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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;