Ok, I was wrong in my approach of the problem.
I had to use the MulticastInterface to solve my trouble: for UDP
processing, QHostAddress::AnyIPv4 only to bind.
The correct code is (maybe for the next one...) :
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;
}
// Bind to the port
int port = match.captured(2).toInt();
if (!socket->bind( QHostAddress::AnyIPv4 , 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, Local port:
%2.").arg(socket->localAddress().toString()).arg(socket->localPort())
);
}
// 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;
}
// Get the bind address
if ( _bindAddress.isEmpty() )
{
qb::inform("No binding activated. Choose default network
interface.");
}
else
{
QHostAddress bindAddress( _bindAddress );
qb::inform("Bind address: " + bindAddress.toString());
QList<QNetworkInterface> interfaceList =
QNetworkInterface::allInterfaces();
bool done = false;
foreach( const QNetworkInterface& iface, interfaceList )
{
if ( iface.allAddresses().contains( bindAddress) )
{
qb::inform( QString( "%1 interface selected." ).arg(
bindAddress.toString() ));
socket->setMulticastInterface( iface );
done = true;
break;
}
}
if (!done)
{
qb::warn("Binding failed, check your network settings.");
}
}
// 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)));
2014-10-31 22:07 GMT+01:00 Thiago Macieira <thiago.macie...@intel.com>:
> On Thursday 30 October 2014 15:43:23 Jean-Nicolas Artaud wrote:
> > 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).
>
> Run strace on your application and tell us what system calls it made to
> that
> address. We're looking for a socket(2) call, a bind(2) call and a
> setsockopt(2) call.
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
> Software Architect - Intel Open Source Technology Center
>
> _______________________________________________
> Interest mailing list
> Interest@qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
>
--
Jean-Nicolas
_______________________________________________
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
