Using DSM API

I am studying the DSM APIs and I am trying to understand how to use the API, QsnWrtSFMaj, to create checkbox, pushbuttons and etc ...

Based on this example, I tried to understand how the API works, but it was not clear how it works, because apparently in RPG less parameters are sent to the function, already in C, there are N parameters that are not clear what they are


This is function prototype:

    Q_Bin4 QsnWrtSFMaj(const char *,
                       Q_Bin4,
                       Q_Bin4,
                       Q_Bin4,
                       Q_Bin4,
                       Qsn_Cmd_Buf_T,
                       Qsn_Env_T,
                       Q_Fdbk_T *);

This is the function prototype, defined on QSNAPI.H
In the manual informs to check the tables in document SC30-3533, I found the table that contains the necessary information for the structure, but I still don't know exactly how to use this information ...
( manual: http://www.aibobar.de/file/SC30-3533-04.pdf , go to page 140 section "15.6.13.5 DEFINE SELECTION FIELD Structured Field")