Hello folk !
I've got a trouble I don't understand : the bind on the QUdpSocket doesn't
conplains but I don't receive anything if I put my IP Address in
_bindAddress. So the binding on AnyIPv4 works but not for adresses.
(the soft I'm working on is multi OS (Linux/Windows) I develop and test on
Linux and I can answer your questions as fast as possible, and even try
your suggestions).
Here is my code simplified (I've got log for each failed line, but what
ever) :
QUdpSocket* socket = new QUdpSocket(this);
// Use a regular expression to parse the adress
QRegularExpression re( "^(\\d+.\\d+.\\d+.\\d+):(\\d+)$");
QRegularExpressionMatch match = re.match(address);
if ( !match.hasMatch() )
{
qb::warn( QString("Invalid address %1").arg(address) );
return 0;
}
// Get the bind address
QHostAddress bindAddr( _bindAddress );
if ( _bindAddress.isEmpty() )
{
qb::inform("Use default bind address");
bindAddr = QHostAddress::AnyIPv4;
}
else
{
qb::inform("Bind address: " + bindAddr.toString());
}
// Bind to the port
int port = match.captured(2).toInt();
if (!socket->bind( bindAddr , port, QAbstractSocket::ShareAddress
| QAbstractSocket::ReuseAddressHint ))
{
qb::warn( QString("Not possible to bind to %1:%2 :
%3").arg(_bindAddress).arg(port).arg(socket->errorString()) );
return 0;
}
else
{
qb::inform( QString("Local address: %1, Peer address: %2, Peer
port:
%3, Peer name:
%4.").arg(socket->localAddress().toString()).arg(socket->peerAddress().toString()).arg(socket->peerPort()).arg(socket->peerName())
);
}
// Join the multicast group
QString ipAddress = match.captured(1);
if (!socket->joinMulticastGroup( QHostAddress(ipAddress) ))
{
qb::warn( QString("Cannot join %1 :
%2").arg(ipAddress).arg(socket->errorString()) );
return 0;
}
// IMPORTANT : set the maximum receive buffer size
// Allow to reach high throughput (4Mb/s) without too many lost packets
// Default value does not seem to be good enough
setsockopt(socket->socketDescriptor(), SOL_SOCKET, SO_RCVBUF,
(const char*) &_socketBufferSize, sizeof(int));
qb::inform( QString("Start listening to %1:%2").arg(ipAddress).arg(port) );
connect(socket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()));
connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this,
SLOT(onSocketError(QAbstractSocket::SocketError)));
Many thanks in advance
--
Jean-Nicolas
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