QT读取网卡列表多网卡绑定组播网卡

QList<QNetworkInterface> ifaceList=QNetworkInterface::allInterfaces();
for(int i=0;i<ifaceList.count();i++)
{
    
    
	QNetworkInterface var=ifaceList.at(i);
	ui->comboBox_NIC->addItem(var.humanReadableName());
}

效果图：

初始化时执行了此函数，当网卡发生变化后再次选择网卡可能会导致程序崩溃。所以当网卡发生变化时 需要更新一下。

使用setMulticastInterface(&face)函数来指定网卡
输入IP,绑定输入IP指定网卡，也可以通过选择网卡，直接绑定网卡

int NIC_choice = ui->comboBox_NIC->currentIndex();
int local_port = ui->lineEdit_port->text().toUInt();
QList<QNetworkInterface> netList =  QNetworkInterface::allInterfaces();
int flag = 1;
QList<QNetworkAddressEntry> entryList = netList[NIC_choice].addressEntries();
dst_ip = QHostAddress(ui->lineEdit_IP_dst->text());
dst_port = ui->lineEdit_port_dst->text().toUInt();
foreach(QNetworkAddressEntry entry,entryList)
{
    
    
	qDebug() << QHostAddress(entry.ip()) << endl;
	if(QHostAddress(entry.ip()) == QHostAddress(ui->lineEdit_IP->text()))
	{
    
    
		flag = 0;
		if(udpSocket_net == NULL)
		{
    
    
			udpSocket_net = new QUdpSocket;
			if(true == udpSocket_net->bind(QHostAddress::AnyIPv4, local_port, QAbstractSocket::ShareAddress))// 第一步：绑定
			{
    
    
				udpSocket_net->setMulticastInterface(netList[NIC_choice]);// 第二步：指定网卡
				udpSocket_net->joinMulticastGroup(dst_ip, netList[NIC_choice]);
				udpSocket_net->setSocketOption( udpSocket_net->MulticastLoopbackOption,1);
				udpSocket_net->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption,1024*1024*8);
            	connect(udpSocket_net,SIGNAL(readyRead()),this,SLOT(Device_info_readyRead()));
                ui->pushButton_connect_net->setText("关闭网络");
			}
            else
            {
    
    
            	QMessageBox::critical(this, tr("打开失败"),  tr("端口占用"), QMessageBox::Ok);
                udpSocket_net = NULL;
            }
		}
	}
}
if(flag)
{
    
    
	QMessageBox::critical(this, tr("打开失败"),  tr("IP错误"), QMessageBox::Ok);
}