procedure TForm1.Button1Click(Sender: TObject);
const
  FieldTypes: array[0..16] of string[10] = ('Unknown', 'String', 'Smallint',
    'Integer', 'Word', 'Boolean', 'Float', 'Currency', 'BCD', 'Date', 'Time',
    'DateTime', 'Bytes', 'VarBytes', 'Blob', 'Memo', 'Graphic');
var
  i, nX, nY, nHeight, nWidth: Integer;
  rtxtMetric: TTextMetric;
  s: array[0..3] of string[10];
begin
  with Table1.FieldDefs, Printer do
  begin
    Update;
    PrinterIndex := -1;
    Title := 'Структура ' + Table1.TableName;
    BeginDoc;
    nX := 0;
    nY := 0;
    WinProcs.GetTextMetrics(Canvas.Handle, rtxtMetric);
    nHeight := rtxtMetric.tmHeight;
    nWidth := rtxtMetric.tmAveCharWidth;
    for i := 0 to Count - 1 do
    begin
      s[0] := IntToStr(Items[i].FieldNo) + #9;
      s[1] := Items[i].Name + #9;
      s[2] := FieldTypes[Ord(Items[i].DataType)] + #9;
      s[3] := IntToStr(Items[i].Size);
      Canvas.TextOut(nX, nY, s[0]);
      Inc(nX, Length(s[0]) * nWidth);
      Canvas.TextOut(nX, nY, s[1]);
      Inc(nX, Length(s[1]) * nWidth);
      Canvas.TextOut(nX, nY, s[2]);
      Inc(nX, Length(s[2]) * nWidth);
      Canvas.TextOut(nX, nY, s[3]);
      nX := 0;
      nY := i * nHeight;
    end;
    EndDoc;
  end;
end;