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POErrors while building my ROS node
 

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  1. POErrors while building my ROS node
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    <p>I am new to ROS...and trying to create a simple random number generator, which will publish the randomly generated values. For this I created a Position class :</p> <pre><code>include "stdlib.h" namespace RandomPositionGenerator { class Position { private: double x; double y; double z; public: Position(); void setPosition(); void getPosition(double &amp;a, double &amp;b, double &amp;c); }; Position::Position(){} void Position::setPosition() { x = rand(); y = rand(); z = rand(); } void Position::getPosition(double &amp;a, double &amp;b, double &amp;c) { a=x; b=y; c=z; } } </code></pre> <p>and used this class to create my publisher :</p> <pre><code>include "ros/ros.h" include "std_msgs/String.h" include "sstream" include "Position.cpp" /** * This method generates position coordinates at random. **/ int main(int argc, char **argv) { ros::init(argc, argv, "talker"); ros::NodeHandle n; ros::Publisher position_pub = n.advertise&lt;RandomPositionGenerator:: Position&gt; ("position", 50); ros::Rate loop_rate(10); double pos_x=0; double pos_y=0; double pos_z=0; while (ros::ok()) { RandomPositionGenerator:: Position pos; pos.setPosition(); pos.getPosition(pos_x,pos_y,pos_z); ROS_INFO("The co-ordinates are : x=",pos_x); position_pub.publish(pos); ros::spinOnce(); loop_rate.sleep(); } return 0; } </code></pre> <p>And now I get the following errors:</p> <ol> <li>‘__s_getDataType’ is not a member of ‘RandomPositionGenerator::Position’ </li> <li>‘__s_getMD5Sum’ is not a member of ‘RandomPositionGenerator::Position’ </li> <li>‘const class RandomPositionGenerator::Position’ has no member named ‘__getDataType’ </li> </ol> <p>and some more similar errors...Please correct me...I am not sure where am I going wrong, or if there is anything that I did right in this small bit of code !</p>
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    1. USJim Lewis
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    1. COSeems like some kind of build problem...there's not enough information here to see what went wrong. (You didn't show the lines of code that generated those error messages...that might help.) But `#include "Position.cpp"` looks like an issue -- it is highly unusual to `#include` source code (.cpp as opposed to .h) files; you're supposed to compile them separately and combine them using the linker. I am unfamiliar with the ROS API, but I wonder if you've tried to redefine an internal `Position` class that implements the missing methods, or if you're supposed to inherit them from somewhere?
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      1. USJim Lewis
    2. COI think ROS msgs don't allow my custom class Position to be a valid msg_type bcz it is missing these members....but I don't know where to find them or how to implement them in my class Position
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