I am trying to implement FTPClient in using QT Network .
How can i handle exceptional cases like during downloading network cable is unplugged , not internet connection gone etc.. ?
How can my FTPClient can come to know about such event and is there such kind of notification available ?
I have tried to use signals like done(bool) , ommandFinished ( int id, bool error ) but i m not getting any sort of signal.
You seem to use QFtp, which is obsolete. You should use QNetworkReply (and QNetworkAccessManager), which has finished() and error() signals: QNetworkReply documentation.
Have you tried creating a custom SLOT and connecting it to the QNetworkReply error SIGNAL?
You can then inspect the argument to determine the error and decide how you want to deal with it.
QNetworkReply::NoError 0 no error condition. Note: When the HTTP protocol returns a redirect no error will be reported. You can check if there is a redirect with the QNetworkRequest::RedirectionTargetAttribute attribute.
QNetworkReply::ConnectionRefusedError 1 the remote server refused the connection (the server is not accepting requests)
QNetworkReply::RemoteHostClosedError 2 the remote server closed the connection prematurely, before the entire reply was received and processed
QNetworkReply::HostNotFoundError 3 the remote host name was not found (invalid hostname)
QNetworkReply::TimeoutError 4 the connection to the remote server timed out
QNetworkReply::OperationCanceledError 5 the operation was canceled via calls to abort() or close() before it was finished.
QNetworkReply::SslHandshakeFailedError 6 the SSL/TLS handshake failed and the encrypted channel could not be established. The sslErrors() signal should have been emitted.
QNetworkReply::TemporaryNetworkFailureError 7 the connection was broken due to disconnection from the network, however the system has initiated roaming to another access point. The request should be resubmitted and will be processed as soon as the connection is re-established.
QNetworkReply::ProxyConnectionRefusedError 101 the connection to the proxy server was refused (the proxy server is not accepting requests)
QNetworkReply::ProxyConnectionClosedError 102 the proxy server closed the connection prematurely, before the entire reply was received and processed
QNetworkReply::ProxyNotFoundError 103 the proxy host name was not found (invalid proxy hostname)
QNetworkReply::ProxyTimeoutError 104 the connection to the proxy timed out or the proxy did not reply in time to the request sent
QNetworkReply::ProxyAuthenticationRequiredError 105 the proxy requires authentication in order to honour the request but did not accept any credentials offered (if any)
QNetworkReply::ContentAccessDenied 201 the access to the remote content was denied (similar to HTTP error 401)
QNetworkReply::ContentOperationNotPermittedError 202 the operation requested on the remote content is not permitted
QNetworkReply::ContentNotFoundError 203 the remote content was not found at the server (similar to HTTP error 404)
QNetworkReply::AuthenticationRequiredError 204 the remote server requires authentication to serve the content but the credentials provided were not accepted (if any)
QNetworkReply::ContentReSendError 205 the request needed to be sent again, but this failed for example because the upload data could not be read a second time.
QNetworkReply::ProtocolUnknownError 301 the Network Access API cannot honor the request because the protocol is not known
QNetworkReply::ProtocolInvalidOperationError 302 the requested operation is invalid for this protocol
QNetworkReply::UnknownNetworkError 99 an unknown network-related error was detected
QNetworkReply::UnknownProxyError 199 an unknown proxy-related error was detected
QNetworkReply::UnknownContentError 299 an unknown error related to the remote content was detected
QNetworkReply::ProtocolFailure 399 a breakdown in protocol was detected (parsing error, invalid or unexpected responses, etc.)
Some of this error codes are specific to HTTP but others are more generic.
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