PtrZone
PtrZone Find which heap zone owns a nonrelocatable block Ptr thePtr ; address of a nonrelocatable memory block returns address of a 62-byte Zone structure Given the address of a nonrelocatable memory block, PtrZone tells you in which heap zone that block resides.
thePtr is the address of a nonrelocatable memory block; i.e., the value
obtained from a prior call to NewPtr. Returns: the address of a Zone structure. It identifies the heap zone that contains the relocatable block addressed by thePtr. Use MemError to see if this return value is meaningful; it will return an
noErr (0) No error
memWZErr (-111) Illegal operation on a free block