udp的广播，多播，单播 demo

enum class EMsgType:uint8_t
{
EMSGT_SINGLE,//单播
EMSGT_MULTICAST,//多播
EMSGT_BROADCAST,//广播
};

sendSocket =new QUdpSocket(this);
sendSocket->setSocketOption(QAbstractSocket::MulticastTtlOption, 1);
sendSocket->bind(QHostAddress::AnyIPv4, 0,QUdpSocket::ShareAddress|QUdpSocket::ReuseAddressHint);

void MainWindow::SendUdpData(const QByteArray &SendData, const QHostAddress &ip, quint16 port, EMsgType msgType)
{
cout<<"ip: “< //广播
if(msgType == EMsgType::EMSGT_BROADCAST)
{
cout<<“EMsgType::EMSGT_BROADCAST:” }
else if(msgType == EMsgType::EMSGT_MULTICAST)
{
//多播
sendSocket->joinMulticastGroup(QHostAddress(ip));
cout<<“EMsgType::EMSGT_MULTICAST:” }
else
{
//单播
sendSocket->leaveMulticastGroup(QHostAddress(ip));
cout<<“EMsgType::EMSGT_SINGLE:” }

}