Compiled C++ program riddled with mojibake?

Question

#include "StdAfx.h"
#include <stdlib.h>
#include <iostream>

#include "mysql_connection.h"

#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>
#include <cppconn/prepared_statement.h>

using namespace std;

int main(void){
    cout << endl;

    try{
        sql::Driver *driver;
        sql::Connection *con;
        sql::Statement *stmt;
        sql::ResultSet *res;
        sql::PreparedStatement *pstmt;

        driver = get_driver_instance();
        con = driver->connect("REMOVED", "REMOVED", "REMOVED");
        con->setSchema("REMOVED");

        stmt = con->createStatement();
        res = stmt->executeQuery("SELECT username FROM player WHERE id=1");

        cout << "Username: " << res->getString("username") << endl;

        delete res;
        delete con;

        cout << "Done.";
        system("pause");

    }catch(sql::SQLException &e){
        cout << "# ERR: SQLException in " << __FILE__;
        cout << "(" << __FUNCTION__ << ") on line " << __LINE__ << endl;
        cout << "# ERR: " << e.what();
        cout << " (MySQL error code: " << e.getErrorCode() << endl;
        cout << ", SQLState: " << e.getSQLState() << " )" << endl;
        system("pause");
    }

    return 0;
}

turns into... https://i.stack.imgur.com/URGiu.png

What's happening? :( This is only my second day working with C++, so forgive my terribly formatted coding and other nooby mistakes. This always shows up right before I get an unhandled exception.

Answer 1

The APIs you are using return std::string objects I believe.

In this case you probably want to add a #include <sstream> to the top of your code so that you have well a defined '<<' operator for the std::string class.

I'm not certain of this solution because I would have expected you to get a compile error that somehow hinted that no operator '<<' could be found.

Try sticking this in your code and calling it from main() right away just to see if the streaming operators are working. Note it will make your program exit.

void SimpleStrings()
{
    std::string str("String in a std::string");
    const char *psz = "const-char-str";
    std::cout << "std::string: " << str << std::endl << "const char *: " << psz << std::endl;
    exit(1);
}