Not work QFtp::put()
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in the "detailed section":https://qt-project.org/doc/qt-4.8/qftp.html#details 2 paragraph it says:
[quote]This class provides a direct interface to FTP that allows you to have more control over the requests. However, for new applications, it is recommended to use QNetworkAccessManager and QNetworkReply, as those classes possess a simpler, yet more powerful API.
[/quote]
AFAIK it is not implemented, but as the quote states, it is recommended to use QNetworkAccessManager anyhow. Furthermore, vsftpd is a Unix/Linux thing, so it might be never part of Qt when it cannot be used cross-platforms.