[Chicken-users] more 'foreign' questions

[Christoph Lange]

After I now managed quite a lot of my interfacing to the mqtt library, I'm stuck with the following:

I have the following definition of  a message struct, which I in fact get back a pointer to, from a callback:

(bind* "struct mosquitto_message{

          int mid;

          char *topic;

          void *payload;

          int payloadlen;

          int qos;

          ___bool retain;

        };")

When I print what I get in Scheme it says something along the line of #<pointer 0x562b13f1ee58>. Though the library frees the memory, it will -- according to manual -- only do so after the callback returns. So within the callback, I should be able to access / print it's content. Just how?! How do I access the different fields in that struct? Especially the payload?

/Christoph