QDirListing Class

usingItFlag=QDirListing::IteratorFlag;for(const auto &dirEntry： QDirListing(u"/etc"_s,ItFlag::Recursive)) { (const auto &dirEntry ::再帰的)    qDebug() << dirEntry.filePath();
   // /etc/. // /etc/.. // /etc/X11 // /etc/X11/fs // ...}

UsingF=QDirListing::IteratorFlag；QDirListingdirList(u"/sys"_s、 QStringList{u"scaling_cur_freq"_s},F::FilesOnly|F::Recursive);for(const auto &dirEntry: dirList) { f(dirEntry.file_freq_s},F::FilesOnly|F::Recursive)    QFilef(dirEntry.filePath());if(f.open(QIODevice::ReadOnly))        qDebug() << f.fileName() << f.readAll().trimmed().toDouble() / 1000 << "MHz";
}

using F = QDirListing::IteratorFlag;
const auto flags = F::FilesOnly | F::Recursive;
for (const auto &dirEntry : QDirListing(u"/etc"_s, flags)) {
    // ...
}

using F = QDirListing::IteratorFlag;
const auto flags = F::FilesOnly | F::Recursive | F::ResolveSymlinks;
for (const auto &dirEntry : QDirListing(u"/etc"_s, flags)) {
    // ...
}

using ItFlag = QDirListing::IteratorFlag;
for (const auto &dirEntry : QDirListing(u"/etc"_s, ItFlag::Recursive)) {
    // Faster
    if (dirEntry.fileName().endsWith(u".conf")) { /* ... */ }

    // This works, but might be potentially slower, since it has to construct a
    // QFileInfo, whereas (depending on the implementation) the fileName could
    // be known already
    if (dirEntry.fileInfo().fileName().endsWith(u".conf")) { /* ... */ }
}
using ItFlag = QDirListing::IteratorFlag;
for (const auto &dirEntry : QDirListing(u"/etc"_s, ItFlag::Recursive)) {
    // Both approaches are the same, because DirEntry will have to construct
    // a QFileInfo to get this info (for example, by calling system stat())

    if (dirEntry.size() >= 4'000 /* 4KB */) { /* ...*/ }
    if (dirEntry.fileInfo().size() >= 4'000 /* 4KB */) { /* ... */ }
}