QStringList lines;
QFile file("in.txt");
if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
return;
while (!file.atEnd()) {
lines.append(file.readLine())
}
or
QFile file("in.txt");
if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
return;
QString str(file.readAll());
QStringList lines = str.split("\n");