Recursively iterate over all the files in a directory and its subdirectories in Qt

Question

I want to recursively scan a directory and all its sub-directories for files with a given extension - for example, all *.jpg files. How can you do that in Qt?

Answer 1

This should work :

void scanDir(QDir dir)
{
    dir.setNameFilters(QStringList("*.nut"));
    dir.setFilter(QDir::Files | QDir::NoDotAndDotDot | QDir::NoSymLinks);

    qDebug() << "Scanning: " << dir.path();

    QStringList fileList = dir.entryList();
    for (int i=0; i

The differences from your code are the following:

• Breadth first search instead of depth first search (no reason for it, I just prefer it)
• More filters in order to avoid sym links
• EntryList instead of EntryInfoList. You don t need if you just want the name of the file.

I tested it and it works correctly, but notice the following:

• This may take a lot of time, so consider running it from thread
• If there is deep recursion you may have problem with your stack