subscriber's callback in C++

asked 2022-09-29 14:41:52 -0500

11 ●7 ●15 ●21

I want to extract data from a topic in which ticks from encoders are published but i dont know the syntax for this process

So for example i have written this callback :

void left_ecn_cb(const std_msgs::UInt16::ConstPtr& lTick_msg)
{
  // here i need to store the values coming from topic 
 // into the variable lTick  
}

which is the proper syntax to do that ?

Also is there any book or pdf or web page which using a lot of examples to learn c++ and ros

answered 2022-09-29 21:39:25 -0500

JustinBlack02
131 ●2 ●14 ●11

which is the proper syntax to do that ?

void left_ecn_cb(const std_msgs::msg::UInt16::ConstPtr& ltick_msg) {
  auto ltick = ltick_msg->data;
}

Also is there any book or pdf or web page which using a lot of examples to learn c++ and ros

A good place to start with tons of examples is the official documentation page. However, if you are interested in more structured learning then maybe look at TheConstruct. There are some books out there but I don't know if they are any good.

edit flag offensive delete link

Comments

The callback prototype also seems to suggest ROS 1. The example code you show appears to be ROS 2.

The OP labelled his question with noetic, which would be ROS 1.

The book link also appears to link to a ROS 2 book.

gvdhoorn ( 2022-09-30 00:52:55 -0500 )edit

Could you explain to me what auto does . I used this syntax without auto and it worked perfectly . Is auto important ? Do i have to add it too ? Also i am doing this in ROS1

Kostas Tzias ( 2022-10-03 04:07:20 -0500 )edit

add a comment

subscriber's callback in C++

1 Answer

Comments

Question Tools

Stats

Related questions

subscriber's callback in C++ edit

1 Answer

Comments

Question Tools

Stats

Related questions

subscriber's callback in C++