QString与文本文件互操作

// QString与文本文件互操作：#include 
QString s1("ABCD\nEFGH");
QFile file("D:\\Temp\\s1.txt");
if (file.open(QIODevice::WriteOnly | QIODevice::Text))
{
    file.write(s1.toUtf8());
    file.close();
}
if (file.open(QIODevice::ReadOnly | QIODevice::Text))
{
    QString s2 = file.readAll();
    file.close();
}