C++ ifstream working but not ofstream - c++

Question

Basically when I close the program the vectors are put in a txt file and when the program starts it reads from that file.
If I put some information in the txt file and start the program, it works fine (ifstream works)
But I cannot add things to the file/create a file if there is not a file already (ofstream does not work)
Here is my code:
Library::Library()
{
ifstream fin("libBooks.txt");
string inputLine;
if (fin.fail())
{
lastBookIDUsed = 0;
}
getline(fin, inputLine);
lastBookIDUsed = stringToInt(inputLine);
while (!fin.eof())
{
getline(fin, inputLine);
if ((!fin.eof())&&(inputLine.length()!=0))
{
vector<string> token = tokenize(inputLine);
addBook(token[1], token[2], token[3], stringToInt(token[0]), stringToInt(token[4]));
}
else
{
break;
}
}
fin.close();
ifstream finPatron("libPatrons.txt");
string inputLinePatron;
if (finPatron.fail())
{
lastPatronIDUsed = 0;
}
getline(finPatron, inputLinePatron);
lastPatronIDUsed = stringToInt(inputLinePatron);
while (!finPatron.eof())
{
getline(finPatron, inputLinePatron);
if ((!finPatron.eof()) && (inputLinePatron.length() != 0))
{
vector<string> token = tokenize(inputLinePatron);
vector<int> TEMPbooksCheckedOutID;
//Create a vector for the IDs of books this patron has
int numOfBooksCheckedOut = token.size() - 5;
if (numOfBooksCheckedOut < 1)
{
for (int i = 0; i < numOfBooksCheckedOut; i++)
{
TEMPbooksCheckedOutID.push_back(stringToInt(token[4 + i]));
}
}
addPatron(token[1], token[2], token[3], stringToInt(token[0]), TEMPbooksCheckedOutID, stringToInt(token[4 + numOfBooksCheckedOut]));
}
else
{
break;
}
}
finPatron.close();
}
Library::~Library()
{
ofstream fout("libBooks.txt");
if (!fout.is_open())
std::cout << "Could not open libBooks" << endl;
fout << lastBookIDUsed << endl;
vector<Book>::iterator iter;
iter = vBook.begin();
while (iter != vBook.end())
{
if (!(*iter).isDeleted)
{
fout << (*iter).id << " ";
fout << (*iter).name << ";";
fout << (*iter).author << ";";
fout << (*iter).subject << ";";
fout << (*iter).checkOutBy << endl;
}
iter++;
}
fout.close();
ofstream foutPatron("libPatrons.txt");
if (!foutPatron.is_open())
std::cout << "Could not open libPatrons" << endl;
foutPatron << lastPatronIDUsed << endl;
vector<Patron>::iterator iterPatron;
iterPatron = vPatron.begin();
while (iterPatron != vPatron.end())
{
if (!(*iterPatron).isDeleted)
{
foutPatron << (*iterPatron).id << " ";
foutPatron << (*iterPatron).name << ";";
foutPatron << (*iterPatron).phoneNumber << ";";
foutPatron << (*iterPatron).email << ";";
vector<int>::iterator iter2;
iter2 = (*iterPatron).booksCheckedOutID.begin();
while (iter2 != (*iterPatron).booksCheckedOutID.end())
{
foutPatron << (*iter2) << ";";
iter2++;
}
foutPatron << (*iterPatron).hasAtLeastOneBook << endl;
}
iterPatron++;
}
foutPatron.close();
}
Thanks!