If the dest_addresses parameter contains more than one address, one of them is randomly chosen for each packet.
An address may be given in the dotted decimal notation, or with the module name. (The IPAddressResolver class is used to resolve the address.)
To disable the model, set dest_addresses to "".
The peer can be UDPSink or another UDPBasicApp (it handles received packets exactly like UDPSink).
UDPAppBase: *** void UDPAppBase::bindToPort(int port)
cMessage msg = new cMessage ("UDP_C_BIND", UDP_C_BIND); 建立新 message "msg", 使用 UDP_C_BIND 格式
UDPControlInfo ctrl = new UDPControlInfo (); 建立新 record "ctrl"
ctrl->setSrcPort (port); 將 port 參數設定進 ctrl 的 SrcPort 參數中
msg->setControlInfo (ctrl); 將 ctrl 包進 msg 中的 ControlInfo 參數中
send (msg, "to_udp"); 送到傳輸層的 udp 做處理
void UDPAppBase::sendToUDP(cMessage *msg, int srcPort, const IPvXAddress& destAddr, int destPort)
msg->setKind(UDP_C_DATA); Send message to UDP, with the appropriate control info attached
其他類似 bindToPort ()
UDPSink: void UDPSink::initialize()
WATCH (numReceived); TKenv 中顯示 numReceived 變數
if (port!=-1) bindToPort (port); port 數字正常就將 port 參數繫結到埠號
void UDPSink::handleMessage (cMessage *msg) 處理封包並秀 numReceived 狀態在畫面中
void UDPSink::processPacket (cMessage *msg) 收到封包後刪除，numReceived 數 +1
UDPBaseApp
const char destAddrs = par ("dest_addresses"); 讀入目的位址 cStringTokenizer tokenizer (destAddrs); const char token; while ((token = tokenizer.nextToken ())!=NULL) destAddresses.push_back (IPAddressResolver ().resolve (token)); 解析 string 成可辨識的位址格式
void UDPBasicApp::sendPacket () IPvXAddress destAddr = chooseDestAddr (); 超過一個目的位址時從中選擇隨機目的位址
IPvXAddress UDPBasicApp::chooseDestAddr () { int k = intrand (destAddresses.size ()); destAddresses.size () 即目標位址數量，intrand (n) 從 n 中隨機取一數
return destAddresses[k];
}