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Inside Macintosh: Interapplication Communication /


Chapter 3 - Introduction to Apple Events

This chapter introduces Apple events and the Apple Event Manager. Later chapters describe how your application can use the Apple Event Manager to respond to and send Apple events, locate Apple event objects, and record Apple events.

The interapplication communication (IAC) architecture for Macintosh computers consists of five parts: the Edition Manager, the Open Scripting Architecture (OSA), the Apple Event Manager, the Event Manager, and the Program-to-Program Communications (PPC) Toolbox. The chapter "Introduction to Interapplication Communication" in this book provides an overview of the relationships among these parts.

The Apple Event Registry: Standard Suites defines both the actions performed by the standard Apple events, or "verbs," and the standard Apple event object classes, which can be used to create "noun phrases" describing objects on which Apple events act. If your application uses the Apple Event Manager to respond to some of these standard Apple events, you can make it scriptable--that is, capable of responding to scripts written in a scripting language such as AppleScript. In addition, your application can use the Apple Event Manager to create and send Apple events and to allow user actions in your application to be recorded as Apple events.

Before you use this chapter or any of the other chapters about the Apple Event Manager, you should be familiar with the chapters "Event Manager" in Inside Macintosh: Macintosh Toolbox Essentials and "Process Manager" in Inside Macintosh: Processes.

This chapter begins by describing Apple events and some of the data structures they contain. The rest of the chapter introduces the use of the Apple Event Manager to

Finally, this chapter summarizes the tasks you can perform with the Apple Event Manager and explains where to locate information you need to perform those tasks.


Chapter Contents
About Apple Events
Apple Events and Apple Event Objects
Apple Event Attributes and Parameters
Apple Event Attributes
Apple Event Parameters
Interpreting Apple Event Attributes and Parameters
Data Structures Within Apple Events
Descriptor Records
Keyword-Specified Descriptor Records
Descriptor Lists
Responding to Apple Events
Accepting and Processing Apple Events
About Apple Event Handlers
Extracting and Checking Data
Interacting With the User
Performing the Requested Action and Returning a Result
Creating and Sending Apple Events
Creating an Apple Event Record
Adding Apple Event Attributes and Parameters
Sending an Apple Event and Handling the Reply
Working With Object Specifier Records
Data Structures Within an Object Specifier Record
The Classification of Apple Event Objects
Object Classes
Properties and Elements
Finding Apple Event Objects
About the Apple Event Manager
Supporting Apple Events as a Server Application
Supporting Apple Events as a Client Application
Supporting Apple Event Objects
Supporting Apple Event Recording

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