Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


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
Medium Priority
Last Modified: 2015-01-05
 In member function ‘virtual void VirtualApplication::handleMessage(cMessage*)’:
src/node/application/ 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 (>getApplicationID()) == 0 ||"") == 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
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 31

Accepted Solution

Zoppo earned 2000 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....

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

722 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question