How to Test Ftp server availability

p3c0

Hi,

Did you check "authenticationRequired":http://qt-project.org/doc/qt-5/qnetworkaccessmanager.html#authenticationRequired ?
Until valid credentials are given the signal is emitted again and again. If I understood you correctly this can be used in your case.

beemaneni

Hi sirop,
The above examples does everything ..i get error from QNetworkReply as "NO ERROR". But i do not want to send that text file and verify the accessibility..
Here we use
@ reply = manager.put(QNetworkRequest(url), data);@
i want to send only the ftp address as
reply = manager.put or get (QNetworkRequest(url));

I am not sure what function to use whether it is get or put or something else..?
Let me give an example like i.e..the way we ping and find the accessibility of a network just with address

Thanks
Bala Beemaneni

sirop

I would then use:
@QNetworkReply * QNetworkAccessManager::get(const QNetworkRequest & request)@

beemaneni

Hi p3c0
That signal emits only if authentication either username or password set mismatches.What i need is i want is on button click need to just login in to ftp server and on another button click logout from ftp server.

beemaneni

hi sirop,
hi i did test that but of no use.Here is my code...
@ QUrl testFtp("ftp://"+server);
testFtp.setUserName(userId);
testFtp.setPassword(password);
testFtp.setPort(21);
request.setUrl(testFtp);

// reply = manager.put(request,testData);
reply = manager.get(request);
connect(reply,SIGNAL(readyRead()),this,SLOT(readData()));
connect(reply,SIGNAL(uploadProgress(qint64,qint64)),this,SLOT(fileTransferProgress(qint64,qint64)));
connect(reply, SIGNAL(error(QNetworkReply::NetworkError)),this, SLOT(slotError(QNetworkReply::NetworkError)));
connect(reply, SIGNAL(sslErrors(QList<QSslError>)),this, SLOT(slotSslErrors(QList<QSslError>)));@

i get the error in Network Error says "202".
i.e: QNetworkReply::ContentOperationNotPermittedError

p3c0

Well then another way would be to try to download file from ftp server. If it exists then on finished signal you should get NoError
Eg:
@
manager->get(QNetworkRequest(QUrl("ftp://ftp.ed.ac.uk/pub/Unix/NT4_PlainPassword.reg")));
...

void MainWindow::replyFinished(QNetworkReply *reply)
{
qDebug() << "Reply: " << reply->error(); //will show 0
}
@

beemaneni

hi dude...
thats not the way i guess.We just have an ip address,user,password.Just we need to ensure whether we are reachable to the server or not..We do not know what are the contents in ftp.So we cant download a file.
So cant we just login or connect to ftp server using QNAM?
What about the QNetworkSession? I could not understand this..can u suggest something else

Thanks for ur interest p3c0

p3c0

Deleted

p3c0

Another way would be to try to connect the server using QTcpSocket as
@
QTcpSocket *socket = new QTcpSocket;
connect(socket,SIGNAL(connected()),this,SLOT(onConnected()));
socket->connectToHost("192.168.1.145",21);
if(!socket->waitForConnected(2000)) {
qDebug() << "Not connected";
socket->abort();
}
@

If it succeeds then onConnected will be called immediately. But not sure if this is the recommended way.

beemaneni

hi ,
we may not have hostnames for all the ftp servers.So may not help much.
yeah using TCP will work.Bt right now i am googling for the QNAM API's which can do that.

Let me know if u get any from QNAM or supporting ones

beemaneni

Hii guys

Any updates on the previous ???
And i would like to add one more to this as..

When the network we try to connect is not in reach it does not give error on time..It takes a lot of time and some times it never returns any error..How do i handle this?
```
 @    connect(reply, SIGNAL(error(QNetworkReply::NetworkError)),this, SLOT(slotError(QNetworkReply::NetworkError)));@
```

i am catching above signal which takes a lot of time...
Are there any best methods?

Thanks

sirop

Try to use QTimer ?

beemaneni

Hi,
i feel there will be a straight way to do it with QNetworkAccessManager or with QNetworkReply.Probably we are missing that..

Thanks