/*!
Connects to the IP address and port specified by \a address and \a
port. If the connection is established, this function returns true
and the socket enters ConnectedState. Otherwise, false is
returned.
If false is returned, state() should be called to see if the
socket is in ConnectingState. If so, a delayed TCP connection is
taking place, and connectToHost() must be called again later to
determine if the connection was established successfully or
not. The second connection attempt must be made when the socket is
ready for writing. This state can be determined either by
connecting a QSocketNotifier to the socket descriptor returned by
socketDescriptor(), or by calling the blocking function
waitForWrite().
Example:
\snippet doc/src/snippets/code/src_network_socket_qnativesocketengine.cpp 0
Otherwise, error() should be called to determine the cause of the
error.
*/
bool QNativeSocketEngine::connectToHost(const QHostAddress &address, quint16 port)
{
Q_D(QNativeSocketEngine);
Q_CHECK_VALID_SOCKETLAYER(QNativeSocketEngine::connectToHost(), false);
#if defined (QT_NO_IPV6)
if (address.protocol() == QAbstractSocket::IPv6Protocol) {
d->setError(QAbstractSocket::UnsupportedSocketOperationError,
QNativeSocketEnginePrivate::NoIpV6ErrorString);
return false;
}
#endif
if (!d->checkProxy(address))
return false;
Q_CHECK_STATES(QNativeSocketEngine::connectToHost(),
QAbstractSocket::UnconnectedState, QAbstractSocket::ConnectingState, false);
d->peerAddress = address;
d->peerPort = port;
bool connected = d->nativeConnect(address, port);
if (connected)
d->fetchConnectionParameters();
return connected;
}
/*!
Reads up to \a maxSize bytes into \a data from the socket.
Returns the number of bytes read, or -1 if an error occurred.
*/
qint64 QNativeSocketEngine::read(char *data, qint64 maxSize)
{
Q_D(QNativeSocketEngine);
Q_CHECK_VALID_SOCKETLAYER(QNativeSocketEngine::read(), -1);
Q_CHECK_STATES(QNativeSocketEngine::read(), QAbstractSocket::ConnectedState, QAbstractSocket::BoundState, -1);
qint64 readBytes = d->nativeRead(data, maxSize);
// Handle remote close
if (readBytes == 0 && d->socketType == QAbstractSocket::TcpSocket) {
d->setError(QAbstractSocket::RemoteHostClosedError,
QNativeSocketEnginePrivate::RemoteHostClosedErrorString);
close();
return -1;
} else if (readBytes == -1) {
if (!d->hasSetSocketError) {
d->hasSetSocketError = true;
d->socketError = QAbstractSocket::NetworkError;
d->socketErrorString = qt_error_string();
}
close();
return -1;
}
return readBytes;
}
/*!
Connects to the IP address and port specified by \a address and \a
port. If the connection is established, this function returns true
and the socket enters ConnectedState. Otherwise, false is
returned.
If false is returned, state() should be called to see if the
socket is in ConnectingState. If so, a delayed TCP connection is
taking place, and connectToHost() must be called again later to
determine if the connection was established successfully or
not. The second connection attempt must be made when the socket is
ready for writing. This state can be determined either by
connecting a QSocketNotifier to the socket descriptor returned by
socketDescriptor(), or by calling the blocking function
waitForWrite().
Example:
\snippet doc/src/snippets/code/src_network_socket_qnativesocketengine.cpp 0
Otherwise, error() should be called to determine the cause of the
error.
*/
bool QNativeSocketEngine::connectToHost(const QHostAddress &address, quint16 port)
{
Q_D(QNativeSocketEngine);
Q_CHECK_VALID_SOCKETLAYER(QNativeSocketEngine::connectToHost(), false);
if (!d->checkProxy(address))
return false;
Q_CHECK_STATES(QNativeSocketEngine::connectToHost(),
QAbstractSocket::UnconnectedState, QAbstractSocket::ConnectingState, false);
d->peerAddress = address;
d->peerPort = port;
bool connected = d->nativeConnect(address, port);
if (connected)
d->fetchConnectionParameters();
return connected;
}