| ROS Resources: Documentation | Support | Discussion Forum | Index | Service Status | Q&A answers.ros.org |
I have a question about the code:
if (client.call(srv))
{
ROS_INFO("Sum: %ld", (long int)srv.response.sum);
}
else
{
ROS_ERROR("Failed to call service add_two_ints");
return 1;
}
Why is there a return value of 1? Is a return value just always required when calling a service?
The return value of client.call(srv)?
Then the return value is always 1 (true - boolean) when the service succeeded in calling it. If for example the node for the service would have been stopped for any reason, the service would fail to call, because it does not exist, then you should get a 0 (false).
The return value of the else statement?
The return value of the else statement would be for your node or a function, anything else than 1 would indicate another process/calling function checking your programs/functions return and see if it is not 0 that something went wrong with it.
0 normally indicates, all right, sometimes it is the other way round ...
Asked: 2015-07-31 14:42:07 -0500
Seen: 790 times
Last updated: Aug 01 '15
ROS Answers is licensed under Creative Commons Attribution 3.0 Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
You removed the function around your snippet, so we can only guess what the return value means. Is it the return value of your program?