The QTextStream class provides a convenient interface for reading and writing text.
{
QFile file("test.txt");
if (file.open(QFile::WriteOnly)) {
QTextStream out(&file);
out << "hello world";
file.flush();
file.close();
}
}
{
QFile file("test.txt");
if (file.open(QFile::ReadOnly)) {
QString str;
QTextStream in(&file);
while (!in.atEnd()) {
qDebug() << in.readLine();
}
file.flush();
file.close();
}
}
The QDataStream class provides serialization of binary data for QIODevice.
{
QFile file("file.dat");
if(file.open(QIODevice::WriteOnly)){
QDataStream out(&file);
out << QString("the answer is");
out << (qint32)42;
file.flush();
file.close();
}
}
{
QFile file("file.dat");
if(file.open(QIODevice::ReadOnly)){
QDataStream in(&file);
QString str;
qint32 num;
in >> str >> num;
qDebug() << str << num;
file.flush();
file.close();
}
}