在omnet++/INET中,我有两个节点(Standardhost),通过扩展UDPBasicApp应用程序,我必须将传感器值发送到另一个节点。我做了自己的.msg
定义,如下所示:
class PlantPacket extends FieldsChunk
{
double sensorValue;
}
发送这个值没有问题,我使用了这个代码:
void MyUdp::sendPacket()
{
std::ostringstream str;
str << packetName << "-" << numSent;
Packet *packet = new Packet(str.str().c_str());
const auto& payload = makeShared<PlantPacket>();
payload->setChunkLength(B(par("messageLength")));
payload->setSensorValue(sensorValue);
payload->addTag<CreationTimeTag>()->setCreationTime(simTime());
packet->insertAtBack(payload);
L3Address destAddr = chooseDestAddr();
socket.sendTo(packet, destAddr, destPort);
}
我的问题是在接收节点中检索sensorValue
。我使用了这个代码,但是我得到了一个错误:
void MyUdp::processPacket(Packet *pk)
{
EV_INFO << "Received packet: " << UdpSocket::getReceivedPacketInfo(pk) << endl;
PlantPacket* payload = check_and_cast<PlantPacket*>(pk);
EV_INFO << "packet content1: " << payload->getSensorValue() << endl;
delete pk;
}
错误:不能在整数单位之间转换——in module (inet::Udp)
我该如何解决这个问题?
使用insertAtBack
添加有效载荷,因此必须使用peekAtBack
或popAtBack
获得有效载荷。代码应该如下所示:
void MyUdp::processPacket(Packet *pk)
{
EV_INFO << "Received packet: " << UdpSocket::getReceivedPacketInfo(pk) << endl;
const auto& payload = pk->peekAtBack<PlantPacket>();
EV_INFO << "packet content1: " << payload->getSensorValue() << endl;
delete pk;
}