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Thank you for clarifying that. I was following [kobuki controller wiki page] (http://wiki.ros.org/kobuki/Tutorials/Write

Unable to access publisher in nodelet I am writing a ROS nodelet wrapper class for my existing ROS node. My nodelet is p

I am writing a ROS nodelet in which I have a GetInstance() method. I am trying to parse a string argument and it's throwing me the error. Can someone point out how this error can be fixed?? Any help is appreciated.

Following is the build error -

In file included from /opt/ros/noetic/include/class_loader/class_loader_core.hpp:45,
                 from /opt/ros/noetic/include/class_loader/class_loader.hpp:46,
                 from /opt/ros/noetic/include/pluginlib/./class_list_macros.hpp:40,
                 from /opt/ros/noetic/include/pluginlib/class_list_macros.h:35,
                 from /home/robo/test_ws/src/blob_detect/src/blob_detect/blob_detect_nodelet.cpp:3:
/opt/ros/noetic/include/class_loader/meta_object.hpp: In instantiation of ‘B* class_loader::impl::MetaObject<C, B>::create() const [with C = blob_detect::BlobDetectNodelet; B = nodelet::Nodelet]’:
/opt/ros/noetic/include/class_loader/meta_object.hpp:196:7:   required from here
/opt/ros/noetic/include/class_loader/meta_object.hpp:198:12: error: no matching function for call to ‘blob_detect::BlobDetectNodelet::BlobDetectNodelet()’
  198 |     return new C;
      |            ^~~~~
In file included from /home/robo/test_ws/src/blob_detect/src/blob_detect/blob_detect_nodelet.cpp:1:
/home/robo/test_ws/src/blob_detect/include/blob_detect/blob_detect_nodelet.h:22:3: note: candidate: ‘blob_detect::BlobDetectNodelet::BlobDetectNodelet(const string&)’
   22 |   BlobDetectNodelet(const std::string& cameraName) : nodelet::Nodelet() {}
      |   ^~~~~~~~~~~~~~~~~~~~~~
/home/robo/test_ws/src/blob_detect/include/blob_detect/blob_detect_nodelet.h:22:3: note:   candidate expects 1 argument, 0 provided
make[2]: *** [CMakeFiles/blob_detect.dir/build.make:63: CMakeFiles/blob_detect.dir/src/blob_detect/blob_detect_nodelet.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:183: CMakeFiles/blob_detect.dir/all] Error 2
make: *** [Makefile:141: all] Error 2

My blob_detect_nodelet.h file looks like the following -

#ifndef BLOB_DETECT_NODELET_H
#define BLOB_DETECT_NODELET_H

#include <cv_bridge/cv_bridge.h>
#include <ros/ros.h>
#include <sensor_msgs/Image.h>
#include <sensor_msgs/RegionOfInterest.h>
#include <sensor_msgs/image_encodings.h>
#include <boost/geometry.hpp>
#include <boost/range/irange.hpp>
#include <opencv2/opencv.hpp>
#include "nodelet/nodelet.h"

namespace blob_detect {

class BlobDetectNodelet : public nodelet::Nodelet {
 public:
  BlobDetectNodelet(const std::string& cameraName) : nodelet::Nodelet(){}
  static BlobDetectNodelet& GetInstance(const std::string& cameraName = "");
  inline const cv::Mat GetCurrentImage(void) const { return currentImage; }
  inline void SetCurrentImage(const cv::Mat& image) { currentImage = image; }

 private:
  void onInit() override;
  void imageCb(const sensor_msgs::Image::ConstPtr& msg);
  ros::NodeHandle nh;
  ros::NodeHandle private_nh;
  ros::Subscriber imageSub;
  ros::Publisher roiImagePub;
  const std::string cameraName;
  cv::Mat currentImage;

}

And following is my blob_detect_nodelet.cpp file -

#include <blob_detect/blob_detect_nodelet.h>
#include "pluginlib/class_list_macros.h"

namespace blob_detect {
void BlobDetectNodelet::onInit() {
  nh = getNodeHandle();
  private_nh = getPrivateNodeHandle();

  roiImagePub = nh.advertise<sensor_msgs::Image>("/camera_1/output_image", 100);
  imageSub = nh.subscribe("/camera_1/image_raw", 10, &BlobDetectNodelet::imageCb, this);
}

