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Inside Macintosh: Operating System Utilities /


Chapter 1 - Gestalt Manager

This chapter describes how you can use the Gestalt Manager and other system software facilities to investigate the operating environment. You need to know about the operating environment if your application takes advantage of hardware (such as a floating-point unit) or software (such as Color QuickDraw) that is not available on all Macintosh computers. You can also use the Gestalt Manager to inform the Operating System that your software is present and to find out about other software registered with the Gestalt Manager.

The Gestalt Manager is available in system software versions 6.0.4 and later. The MPW software development system and some other development environments supply code that allows you to use the Gestalt Manager on earlier system software versions; check the documentation provided with your development system.

In system software versions earlier than 6.0.4, you can retrieve a limited description of the operating environment with the SysEnvirons function, also described in this chapter.

You need to read this chapter if you take advantage of specific hardware or software features that may not be present on all versions of the Macintosh, or if you wish to inform other software that your software is present in the operating environment.

This chapter describes how the Gestalt Manager works and then explains how you can


Chapter Contents
About the Gestalt Manager
Using the Gestalt Manager
Determining Whether the Gestalt Manager Is Available
Getting Information About the Operating Environment
Interpreting Gestalt Responses
Adding a New Selector Code
Modifying a Selector Function
Getting Environmental Information Without the Gestalt Manager
Gestalt Manager Reference
Constants
Data Structures
The System Environment Record
Gestalt Manager Routines
Getting Information About the Operating Environment
Adding a Selector Code
Modifying a Selector Function
Application-Defined Routines
The Selector Function
Summary of the Gestalt Manager
Pascal Summary
Constants
Data Types
Gestalt Manager Routines
Application-Defined Routines
C Summary
Constants
Data Types
Gestalt Manager Routines
Application-Defined Routines
Assembly-Language Summary
Data Structures
Result Codes

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6 JUL 1996

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