Probleme Fichier C++

bool TUser::readFromFile(std::ifstream &iff)
{
  int numgames;
  char name[255];
  iff>>name;
  if (iff.eof()) return false;
  code = name;
  iff>>numgames;
  if (iff.eof()) return false;
  games.resize(numgames);
  for (int i=0; i<numgames; i++)
  {
	if (iff.eof()) return false;
	iff >> games[i].date;
    iff >> games[i].game;
	iff >> games[i].numgood;
	iff >> games[i].numbad;
   }
   return true;
}


void __fastcall TForm1::BitBtn1Click(TObject *Sender)
{
if (MaskEdit1->Text == "****")
{
  std::ofstream off("users.txt",ios::app);
  String code = Edit1->Text;
  code = code.LowerCase().Trim();
  while (code.Pos(" ")!=0)
  {
   int p = code.Pos(" ");
   code = code.SubString(0,p-1)+code.SubString(p+1,code.Length());
   }

   bool found = false;
   for (unsigned i=0; i<allUsers.size(); i++)
   {
	  if (code==allUsers[i].code)
	  {
       found = true;
	   break;
      }
   }
   if (found)
   {
	MessageBoxA(NULL,"L'utilisateur est déjà dans la base de données - Choisir un autre.", "Ok", 0);
	return;
   }

  off<<code.c_str()<<"\t";
  off<<0<<"\t"<<endl;
  MessageBoxA(NULL,"Utilisateur ajouté avec succès", "Ok", 0);
}
else
{
 MessageBoxA(NULL,"Erreur de mot de passe", "Erreur", 0);
}

}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
 std::ifstream iff("users.txt");
 while (!iff.eof())
 {
   TUser user;
   if (!user.readFromFile(iff)) break;
   allUsers.push_back(user);
 }
}