C++
int acedRetNil();
File
acedads.h
Description
Returns a nil value to AutoLISP. The AutoLISP expression that invoked the external function returns the nil result as built-in and user-defined AutoLISP functions do.
The value returned by acedRetNil() is a special value that can be used to indicate a nil (empty) list, an error condition, or the successful completion of an external function that was not expected to return a value.
An external function can make more than one call to value-return functions upon a single kInvkSubrMsg message, but the AutoLISP function returns only the value passed it by the last value-return function invoked.
The acedRetNil() function always returns RTNORM.