How are service.h files are generated from service.srv files ?

asked 2018-05-03 04:57:00 -0600

aks
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Using Sevices in ROS, we create a service definition file in the srv folder and name it as service.srv and when we include this as service.h in the cpp file. How is the .h file generated from .srv ? In my case, while compiling using catkin_make it says no service.h file found in the .cpp file whereas it is present. Any leads ?

answered 2018-05-03 05:12:12 -0600

gvdhoorn
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In my case, while compiling using catkin_make it says no service.h file found in the .cpp file whereas it is present. Any leads ?

you're running into a dependency declaration problem. We can explain to you how headers are generated from the IDL, but for this particular problem, see C++ message or service dependencies in the Catkin documentation.

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I took this example from github and i guess it already has all the dependencies. @gvdhoorn

aks ( 2018-05-03 16:15:34 -0600 )edit

@gvdhoorn : yes, you were correct : fixed it by adding dependencies.

aks ( 2018-05-03 16:24:52 -0600 )edit

I took this example from github and i guess it already has all the dependencies. @gvdhoorn

well, I just checked it, and it doesn't (as you probably also found out).

gvdhoorn ( 2018-05-04 03:19:48 -0600 )edit

yes : dependencies added !

aks ( 2018-05-04 03:20:49 -0600 )edit

@gvdhoorn again coming back to my previous question, how are headers generated from IDL ? For example, if i need to create a new service file, then how can I add the header file in the cpp. Normally it says no such file found.

aks ( 2018-05-15 10:59:19 -0600 )edit

Normally it says no such file found.

it should only give that error if you've not followed procedure.

provided the msg / srv file exists, you've added the dependencies to your target and followed the docs on generating msgs / srvs things should work.

gvdhoorn ( 2018-05-15 11:01:24 -0600 )edit

It's all documented in the Catkin documentation I linked earlier and on the ROS wiki.

gvdhoorn ( 2018-05-15 11:01:49 -0600 )edit

I created an overlay space and copied the demo_nodes_cpp example in ROS2 into the overlay ws and renamed it(heatflow_cpp). Created a new service file(heatFlow.srv) and changed the name of the service file in the CMAKELISTS and then included heatFlow.hpp in the cpp.Am i forgetting something ?

aks ( 2018-05-15 11:06:46 -0600 )edit

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