Legacy Document

Inside Macintosh: Networking With Open Transport / Part 2 - Open Transport Reference

Chapter 24 - Mappers Reference / Constants and Data Types

Error-Checking Constant

Open Transport provides a constant that you can use to initialize the private mapper reference structure. You can then check that the current mapper reference is valid before passing it to mapper functions. The constant is defined as follows:

#define  kOTInvalidMapperRef ((MapperRef)0)