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request for member ‘c_str’ in ‘info.AppNetInfoExchange_type::inter_nodes’, which is of non-class type ‘opp_string [10]’

Posted on 2015-01-04
Last Modified: 2015-01-05
 In member function ‘virtual void VirtualApplication::handleMessage(cMessage*)’:
src/node/application/VirtualApplication.cc:96:70: error: request for member ‘c_str’ in ‘info.AppNetInfoExchange_type::inter_nodes’, which is of non-class type ‘opp_string [10]’
     fromNetworkLayer(rcvPacket, info.source.c_str(),info.inter_nodes.c_str(2), info.RSSI, info.LQI);


#include "VirtualApplication.h"

void VirtualApplication::initialize()
      /* Get a valid references to the objects of the Resources Manager module
       * the Mobility module and the Radio module, so that we can make direct
       * calls to their public methods
      cModule *parent = getParentModule();
      resMgrModule = check_and_cast <ResourceManager*>(parent->getSubmodule("ResourceManager"));
      mobilityModule = check_and_cast <VirtualMobilityManager*>(parent->getSubmodule("MobilityManager"));
      radioModule = check_and_cast <Radio*>(parent->getSubmodule("Communication")->getSubmodule("Radio"));
      // check that all the pointers are valid
      if (!resMgrModule || !mobilityModule || !radioModule)
            opp_error("\n Virtual App init: Error in geting a valid reference module(s).");

      self = parent->getIndex();
      // create the routing level address using self
      stringstream out; out << self; selfAddress = out.str();

      cpuClockDrift = resMgrModule->getCPUClockDrift();
      disabled = true;

      applicationID = par("applicationID").stringValue(); // make sure par() returns a string
      priority = par("priority");
      packetHeaderOverhead = par("packetHeaderOverhead");
      constantDataPayload = par("constantDataPayload");
      isSink = hasPar("isSink") ? par("isSink") : false;

      double startup_delay = parent->par("startupOffset");
      // Randomize the delay if the startupRandomization is non-zero
      startup_delay += genk_dblrand(0) * (double)parent->par("startupRandomization");

      /* Send the STARTUP message to 1)Sensor_Manager, 2)Commmunication module,
       * 3) Resource Manager, and $)APP (self message) so that the node starts
       * operation. Note that we send the message to the Resource Mgr through
       * the unconnected gate "powerConsumption" using sendDirect()
      sendDelayed(new cMessage("Sensor Dev Mgr [STARTUP]", NODE_STARTUP),
                simTime() +  startup_delay, "toSensorDeviceManager");
      sendDelayed(new cMessage("Communication [STARTUP]", NODE_STARTUP),
                simTime() +  startup_delay, "toCommunicationModule");
      sendDirect(new cMessage("Resource Mgr [STARTUP]", NODE_STARTUP),
                startup_delay, 0, resMgrModule, "powerConsumption");
      scheduleAt(simTime() + startup_delay, new cMessage("App [STARTUP]", NODE_STARTUP));

      /* Latency measurement is optional. An application can define the
       * following two parameters. If they are not defined then the
       * declareHistogram and collectHistogram statement are not called.
      latencyMax = hasPar("latencyHistogramMax") ? par("latencyHistogramMax") : 0;
      latencyBuckets = hasPar("latencyHistogramBuckets") ? par("latencyHistogramBuckets") : 0;
      if (latencyMax > 0 && latencyBuckets > 0)
            declareHistogram("Application level latency, in ms", 0, latencyMax, latencyBuckets);

void VirtualApplication::handleMessage(cMessage * msg)
      int msgKind = msg->getKind();

      if (disabled && msgKind != NODE_STARTUP)
            delete msg;

      switch (msgKind) {

            case NODE_STARTUP:
                  disabled = false;

            case APPLICATION_PACKET:
                  ApplicationPacket *rcvPacket = check_and_cast <ApplicationPacket*>(msg);
                  AppNetInfoExchange_type info = rcvPacket->getAppNetInfoExchange();
                  // If the packet has the correct appID OR the appID is the empty string,
                  // the packet is delivered by calling the app-specific function fromNetworkLayer()
                  if (applicationID.compare(rcvPacket->getApplicationID()) == 0 || applicationID.compare("") == 0) {
                        fromNetworkLayer(rcvPacket, info.source.c_str(),info.inter_nodes.c_str(2), info.RSSI, info.LQI);
                        if (latencyMax > 0 && latencyBuckets > 0)
                              collectHistogram("Application level latency, in ms", 1000 * SIMTIME_DBL(simTime() - info.timestamp));

            case TIMER_SERVICE:

            case SENSOR_READING_MESSAGE:
                  SensorReadingMessage *sensMsg = check_and_cast <SensorReadingMessage*>(msg);


            case MAC_CONTROL_MESSAGE:

            case RADIO_CONTROL_MESSAGE:
                  RadioControlMessage *radioMsg = check_and_cast <RadioControlMessage*>(msg);

            case OUT_OF_ENERGY:
                  disabled = true;

            case DESTROY_NODE:
                  disabled = true;

                  opp_error("Application module received unexpected message");

      delete msg;

void VirtualApplication::finish()

ApplicationPacket* VirtualApplication::createGenericDataPacket(double data, unsigned int seqNum, int size)
      ApplicationPacket *newPacket = new ApplicationPacket("App generic packet", APPLICATION_PACKET);
      if (size > 0) newPacket->setByteLength(size);
      return newPacket;

void VirtualApplication::requestSensorReading(int index)
      // send the request message to the Sensor Device Manager
      SensorReadingMessage *reqMsg =
            new SensorReadingMessage("App to Sensor Mgr: sample request", SENSOR_READING_MESSAGE);

      // We need the index of the vector in the sensorTypes vector
      // to distinguish the self messages for each sensor

      send(reqMsg, "toSensorDeviceManager");

// A function used to send control messages
/*void VirtualApplication::toNetworkLayer(cMessage * msg)
      if (msg->getKind() == APPLICATION_PACKET)
            opp_error("toNetworkLayer() function used incorrectly to send APPLICATION_PACKET without destination Network address");
      send(msg, "toCommunicationModule");
// A function used to send data packets
void VirtualApplication::toNetworkLayer(cPacket * pkt, const char *dst)
      ApplicationPacket *appPkt = check_and_cast <ApplicationPacket*>(pkt);
      appPkt->getAppNetInfoExchange().destination = string(dst);
      appPkt->getAppNetInfoExchange().source = selfAddress;
      appPkt->getAppNetInfoExchange().timestamp = simTime();
      appPkt->getAppNetInfoExchange().inter_nodes[1] = inter_node;
      int size = appPkt->getByteLength();
      if (size == 0)
            size = constantDataPayload;
      if (packetHeaderOverhead > 0) size += packetHeaderOverhead;
      trace() << "Sending [" << appPkt->getName() << "] of size " <<
            size << " bytes to communication layer";
      send(appPkt, "toCommunicationModule");
Question by:govind shinde
LVL 31

Accepted Solution

Zoppo earned 500 total points
ID: 40531262
Hi govind shinde,

I guess the problem is the info.inter_nodes.c_str(2), the compiler complains calling c_str since inter_nodes is not a class type, instead it's a C-style array opp_string [10].

I'm not really sure how this has to be fixed, without knowing the classes I can only guess - I would say you're trying to access the third string of the array (I guess this because you pass an index 2 to the c_str(2) call). If so you can probably solve the problem using something like info.inter_nodes[2].c_str().

If this isn't the case it could help if you post the header(s) where the classes are declared.


Author Closing Comment

by:govind shinde
ID: 40531550
Thanks a lot. It is working pretty good....

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