Legacy Document

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

Chapter 21 - Providers Reference / Constants and Data Types

Error-Checking Constant

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

#definekOTInvalidProviderRef((ProviderRef)(0)