1   
2   unit Unit1;
3   
4   interface
5   
6   uses
7     Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
8     Dialogs, StdCtrls;
9   
10  type
11    TForm1 = class(TForm)
12      Button2: TButton;
13      procedure Button2Click(Sender: TObject);
14    private
15      { Private declarations }
16    public
17    function GetHardDiskSerial(const DriveLetter: Char): string;
18      { Public declarations }
19    end;
20  
21  var
22    Form1: TForm1;
23  
24  implementation
25  
26  {$R *.dfm}
27  
28  function TForm1.GetHardDiskSerial(const DriveLetter: Char): string;
29  var 
30    NotUsed:     DWORD;
31    VolumeFlags: DWORD; 
32    VolumeInfo:  array[0..MAX_PATH] of Char; 
33    VolumeSerialNumber: DWORD;
34  begin 
35    GetVolumeInformation(PChar(DriveLetter + ':\'),
36      VolumeInfo, SizeOf(VolumeInfo), @VolumeSerialNumber, NotUsed,
37      VolumeFlags, nil, 0);
38    Result := Format('Label = %s   Volume Serial = %8.8X', [VolumeInfo, 
39  VolumeSerialNumber])
40  end;
41  
42  procedure TForm1.Button2Click(Sender: TObject);
43  begin
44  ShowMessage(GetHardDiskSerial('c'));
45  end;
46  
47  end.