ROS2 How to get an array from get_parameter? [closed]

edit

Thank you for your answer. I adapted my code, and I feel that I am halfway there.

I declared and set an initial value:

this->declare_parameter("ros_vec");
this->set_parameters({rclcpp::Parameter("ros_vec", std::vector<uint8_t>({1}))});

I also got info from this parameter like the demo:

  std::stringstream ss;
  for ( auto & parameter : this->get_parameters({"ros_vec"})){
      ss << "\nParameter name: " << parameter.get_name();
      ss << "\nParameter value (" << parameter.get_type_name() << "): " <<
      parameter.value_to_string();
    }
    RCLCPP_INFO(this->get_logger(), ss.str().c_str());

But, when I try to get the values from the YAML file as I do for the other parameters:

std::vector<uint8_t> test;
this->get_parameter("ros_vec", test);

It gets them only from the init above. If I don't initialize, it does not get any value, even though the name in the YAML and in the cpp file is the same.

What am I missing here?

Can you share your .yaml file ?

Sure, here it goes:

my_node:
    ros__parameters:
        ros_vec: [1,2]

I was able to make things work for doubles if I initialize ros_vec: [1.0, 2.0]. I could use it and then cast it to int. But it seems very odd that it does not work for integers...

You can do something like this:

std::vector<long> fizz;
rclcpp::Parameter param;
this->get_parameter("ros_vec", param);
fizz = param.as_integer_array();
for(int v: fizz) {
  std::cout << "v: " << v << std::endl;
}

At

fizz = param.as_integer_array();

I get:

terminate called after throwing an instance of 'rclcpp::ParameterTypeException'
  what():  expected [integer_array] got [not set]

rclcpp::Parameter

std::vector<int> ros_vec; 
ros_vec = this->get_parameter("ros_vec").as_integer_array();