QDir()

int main(int argc, char *argv[])
{
    QDir dir(QDir::temp());
    qStdOut() << dir.absolutePath()<<endl;
    QStringList listFiles = dir.entryList();
    for (const QFileInfo& list :listFiles)
    {
        QFile fileToDelete(list.absoluteFilePath());
        qStdOut() <<fileToDelete.fileName()<< endl;
    }
    return 0;
}

QDir dir_r(DIR_Read);
    dir_r.setFilter(QDir::Files | QDir::NoSymLinks);
    QFileInfoList list = dir_r.entryInfoList();
    QFileInfo fileInfo;
    for (int i = 0; i < list.size(); ++i)
    {
        QString APN = fileInfo.absoluteFilePath();
        //some code
    }

int main(int argc, char *argv[])
{
    QDir dir(QDir::temp());
    qStdOut() << dir.absolutePath()<<endl;
    QFileInfoList listFiles = dir.entryInfoList(QDir::Files);
    for (const QFileInfo& list :listFiles)
    {
        QFile fileToDelete(list.absoluteFilePath());
        qStdOut() <<fileToDelete.fileName()<< endl;
    }
    return 0;
}