn('Info level: ', SPacket.Info);
  WriteLn('Serial Num: ', SPacket.SerNo);
  FillChar(S, SizeOf(S), #0);
  Move(SPacket.Vol[1], S[1], 11);
  S[0] := #11;
  WriteLn('Vol: ', S);
  FillChar(S, SizeOf(S), #0);
  Move(Spacket.FileType,S[1], 8);
  S[0] := #8;
  WriteLn('Type: ', S);
end;

begin
  SetSerialInfo(1, 12);  { One means Drive A, 16 is the serial
                           number }
  GetSerialInfo(1);
  DisplaySerialInfo;
  ReadLn;
end.

Hi

I don't want to tread on ronit's toes, but the "GetVolumeInformation" Windows API call is a lot easier...   ;-)

Cheers,
JB

Actally you are right JB.
Erik, an example of using GetVolumeInformation can be found in:
http://www.chami.com/tips/delphi/122596D.html

Here is the pascal prototype and little info if you bored from Win32 helps C style:

function GetVolumeInformation(
  lpRootPathName: PChar; // address of root directory of the file system
  lpVolumeNameBuffer: PChar;    // address of name of the volume
  nVolumeNameSize: DWORD;       // length of lpVolumeNameBuffer
  lpVolumeSerialNumber: PDWORD;         // address of volume serial number
  var lpMaximumComponentLength,         // address of system's maximum filename length
  lpFileSystemFlags: DWORD;             // address of file system flags
  lpFileSystemNameBuffer: PChar;        // address of name of file system
  nFileSystemNameSize: DWORD): BOOL;    // length of lpFileSystemNameBuffer

Bye,
Igor

Hi Erik N,
Hi everybody,

This should work : very easy, very simple, and with example :

procedure TForm1.Button1Click(Sender: TObject);
var
  SerialNum : pdword;
  a, b : dword;
  Buffer  : array [0..255] of char;
begin
  if GetVolumeInformation('c:\', Buffer, SizeOf(Buffer), SerialNum, a, b, nil, 0) then
    Label1.Caption := IntToStr(SerialNum^);
end;

Regards, Zif.

Hi Erik,

if you really want to make it in a easy way, don't do it - use a ready component !

http://www.torry.webnorth.com/vcl/filedrv/drives10.zip

or (the one I prefer)

http://sunsite.icm.edu.pl/delphi/ftp/d10free/volin101.zip

And if your goal is distribution protection I can sugest you a complete component that deals with everything you can imagine in this area ,like activation-key generation, time expiration, etc...

IHTH,
Itamar

http://www.torry.webnorth.com/vcl/filedrv/diskcaps.zip
(By Radoslaw Przybyl.
                                This simple component
                                encapsulates two API
                                functions:
                                GetVolumeInformation
                                and GetDriveType. It
                                allows to check:

                                    Drive Volume Label
                                    Drive Serial Number
                                    Drive file system
                                    type
                                    Length of directory
                                    component
                                    Drive System Flags )

Hei !

It was supposed to be a comment !!!!!

Sorry !
Itamar

Thanks to all of you...
I tried Zif's method and it didn't work properly, I don't know why though... (I got "Access violation").

/Erik N