Download a single .txt using QFtp - c++

Question

I've got a problem with QFtp. I wanna download a single .txt file with a single line(8 bytes) from my server, so I've written the following code, but it doesn't work.
The file "actions.txt" were created in the folder1 directory. I can see the size of it pretty well in the client-side. But the file is not being written. I'm getting an empty file.
QFile* actionFile = new QFile("action.txt");
QFtp *ftp = new QFtp(parent);
void Dialog::getActionFile()
{
actionFile->open(QIODevice::WriteOnly);
ftp->connectToHost("mydomain.de");
ftp->login("user", "pw");
ftp->cd("folder1");
ftp->get("action.txt",actionFile);
ftp->close();
actionFile->close();
}
Thanks in advance.

Answer 1

The documentation of several methods of QFtp says:
The function does not block and returns immediately. The command is
scheduled, and its execution is performed asynchronously. The function
returns a unique identifier which is passed by commandStarted() and
commandFinished().
So you need to wait for the appropriate signals to be emitted.
Note that you can also use QNetworkRequest to request the whole ftp URL (I think even with username and password inside the URL) to download the file.

Answer 2

I solved my problem.
I treated one step each time the commandFininshed signal was emitted.
like this:
void MainWindow::ftpCommandFinished(int id, bool error)
{
static bool flag = false;
if(ftp->currentCommand() == QFtp::ConnectToHost)
checkUpdate();
if(ftp->currentCommand() == QFtp::Get)
{
file->close();
if(error)
{
QMessageBox::warning(this, "Erro!", ftp->errorString());
deleteLater();
return;
}
if(!flag)
checkVersion();
else{
delete ftp, file;
ftp = 0; file = 0;
}
flag = true;
}
}
the reason of the flag variable is something else that needs further explanations about the program, so i won't go down that road.
Thanks for you help. It somehow helped me a lot.