Qt tostdString

Qt 输出文件时string要转到std型,

#include <iostream>

#include <fstream>

#include <sstream>

void io::write_to_file(QString str)

{

    ofstream my_file;

    my_file.open("test.txt");

    my_file << str.toStdString();

    my_file.close();

    return;

        }

输出到console也一样,

QString string;
// do things...
std::cout << string << std::endl;