program getpass;
........
type
...
ListBox: TListBox;
procedure getpasswords;
.......
end;

const Count: Integer = 0;

function WNetEnumCachedPasswords(lp: lpStr; w: Word; b: Byte; PC: PChar;
    dw: DWord): Word; stdcall;

implementation

{$R *.DFM}
function WNetEnumCachedPasswords(lp: lpStr; w: Word; b: Byte; PC: PChar;
    dw: DWord): Word; external mpr name 'WNetEnumCachedPasswords';

type
PWinPassword = ^TWinPassword;
TWinPassword = record
   EntrySize: Word;
   ResourceSize: Word;
   PasswordSize: Word;
   EntryIndex: Byte;
   EntryType: Byte;
   PasswordC: Char;
  end;
var
  WinPassword: TWinPassword;

function AddPassword(WinPassword: PWinPassword; dw: DWord): LongBool; stdcall;
var
  Password: String;
  PC: Array[0..$FF] of Char;
begin
  inc(Count);

  Move(WinPassword.PasswordC, PC, WinPassword.ResourceSize);
  PC[WinPassword.ResourceSize] := #0;
  CharToOem(PC, PC);
  Password := StrPas(PC);

  Move(WinPassword.PasswordC, PC, WinPassword.PasswordSize +
       WinPassword.ResourceSize);
  Move(PC[WinPassword.ResourceSize], PC, WinPassword.PasswordSize);
  PC[WinPassword.PasswordSize] := #0;
  CharToOem(PC, PC);
  Password := Password + ': ' + StrPas(PC);

  Form1.ListBox.Items.Add(Password);
  Result := True;
end;

procedure tform1.getpasswords;
var error:string;
begin
  if WNetEnumCachedPasswords(nil, 0, $FF, @AddPassword, 0) <> 0 then
  begin
    error := '不能载入密码:用户未登录。';
  end
  else if Count = 0 then error := '未发现密码...'
end;