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...