QT display Chinese garbled code

string And QString Conversion between （ The two methods ：fromStdString Direct conversion , perhaps fromLocal8Bit(cstr.c_str())
string str;
QString qstr;

// from QString To std::string
str = qstr.toStdString();

// from std::string To QString
qstr = QString::fromStdString(str);

---

std::string cstr;
QString qstring;

// from std::string To QString
qstring = QString(QString::fromLocal8Bit(cstr.c_str()));

// from QString To std::string
cstr = string((const char *)qstring.toLocal8Bit());

https://blog.csdn.net/hellokandy/article/details/55254071