libxrdeveloper's documentation
xr_value* xr_call_get_param ( xr_call call,
unsigned int  pos 
)

Get parameter from specified position (counts from 0).

Parameters
callCall obejct.
posParameter position (counts from 0).
Returns
Value node or NULL if parameter does not exist.
Warning
Returned value is still owned by the call object. Don't free it!
Documentation for libxr, Wed Apr 27 2016 22:07:49.