ns-3源代码

Question

ns-3用户！我是ns-3的新手请帮我理解一下：http://code.nsnam.org/ns-3-dev/file/tip/examples/wireless/wifi-simple-adhoc-grid.cc

我不能理解这里的某些内容( 209到217行)：

  $ TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");
  Ptr<Socket> recvSink = Socket::CreateSocket (c.Get (sinkNode), tid); //sinkNode=0
  InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 80);
  recvSink->Bind (local);
  recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));
  Ptr<Socket> source = Socket::CreateSocket (c.Get (sourceNode), tid);
  InetSocketAddress remote = InetSocketAddress (i.GetAddress (sinkNode, 0), 80);
  source->Connect (remote);$

这里发生什么事情？仅供参考:附加代码。

求求你帮帮我！谢谢大家！:)

Answer 1

下面注释了源代码。

获取可创建udp套接字的工厂类的唯一id。

TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");

在节点"sinkNode“上实际创建一个udp (不管它是什么)

Ptr<Socket> recvSink = Socket::CreateSocket (c.Get (sinkNode), tid);

将我们刚刚创建的套接字绑定到'any‘ipv4地址

InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 80);
recvSink->Bind (local);

使套接字将其接收到的数据包转发到"ReceivePacket“函数

recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));

在发送节点上创建udp套接字

Ptr<Socket> source = Socket::CreateSocket (c.Get (sourceNode), tid);

将udp套接字连接到接收节点上创建的udp套接字的ip地址和端口号。这只是将通过此套接字发送的数据包的缺省ip地址设置为

InetSocketAddress remote = InetSocketAddress (i.GetAddress (sinkNode, 0), 80);
source->Connect (remote);