uses Printers;

function EnumFontFamilyProc(var lf: TLogFont;
  var tm: TNewTextMetric;
  FontType: integer;
  var Memo: TMemo): integer
{$IFDEF WIN32} stdcall;
{$ELSE}; export;
{$ENDIF}
begin
  Memo.Lines.Add(StrPas(@lf.lfFaceName) +
    #32 + IntToStr(lf.lfHeight));
  result := 1;
end;

function EnumFontFamiliesProc(var lf: TLogFont;
  var tm: TNewTextMetric;
  FontType: integer;
  var Memo: TMemo): integer
{$IFDEF WIN32} stdcall;
{$ELSE}; export;
{$ENDIF}
begin
  if FontType = TRUETYPE_FONTTYPE then
  begin
    Memo.Lines.Add(StrPas(@lf.lfFaceName) + #32 + 'All Sizes');
  end
  else
    EnumFontFamilies(Printer.Handle,
      @lf.lfFaceName,
      @EnumFontFamilyProc,
      LongInt(@Memo));
  result := 1;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  tm: TTextMetric;
  i: integer;
begin
  if PrintDialog1.Execute then
  begin
    EnumFontFamilies(Printer.Handle,
      nil,
      @EnumFontFamiliesProc,
      LongInt(@Memo1));
  end;
end;