ObjectOriented Information Systems

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Object-Oriented Information Systems

• Spring 2003
• Ki Tai Jeong

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Basic Concept of Programming Language

• Low level programming language
• Machine language
• Assembly language
• High level programming language
• COBOL, FORTRAN, RPG
• Mid level programming language
• Basic, C
• Interpreter programming language
• Perl, Basic

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Basic Concept of Programming Language

• Compiler programming language
• COBOL, FORTRAN
• Procedural language
• COBOL, FORTRAN, PL/1
• Event-driven programming language
• Visual Basic, Visual Java, Visual C
• Object-Oriented programming language
• C, Java, Visual Basic, etc.

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Chapter 1. Introduction to Visual Basic

• Terms
• Graphical User Interface (GUIgooey) -toolbox
• Forms windows and dialog boxes (option, check)
• Controls - elements from toolbox (text box,
  command button, list box)
• Projects - forms and controls

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Terms

• Objects a thing or a noun
• Forms and controls
• Properties something about an object, adjectives
  that describe objects
• Name, color, size, location, etc.
• Methods actions associated with objects, verbs
  for noun
• Move, print, resize, etc.

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Writing Visual Basic ProjectsThe Three-Step
Process

• Planning
• 1. Design the user interface
• 2. Plan the properties
• 3. Plan the Basic code
• Programming
• 1. Define the user interface
• 2. Set the properties
• 3. Write the Basic code

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Visual Basic Projects

• .vbp (Project file)
• .mak (Visual Basic 2.0 or 3.0)
• .frm (Form file)
• .bas (Standard code modules)
• .ocx (Custom controls)
• .vbw (Projects forms)

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The Visual Basic Environment

• The Form Window
• The Project Explorer Window
• The Properties Window
• The Form Layout Window
• The Toolbox
• The Main Visual Basic Window
• The Toolbar
• The Form Location and Size Information
• Help
• Design Time, Run Time, and Break Time

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Hello World Project

• Design the user interface
• Plan the properties
• Plan the basic code

lblMessage
cmdPush
Push Me
Exit
cmdExit