VBScript Tutorials - Herong's Tutorial Examples

∟Creating Your Own Classes

This chapter provides tutorial examples and notes on classes and objects. Topics include defining a new class, instantiating a new object, assigning object reference, initializing and terminating an object, defining properties with 'Public' statements and 'Property' procedures, defining methods with 'Public' qualifiers, defining the default method.

Class, Property, Method and Related Statements

"Class" Statement - Defining Your Own Class

"New" Operator and "Nothing" Object

"Public/Private" Variables and Dot Operator

"Property Let/Set/Get" Procedures

Object Methods - "Public" Procedures

"New", "Set", "Is", ".", "Nothing" - Object Operations

"StringBuffer" - A Class Example

Conclusions:

• You can define a class in VBScript with the "Class" statement.
• The "New" operator creates a new object and returns a reference of the object.
• The "Set" statement assigns an object reference to a variable.
• The "Class_Initialize" procedure will be called when a new object is created.
• The "Nothing" object is useful, if you want to release the reference of an object in a variable.
• The "Class_Terminate" procedure will be called when the last reference of an object is released.
• "Public" statement defines simple public properties.
• "Private" statement defines private variables.
• "Property Let/Set/Get" procedures defines complex public properties.
• "Public" qualifier makes a procedure as a public method.
• "Private" qualifier keeps a procedure as a private procedure.
• "Public Default" qualifier makes a procedure as a default method.
• The default method can be called without the method name.

Table of Contents

 About This Book

 Introduction of VBScript - Visual Basic Scripting Edition

 Variant Data Type, Subtypes, and Literals

 Arithmetic Operations

 Numeric Comparison Operations and Logical Operations

 String Operations - Concatenation and Comparison

 Variable Declaration and Assignment Statement

 Expression and Order of Operation Precedence

 Statement Syntax and Statement Types

 Array Data Type and Related Statements

 Array References and Array Assignment Statements

 Conditional Statements - "If ... Then" and "Select Case"

 Loop Statements - "For", "While", and "Do"

 "Function" and "Sub" Procedures

 Built-in Functions

 Inspecting Variables Received in Procedures

 Error Handling Flag and the "Err" Object

 Regular Expression Pattern Match and Replacement

 scrrun.dll - Scripting Runtime DLL Library

►Creating Your Own Classes

 IE Web Browser Supporting VBScript

 IIS ASP Server Supporting VBScript

 WSH (Windows Script Host)

 References

 Printable Copy - PDF Version