procedure TMainForm.NewIni(const NomeIni: string);
var F: System.Text;
    i: Byte;
begin
  System.Assign(F, NomeIni);
  System.ReWrite(F);
  System.WriteLn(F, '[Campi_Ordine]');
  for i:=1 to Table1.FieldCount do
    System.WriteLn(F, 'Campo',i,'=',Table1.Fields[i-1].FieldName);
  System.WriteLn(F, '');
  System.WriteLn(F, '[Campi_Size]');
  for i:=1 to Table1.FieldCount do
    System.WriteLn(F, 'Campo',i,'=',Table1.Fields[i-1].DisplayWidth);
  System.Close(F);
end;

procedure TMainForm.SaveIni(const FN: String);
var Ini: TIniFile;
    i: Integer;
begin
  NewIni(FN);
  Ini := TIniFile.Create(FN);
  with Ini do
  begin
    for i:=1 to Table1.FieldCount do
    begin
      S:= Table1.Fields[i-1].FieldName;
      WriteString('Campi_Ordine', 'Campo'+IntToStr(i),
        Table1.Fields[i-1].FieldName);
      WriteInteger('Campi_Size', 'Campo'+IntToStr(i),
        Table1.Fields[i-1].DisplayWidth);
    end;
  end;
  Ini.Free;
end;

procedure TMainForm.LoadIni(const FN: String);
var Ini: TIniFile;
    i: Integer;
    j: Longint;
    S: String;

    function MyReadInteger(const Section, Ident: string): Longint;
    begin
      result := Ini.ReadInteger(Section, Ident, -1);
      if result=-1 then
        raise Exception.Create('Errore nel file di configurazione.');
    end;

    function MyReadString(const Section, Ident: string): String;
    begin
      result := Ini.ReadString(Section, Ident, '');
      if result='' then
        raise Exception.Create('Errore nel file di configurazione.');
    end;

begin
  Ini := TIniFile.Create(FN);
  try
    with Ini do
    begin
      for i:=1 to Table1.FieldCount do
      begin
        S:= MyReadString('Campi_Ordine', 'Campo'+IntToStr(i));
        j:= MyReadInteger('Campi_Size', 'Campo'+IntToStr(i));
        Table1.FieldByName(S).Index := i-1;
        Table1.FieldByName(S).DisplayWidth := j;
      end;
    end;
  finally
    Ini.Free;
  end;
end;