MySql GetString Acess Violation

/*****************************************************
/ INCLUDES
*****************************************************/
#include "stdafx.h"

//#include <stdlib.h>
#include <iostream>
//#include <sstream>
#include <stdexcept>
	
#include "mysql_connection.h"
#include "mysql_driver.h"
	
//#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>


#define EXAMPLE_HOST "localhost:1764"
#define EXAMPLE_USER "Reader"
#define EXAMPLE_PASS "123"
#define EXAMPLE_DB "test"
	
using namespace std;
	
int main(int argc, const char **argv)
{	
    cout << "Connector/C++ testing No1..." << endl;
    cout << endl;

	
    try {
	
		//On instancie le driver et la connexion
		sql::mysql::MySQL_Driver *driver;  //Le driver????
		sql::Connection *con; //La connexion à la BD
		sql::Statement *stmt; //La requête SQL à executer
		sql::ResultSet *res; //Son résultât

		//On se connecte
		driver = sql::mysql::get_mysql_driver_instance();
		con = driver->connect(EXAMPLE_HOST, EXAMPLE_USER ,EXAMPLE_PASS);
		con->setSchema("test"); //La bd s'appelle test

		stmt = con->createStatement();
		res = stmt->executeQuery("SELECT * FROM utilisateurs");

		std::string usrName;
		std::string mp;

		while (res->next())
		{
			usrName = res->getString("UsrName"); //ICI ÇA PLANTE!!!!
			mp = res->getString("MpPasse");
			cout << "Nom: "<<usrName << " - Mot de passe" << mp << std::endl;;
		}
		delete res;
		delete stmt;
		delete con;

    } catch (sql::SQLException &e) {
        /*
          The MySQL Connector/C++ throws three different exceptions:
	
          - sql::MethodNotImplementedException (derived from sql::SQLException)
          - sql::InvalidArgumentException (derived from sql::SQLException)
          - sql::SQLException (derived from std::runtime_error)
        */
        cout << "# ERR: SQLException in " << __FILE__;
        cout << "(" << __FUNCTION__ << ") on line " << __LINE__ << endl;
        /* Use what() (derived from std::runtime_error) to fetch the error message */
        cout << "# ERR: " << e.what();
        cout << " (MySQL error code: " << e.getErrorCode();
        cout << ", SQLState: " << e.getSQLState() << " )" << endl;
		system("pause");
        return EXIT_FAILURE;
    }
	
    cout << "Fait." << endl;
    return EXIT_SUCCESS;
}

 #if _ITERATOR_DEBUG_LEVEL == 2
	if (_Myproxy != 0)
		{	// proxy allocated, drain it
		_Lockit _Lock(_LOCK_DEBUG);

		for (_Iterator_base12 **_Pnext = &_Myproxy->_Myfirstiter;
	/*JUSTE ICI*/	*_Pnext != 0; *_Pnext = (*_Pnext)->_Mynextiter)
			(*_Pnext)->_Myproxy = 0;
		_Myproxy->_Myfirstiter = 0;
		}
 #endif /* _ITERATOR_DEBUG_LEVEL == 2 */