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QFile file1("file.dat");
file1.open(QIODevice::WriteOnly);
QDataStream out(&file1);
out<<QString("the answer is:");
out<<(qint32)42;
file1.flush();
file1.close();
file1.open(QIODevice::ReadOnly);
QDataStream in(&file1);
QString str;
qint32 a;
in>>str>>a;
qDebug()<<str<<a;
file1.close();