Размер папки в Qt [дубликат]

Вот так:

quint32 listFolder ( QString path ) {
    QDir currentFolder( path );
    quint32 totalsize = 0;                      
    currentFolder.setFilter( QDir::Dirs | QDir::Files | QDir::NoSymLinks );
    currentFolder.setSorting( QDir::Name ); 
    QFileInfoList folderitems( currentFolder.entryInfoList() );
    foreach ( QFileInfo i, folderitems ) {
        QString iname( i.fileName() );
        if ( iname == "." || iname == ".." || iname.isEmpty() )
            continue;
        if ( i.isDir() )
            totalsize += listFolder( path+"/"+iname );
        else
            totalsize += i.size();
    }
    return totalsize;
}