Roscpp error - rosc++ in 5 days course

Yelaina · August 20, 2021, 9:50pm

Hello,

I hope you are good. I am getting the error in the picture below for rosc++ in 5 days course. It doesnt recognize ros for some reason so i am unable to launch the simple.cpp script. Please help me solve this problem, thank you.

roalgoal · August 23, 2021, 7:56am

Hi Elena,

Try with

#include "ros/ros.h"

Also make sure that you added the script as an executable to CMakeLists.txt

bayodesegun · August 23, 2021, 10:30am

Are you getting any errors when you try to launch the script? You may ignore those errors in the IDE if they are not related to the errors you get (if any) while running the script.

The IDE ‘header file not found’ error is a known issue and we are looking into it.

Yelaina · August 24, 2021, 11:02pm

okay i would try this, thank you.

Yelaina · August 24, 2021, 11:03pm

Yes @bayodesegun i get errors when i launch the script.

bayodesegun · August 25, 2021, 12:42am

The errors are not necessarily related. What errors are you getting?

ralves · August 26, 2021, 6:47pm

Hi @Yelaina ,

we’ve just solved the autocompletion for C++ issue.

Now it should work properly.

It may happen that the IDE may not autocomplete just instantly because it may be parsing the include files, but after some seconds it should work fine.

Thanks for reporting it.

Yelaina · August 31, 2021, 7:03pm

Thank you @ralves. I have tried launching the program again and got the below error.

user:~$ roslaunch my_package my_package_launch_file.launch
… logging to /home/user/.ros/log/143d52ea-0a8d-11ec-9333-0242ac170007/roslaunch-1_xterm-1599.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://1_xterm:37187/

SUMMARY

PARAMETERS

/rosdistro: noetic
/rosversion: 1.15.9

NODES
/
ObiWan (my_package/simple.cpp)

ROS_MASTER_URI=http://1_simulation:11311

RLException: Unable to launch [ObiWan-1].
If it is a script, you may be missing a ‘#!’ declaration at the top.
The traceback for the exception was written to the log file
[ObiWan-1] killing on exit

bayodesegun · September 1, 2021, 9:11am

The error simply means your node is still not set up properly. Please ensure you:

Make the modifications necessary in CMakeLists.txt and package.xml. Please double-check for correct spelling and case (names are case-sensitive).
Compile the package.

cd ~/catkin_ws
catkin_make

Source

cd ~/catkin_ws
source devel/setup.bash

Yelaina · September 1, 2021, 9:13am

Okay I would check it again @bayodesegun , thank you.