Passing msg data from Python to C++

edit

Hey,

I have a topic written in Python, inside that workspace I have two message files:

Msg1

Header header
geometry_msgs/Vector3 direction
geometry_msgs/Vector3 normal
geometry_msgs/Point palmpos
geometry_msgs/Vector3 ypr

Msg2

Header header

float64[3] hand_direction
float64[3] hand_normal
float64[3] hand_palm_pos
float64 hand_pitch
float64 hand_roll
float64 hand_yaw

If I therefore do: std_msgs/Header header I get the information. The problem being is that now I'm using C++ to write another topic to subscribe to this. I don't know what to put inside of the callback function, for example:

void callback(const [here]& msg)
{

}

Since when I'm using the Point2Cloud I can use the following:

void callback(const sensor_msgs::PointCloud2Ptr& msg)
{
    // Blah
}

COuld anyone please tell me what I should therefore use?