while migrating a Qt5 project to Qt6 I ran into the problem – QFtp is gone and QNetworkAccessManager apparently doesn't do FTP anymore. I needed to talk to an embedded PLC over FTP and couldn't find anything that was CMake-ready and covered the commands I needed, so I ended up writing my own.

The API is queue-based and signal-driven like the old QFtp, but it's not a drop-in replacement – URLs are used instead of separate host/port parameters, and credentials are passed via QUrl rather than a dedicated login call.

auto *ftp = new QFtpCompat(this);

connect(ftp, &QFtpCompat::commandFinished, this, [ftp](int, bool error) {
    if (error) qWarning() << ftp->errorString();
});
connect(ftp, &QFtpCompat::listInfo, this, [](const QFtpCompatDirEntry &e) {
    qDebug() << e.name() << e.size();
});

ftp->open(QUrl("ftp://user:pass@192.168.1.1/"));
ftp->list(QUrl("ftp://192.168.1.1/data/"));

QByteArray buf;
ftp->get(QUrl("ftp://192.168.1.1/data/config.cfg"), &buf);
ftp->put(QUrl("ftp://192.168.1.1/data/config.cfg"), buf);

Explicit FTPS (AUTH TLS) and Implicit FTPS are supported as well:

ftp->open(QUrl("ftps://192.168.1.1/"), QFtpCompat::EncryptionMode::Explicit);
connect(ftp, &QFtpCompat::sslErrors, ftp, &QFtpCompat::ignoreSslErrors);

Posting this as-is – it works for my use case and has a small integration test suite, but hasn't seen much use beyond that. Feedback and PRs welcome.

https://github.com/DeiVadder/QFtpCompat