unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
    buf:array [0..MAX_PATH-1] of char;
    m_Result:Integer;
    i:Integer;
    str_temp:string;
begin
	m_Result:=GetLogicalDriveStrings(MAX_PATH,buf);
    str_temp:=string(buf);
	for i:=0 to (m_Result div 4) do
	begin
        str_temp:=string(buf[i*4]+buf[i*4+1]+buf[i*4+2]);
        ListBox1.Items.Add(str_temp);
	end;
end;

end.