About This Book

The InterSystems Callout Gateway (implemented in the InterSystems IRIS® $ZF functions) allows you to invoke external programs and system services from InterSystems IRIS. It also provides a way to integrate your custom code into InterSystems IRIS.

This book addresses the following topics:

• Introduction — introduces concepts important to understanding the rest of this book, summarizes the capabilities of the InterSystems Callout Gateway, and provides links to other resources.

• Running Programs or System Commands with $ZF(-100) — describes how to use a $ZF option that provides functionality similar to a command line interface.

• Creating an InterSystems Callout Library — describes how to create a Callout shared library with functions that can be invoked from InterSystems IRIS. Code can be written in any language that supports C/C++ calling conventions.

• Invoking Callout Library Functions — describes how to call functions dynamically from a Callout shared library.

• InterSystems Callout Quick Reference — provides a detailed description of each $ZF function.

For a detailed outline, see the Table of Contents.