Sending messages

This function enables users to send a message from within a user primitive and retrieve the result.

U_32 EsSendMessage(EsVMContext vmContext, EsObject * returnObject, EsObject receiver, EsObject selector, U_32 argumentCount, ...)

Calls back into the VA Smalltalk interpreter by sending a message. returnObject is a pointer to an EsObject where the return value of the message is placed. argumentCount can be from 0 to 255.

Error cases: Returns an EsPrimErr code.

Side effects: This operation can cause a garbage collection.