_index.js items different from cmake add_message_files items

[chengchenglee]

Hello, I try to use customized message type to transfer messages,
I happened to meet some error when using rosnodejs.require to call some packages.

I trace the reason and find out there is a strange thing as shown below.

first I add msg files to CMakeLists,txt

add_message_files(FILES
gpsState.msg
TrackedObject.msg
TrackedObjectSet.msg
)

then I catkin_make my project and check the file in devel folder.

workspace/devel/share/gennodejs/my_project_name/msg/_index.js

"use strict";

let TrackedObject = require('./TrackedObject.js');
let TrackedObjectSet = require('./TrackedObjectSet.js');
let gpsState = require('./gpsState.js');
let DynamicPoseWithCovar = require('./DynamicPoseWithCovar.js');

module.exports = {
TrackedObject: TrackedObject,
TrackedObjectSet: TrackedObjectSet,
gpsState: gpsState,
DynamicPoseWithCovar: DynamicPoseWithCovar,
};

the words in italic is not defined in my CMakeLists file.
and it leads to the failure when I want to use other type messages.

Could anyone could help?

Thanks in advance!

[Christian Fritz]

don't you just need to add DynamicPoseWithCovar.msg to your CMakeLists.txt?

[chengchenglee]

Hello @chfritz

I think I know the reason now.

yes, you are right.
if I just add DynamicPoseWithCovar.msg to my CMakeLists.txt, everything is fine.

but here there is a very tricky thing I found.
in the dir workspace/devel/share/gennodejs/my_project_name/msg/

_index.js will list all messages files which exist in src/ msg folder,
however, other *.js files are generated based on your description in CMakeLists.txt add_message_files.

add_message_files has to be identical with really files in msg folder.

it means even though you put some message files in msg folder, not quoted in CMakeLists.txt,
then when you want to require that package, error will pop up.

I know how to solve this problem.
well, I will not say it is a bug, but it is a little tricky,

Thanks a million!