1、多字节编码转QString
多字节转QString QString::fromStdString
QString转多字节 QString::toStdString()
2、unicode编码转转QString
unicode转Qstring QString::fromStdWString
Qstring转unicode QString::toStdWString()
3、utf8编码转转QString
utf8转QString QString::fromUtf8
QString转utf8 QString::toUtf8