BlobDetectNodelet& BlobDetectNodelet::getInstance(const std::string& cameraName) {
  static BlobDetectNodelet instance(cameraName);
  return instance;
}

void BlobDetectNodelet::imageCb(const sensor_msgs::Image::ConstPtr& image) {
  cv_bridge::CvImageConstPtr cv_image = cv_bridge::toCvShare(image, "mono8");
}
}  // namespace blob_detect

PLUGINLIB_EXPORT_CLASS(blob_detect::BlobDetectNodelet, nodelet::Nodelet);

GetInstance() method in nodelet I am writing a ROS nodelet in which I have a GetInstance() method. I am trying to parse

Load nodelet from another package Hi I am new to using nodelets. I am using an open source ros driver for a camera which

Is there a way I can write a node to subscribe the log messages from the /rosout topic and save in a HTML file?

I am subscribing to /diagnostics topic, to which all my nodes are publishing their outputs. In my source file, I have created a map of all the node names as follows -

std::map<string, int> TextCode;
TextCode = {{"Camera_node1", 1}, {"LIDAR_node2", 2}};

I have prepopulated the map with few nodes (as above). I have a callback function, in which I publish the node name whenever the level of operation is ERROR -

void diagnosticCallback(const diagnostic_msgs::DiagnosticArrayPtr &diags_msg)
{
  int Maincode;
  if (diags_msg->status[0].level == diagnostic_msgs::DiagnosticStatus::ERROR)
  {
    Maincode = TextCode[diags_msg->status[0].name];
    ROS_INFO_STREAM("Error occured : " << Maincode);
  }
  else if (diags_msg->status[0].level == diagnostic_msgs::DiagnosticStatus::OK)
  {
    Maincode = TextCode[diags_msg->status[0].name];
    ROS_INFO_STREAM("No error");
  }
}

I want to check the node names every time we receive ERROR and then check all the elements of my map TextCode, if the name is present. If not then add the name as the next element in the map. How should I proceed with that?

Note - Diagnostics_msgs - http://docs.ros.org/api/diagnostic_msgs/html/msg/DiagnosticStatus.html)

Insert elements to a map listing the nodes I am subscribing to /diagnostics topic, to which all my nodes are publishing

Insert elements to a map listing the nodes I am subscribing to /diagnostics topic, to which all my nodes are publishing

Insert elements to a map listing the nodes I am subscribing to /diagnostics topic, to which all my nodes are publishing

Insert elements to a map listing the nodes I am subscribing to /diagnostics topic, to which all my nodes are publishing

Insert elements to a map listing the nodes I am subscribing to [/diagnostics](http://docs.ros.org/api/diagnostic_msgs/ht

Publishing multiple errors at a particular time I have a csv file listing all the errors the occur with the system. I am

Publishing multiple errors at a particular time I have a csv file listing all the errors the occur with the system. I am

Publishing multiple errors at a particular time I have a csv file listing all the errors the occur with the system. I am

Thank you @gvdhoorn for specifying each errors. I understand, I should have posted it in a more specific way. I was able

catkin_make errors while subscribing to diagnostic topic I am trying to subscribe to diagnostic topic and based on the l

catkin_make errors while subscribing to diagnostic topic I am trying to subscribe to diagnostic topic and based on the l

catkin_make errors while subscribing to diagnostic topic I am trying to subscribe to diagnostic topic and based on the l

catkin_make errors while subscribing to diagnostic topic I am trying to subscribe to diagnostic topic and based on the l

cmake execute_process command I have created a /csv and /scripts directories in my /src directory. The /csv directory co

I have created a /csv and /scripts directories in my /src directory. The /csv directory contains a csv file and /scripts directory contains a Python script to parse the csv file. The first few lines of the script is as follows -

import csv
with open('/home//default_ws/src/<package_name>/csv/alarms.csv', 'rb') as csvfile:
    reader = csv.reader(csvfile)
    for row in reader:

How can I add a generic location path for the csv file in my Python script? And what modifications do I need to make in my CMakelists.txt in order to install the /csv and /scripts directories?

* CORRECT ANSWER *

import csv
import os, rospkg
rospack = rospkg.RosPack()
with open(os.path.join(rospack.get_path("package_name"), "csv", "alarms.csv"), 'rb') as csvfile:
    reader = csv.reader(csvfile)
    for row in reader:

It works! Thank you @gvdhoorn

Generic path to read a file in a ROS directory I have created a /csv and /scripts directories in my /src directory. The