delphi Getclass findClass用法

var
  className: string;
 HelperClass: THelperClass;
begin
  Result := nil;


  className := FConfig.ReadString('Configuration', 'className', '');
  if className = '' then
    Exit;


  if GetClass(className) = nil then
    Exit;
HelperClass := THelperClass(FindClass(className));

  Result :=HelperClass.create(FConfig);

end;