getline I/O

This should be a fairly simple question, but how do I get a whole line from a file and store it as a string?

This is what I have right now:

Code:

---

int main()
{
        string a = "";
        string b = "";
        string fileName = "";

        cout << "Enter file name (case sensative): ";
        cin.ignore();
        cin >> fileName;
/////////////////////////////////////////////////////////////////////////
//        Input File
/////////////////////////////////////////////////////////////////////////
       
        try {
        ifstream b_file(fileName.c_str());
        b_file >> a;
        b_file.close();

//more stuff...
}

---

All it spits out is the first word though.

Nevermind, I seem to answer a lot of my own questions... :(