Smarts C++ API question

Hi, I'm having trouble invoking a Server Tool using the Smarts C++ API.

I am using the operation "invokeSync" of an instance of class ICS_ActionManager sending the arguments:

   - "target" as a sm_objref_t

   - "action_id" as a sm_string_t

   - "parameters" as a sm_anyval_array_t

So far it works for tools without parameters (user prompts) where the "parameters" argument is sent empty, but I can not find any documentation on which values to send inside the "parameters" sm_anyval_array_t and in which order and of which type. For example if the Server Tool is expecting 2 parameters, the most intuitive option would be to send two sm_string_t values inside the "parameters" sm_anyval_array_t but it wont work returning the error "Remote server error".

Thanks.

Diego Carvallo.