How can I get the file size in directory traversal?

Question

How can I get the size of a file when I am using recursion to look at each file? I'm getting the next error:

project.exe exited with code -1073741819

int dir_size(const QString _wantedDirPath)
{
    long int sizex = 0;
    QFileInfo str_info(_wantedDirPath);
    if (str_info.isDir())
    {
        QDir dir(_wantedDirPath);
        QStringList ext_list;
        dir.setFilter(QDir::Files | QDir::Dirs |  QDir::Hidden | QDir::NoSymLinks);
        QFileInfoList list = dir.entryInfoList();

        for(int i = 0; i < list.size(); ++i)
        {
            QFileInfo fileInfo = list.at(i);
            if ((fileInfo.fileName() != ".") && (fileInfo.fileName() != ".."))
            {
                sizex += (fileInfo.isDir()) ? this->dir_size(fileInfo.path()) : fileInfo.size():
                QApplication::processEvents();
            }
        } 
    } 

    return sizex;
}

Answer 1

Start by cleaning your code a bit.

quint64 dir_size(const QString & str)
{
    quint64 sizex = 0;
    QFileInfo str_info(str);
    if (str_info.isDir())
    {
        QDir dir(str);
        QFileInfoList list = dir.entryInfoList(QDir::Files | QDir::Dirs |  QDir::Hidden | QDir::NoSymLinks | QDir::NoDotAndDotDot);
        for (int i = 0; i < list.size(); ++i)
        {
            QFileInfo fileInfo = list.at(i);
            if(fileInfo.isDir())
            {
                    sizex += dir_size(fileInfo.absoluteFilePath());
            }
            else 
                sizex += fileInfo.size();

        }
    }
    return sizex;
} 

If you want to keep the ui reactive, do the calcul in a separate thread, call processEvent() at each file is a burden. You should also use quint64 ( unsigned long long ) to handle big files ( > 2Go ) But, it's not clear where the crash is.