VBScript Fundamentals and Features

Overview on VBScript

 


Microsoft Visual Basic Scripting Edition (VBScript) brings active scripting to a wide variety of environments, including Web client scripting in Microsoft Internet Explorer and Web server scripting in Microsoft Internet Information Service (IIS).

VBScript is also used for Network Administration, System Administration and for UFT Test Automation.

If we already know Visual Basic (VB) or Visual Basic for Applications (VBA), VBScript will be very familiar.
The basic concepts of VBScript are common to most programming languages.

VBScript talks to host applications using Windows Script. With Windows Script, browsers and other host applications do not require special integration code for each scripting component.

VBScript Fundamentals and Features

1) Comments (Optional)

To make the code Readable
To make disable from execution

2) Data Types

    Check Data Sub Types
Covert Data from one type to another

3) Declarations

    Constants (Built-in, User defined)
Variables (Scalar, Array)

4) VBScript Operators

    Arithmetic
Comparison
Logical
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Concatenation

5) Flow Control statements

    a) Conditional Statements
If Statement
Select Case Statement

b) Loop Statements
For…Next
While…Wend
Do While / Until …Loop
For Each…Next

6) Functions

a) Built-in Functions

i) Array Functions
ii) String Functions
iii) Date & Time Functions
iv) Conversion Functions
v) I/O Functions
vi) Math Functions etc…

 b) User defined Functions
 
Sub procedures (Public (Internal, External), Private)
Function procedures (Public (Internal, External), Private)

7) Coding conventions

8) Regular Expressions

9) File System Operations

What is Computer File System?

Examples for File System Operations

How end user performs File System Operations

How to do automatic File System Operations

Create File System Object

Set Variable = CreateObject(“Scripting.FileSystemObject”)

10) Excel Application Object

It is used to perform operations on Excel Application

Excel Application

Excel File / Excel Work Book

Excel Sheet / Excel Work sheet

Create Excel Application Object

Set Variable = CreateObject(“Excel.Application”)

11) Word Application Object

It is used to perform operations on Word Application /documents

Create Word Application Object

Set Variable = CreateObject(“Word.Application”)

12) Database Object Models

a) Database Connection Object
It used to connect to Databases

Set Variable = CreateObject(“Adodb.Connection”)

b) Dtatbase Recordset Object
It is used to perform operations on Database Tables

Set Variable = CreateObject(“Adodb.Recordset”)

13) Dictionary Object

It is used to define Key, value pairs

Set Varible = CreateObject(“Scripting.Dictionary”)

14) Error Handling

Handling expected and unexpected Errors

Using Exist property and Conditional statements
Using Exit Statement
Using Option Explicit statement
Using some built functions
Using On Error Resume Next
etc…
15) VBScript Statements
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