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TTermin = class
public
  Text: String;
  Time: TDateTime;
  Fest: Boolean;

  constructor Create(AStunde, AMinute: Integer; AFest: Boolean; AText: String); Overload;
  function getTermin: String;
end;					

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type
  TTermin = class(TObject)
  private
    FText: String;
    FTime: TDateTime;
    FFest: Boolean;
    function GetAsStr: String; // Getter: hier die Daten als eine Zeile liefern
    procedure SetAsStr(const Value: String); // Setter: hier die Daten aus einer Zeile lesen
  public
    constructor Create(AStunde, AMinute: Integer; AFest: Boolean; AText: String);
    function getTermin: String; // was tut das?

    property Text: String read FText write FText;
    property Time: TDateTime read FTime write FTime;
    property Fest: Boolean read FFest write FFest;

    property AsStr: String read GetAsStr write SetAsStr;
  end;					

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procedure TForm2.Button1Click(Sender: TObject);
var
  lStream: TFileStream;
  lLen: LongInt;
  lStr: String;
  lInt: Integer;
begin
  lStream := TFileStream.Create('test.dat', fmCreate);
  try
    lStr := 'hallo';
    lInt := Length(lStr);
    lStream.Write(lInt, SizeOf(lInt));
    lStream.Write(PChar(lStr)^, lInt);
  finally
    lStream.Free;
  end;
end;

procedure TForm2.Button2Click(Sender: TObject);
var
  lStream: TFileStream;
  lLen: LongInt;
  lStr: String;
  lInt: Integer;
begin
  lStream := TFileStream.Create('test.dat', fmOpenRead);
  try
    lStream.Read(lInt, SizeOf(lInt));
    Label1.Caption := IntToStr(lInt);
    SetLength(lStr, lInt);
    lStream.Read(PChar(lStr)^, lInt);
    Label2.Caption := IntToStr(Length(lStr)) + ' - ' + lStr;
  finally
    lStream.Free;
  end;
end;					

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lStream.Write(PChar(lStr)^, lInt * 2);
// ...
lStream.Read(PChar(lStr)^, lInt * 2);