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Is this the write way? i cant find the mistake.Can anyone please help me , especially at this example?

ros::NodeHandle node_handle_; ros::Subscriber xyz_subscriber_;

xyz_subscriber_ = node_handle_.subscribe("ModelStates", 10, ModelStatecallback);

void ModelStatecallback(const gazebo_msgs::ModelStates::ConstPtr& msg) { double actual_value_x=msg.pose[0].position.x double actual_value_y=msg.pose[0].position.y double actual_value_z=msg.pose[0].position.z }

int main(int argc, char **argv) { ros::init(argc, argv, "positioncontrol");

ros::spin();

return 0; }

Is this the write way? i cant find the mistake.Can anyone please help me , especially at this example?

ros::NodeHandle node_handle_; ros::Subscriber xyz_subscriber_;

xyz_subscriber_ = node_handle_.subscribe("ModelStates", 10, ModelStatecallback);

void ModelStatecallback(const gazebo_msgs::ModelStates::ConstPtr& msg) { double actual_value_x=msg.pose[0].position.x actual_value_x=msg.pose[0].position.x; double actual_value_y=msg.pose[0].position.y actual_value_y=msg.pose[0].position.y; double actual_value_z=msg.pose[0].position.z actual_value_z=msg.pose[0].position.z; }

int main(int argc, char **argv) { ros::init(argc, argv, "positioncontrol");

ros::spin();

return 0; }