How to know the correct publisher type

asked 2013-05-13 09:31:15 -0600

Iván
3 ●3 ●3 ●6

updated 2014-04-20 14:09:21 -0600

ngrennan
1 ●1 ●1

Hi,

I'm trying to make a program works with roscopter (https://code.google.com/p/roscopter/). In python I don't have any problem, but when I try to translate that to cpp, I don't know how to use the publisher and the subscriber.

In python, the publisher is just:

pub_rc = rospy.Publisher('send_rc', roscopter.msg.RC)

where "roscopter.msg.RC" is the type, and 'send_rc' is the variable that I want to publish.

In cpp, I think that I have to do something like this:

ros::NodeHandle nh; ros::Publisher publisher = nh.advertise< ::roscopter::RC>("send_rc", 1);

But that doesn't work, and I think than it is because < ::roscopter::RC> is not the correct type. Does someone know some way to know the right type?

Thank you!

---- EDIT ----

With the solution of jarvisschultz it compiles. But I think there is still a problem with the type. "msg" should be an array int32[8], but I cannot fill that array.

I try just with: roscopter::RC msg; msg[2] = 1000;

And the error is: no match for ‘operator[]’ in ‘msg[2]’

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The first set of double colon's inside of the typedef seem weird to me... try <roscopter::RC> . Also be sure to #include "roscopter/RC.h"

jarvisschultz ( 2013-05-13 10:38:03 -0600 )edit

I already have that include. And I used < ::roscopter::RC> just because I thought it should be some similar to that and in the RC.h file I read this line: typedef boost::shared_ptr< ::roscopter::RC_<ContainerAllocator> > Ptr; and a lot of similar lines.

Iván ( 2013-05-13 11:33:07 -0600 )edit

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#include <ros/ros.h> #include "roscopter/RC.h" int main(int argc, char **argv) { ros::init(argc, argv, "rc_sender"); ros::NodeHandle n; ros::Publisher rc_pub = n.advertise<roscopter::RC>("send_rc", 1000); ros::Rate loop_rate(10); int count = 0; while (ros::ok()) { roscopter::RC msg; rc_pub.publish(msg); ros::spinOnce(); loop_rate.sleep(); ++count; } return 0; }

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Thank you, now it compiles. But now I have the problem that I show at the end of my question.

Iván ( 2013-05-15 01:08:30 -0600 )edit

Your line of code should probably be something like msg.channel[2] = 1000;

jarvisschultz ( 2013-05-15 04:00:27 -0600 )edit

Thank you!!! It works!!

Iván ( 2013-05-15 08:44:16 -0600 )edit

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