QNetworkAccessManager upload to local FTP server

问题:

I can download from the server but I can't upload to it. It uploads the file but it's an empty file.

This is basically what I'm doing:

QString filename="Data.txt";
QFile file( filename );
file.open(QIODevice::ReadWrite);
file.write("HELLO") ;

QUrl urlup("ftp://127.0.0.1/file.txt");
urlup.setPassword("123");
urlup.setUserName("user");
urlup.setPort(21);
QNetworkAccessManager *nam = new QNetworkAccessManager;
QNetworkRequest requp(urlup);
nam->put(requp,&file);
file.close();

but it's not working; just uploads an empty file.

回答1:

Instead of 127.0.0.1 use localhost

Instead of setPort append :PortNumber to url. (For example ftp://localhost:21)

Answer in this link: Putting large size file on FTP using QNetworkAccessManager

回答2:

Try file.flush(); after write.