get the message definition in c++

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Hi everyone,

i would like to get the ros message defintion file as a string in c++. Similar to how it is done in python ...

Where I just have to call:

rosmsg.get_msg_text("sensor_msgs/Joy")

and get the following output:

std_msgs/Header header
  uint32 seq
  time stamp
  string frame_id
float32[] axes
int32[] buttons

The message type is not known before compile time ... Thus, everything I have is a string in the following format

std::string strType = "sensor_msgs/Joy"; // or something else like = "std_msgs/String" ...

so i need a method or a function which takes in a string, defining the package and the message type ... and want to get out a string with the complete message definition ...

But like it is done in python, not only the content of sensor_msgs/msg/Joy.msg, which is:

Header header           # timestamp in the header is the time the data is received
float32[] axes          # the axes measurements from a joystick
int32[] buttons         # the buttons measurements from a joystick

I need the extracted format of all nested message definitions like presented in the first example ...

I think this is also possible somehow in roscpp, but I could not figure it out yet, thanks for any suggestions ...

Cheers ...