Hello World: 4 The Source File and Source Code

The Hello World program's source code resides in a single file, hello3.goc . Portions of this file are presented throughout this section.

This sample application demonstrates the basics of all GEOS programs, and it's likely you will refer to it often until you become proficient with both the system and the reference documentation. Among the concepts and implementations it demonstrates are the following:

Declaration and use of resources
Standard inclusion files
Basic UI construction
Creation of the Primary window
Creation of a scrolling view and drawing to the view
Creation of a menu
Creation of a simple dialog box
Declaration of subclasses and messages
Definition of message handlers
Sending messages to another object

This discussion assumes you have a solid understanding of general programming concepts and C constructions. If you don't, you should most likely get to know the C programming language before continuing.

Inclusions and Global Variables

The Process Object

UI Objects

Code and Message Handlers

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