imx6dl開發板，linux4.9+qt5.8環境，呼叫joinMulticastGroup回傳false，列印的socket->error()是QAbstractSocket::UnknownSocketError。 以下是代碼。有人知道回傳false的原因嗎? bool result = false; m_udpsocket_recive = new QUdpSocket(this); QHostAddress mcast_addr("224.0.0.17"); result = m_udpsocket_recive->bind(QHostAddress::AnyIPv4,45454, QUdpSocket::ReuseAddressHint); qDebug()<<"Phone_Init1 result"<<result; qDebug()<<"Phone_Init1 "<<m_udpsocket_recive->error(); qDebug()<<"Phone_Init1 "<<m_udpsocket_recive->state(); result = m_udpsocket_recive->joinMulticastGroup(mcast_addr); qDebug()<<"Phone_Init result"<<result; qDebug()<<"Phone_Init "<<m_udpsocket_recive->error(); qDebug()<<"Phone_Init "<<m_udpsocket_recive->state(); connect(m_udpsocket_recive, SIGNAL(readyRead()),this, SLOT(RecvDateSlot()));
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