VBScript Tutorial 1

VBScript Tutorial for UFT

I) Introducing VBScript:

> Visual Basic Scripting Edition, It is a light weight language from Microsoft.

> VBScript derived from VB Programming language.

> VBScript is not a case sensitive language.

> No formalities for writing statements.

> It ignores extra spaces.

It is a platform dependent language.

II) Scripting Languages versus Programming Languages

a) Scripting Languages:
Example: Shell script, Perl, Java Script, Python, Ruby, Rexx etc…

> No Explicit declaration of Data Types, Ex: Dim a, b, c

> Scripting Languages are Interpreter based languages.

> Scripting Languages support Explicit and Implicit declaration of Variables.

Example:

Dim a
a = 100 ‘Explicit variable
b = 200 ‘Implicit variable
Msgbox a + b

> Limited Support for Application development

> Limited support for UI design.

> Limited support for graphics design.

> Scripting Languages Can be easily integrated with other Technologies.

> Scripting Languages Reduce the code size
—————-
b) Programming Languages:

Example: COBOL, C, C++, Java, VB, VC++, C# etc….

> Programming Languages support Explicit Declaration of Data types only.

Example:

int a, char b, float c

> Programming Languages are Compiler based Languages.

> Programming Languages support Explicit declaration of Variables only.

> Rich support for Application development.

> Rich support for UI design.

> Rich support for Graphics design.

> Difficult to integrate with other technologies.
> Scripting Languages Increase the code size.

III) Usage of VBScript

a) Client side scripting in the Web (HTML) (Browser-IE)

b) Server side scripting in the web (ASP) (Web Server -IIS)

c) Network Administration on Server OS (WSH)

d) System Administration on Client OS or Server OS (WSH)
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e) Test Automation (UFT) (UFT)

VBScript Fundamentals and Features in UFT

IV) VBScript Fundamentals and Features

1) Adding Comments

Purpose:
To make the code Readable
To make the code disable from Execution

2) Data Types

> No Data type specification in VBScript

> VBScript considers data sub types based on usage of the Data

> using VarType function user can check the data sub types.

3) Declarations

a) Constants
Built in
User defined

b) Variables
Scalar Variables
Array variables
* Dictionary object is equilent to Hash variables/ Associated Arrays in Perl Script.

4) Operators

Categories of Operators

a) Arithmetic operators

b) Comparison operators

c) Logical operators
—————-
* Concatenation operators (Part of Arithmetic operators)

5) Conditional Statements

a) Types of conditional statements
i) If statement

ii) Select Case statement
————–
b) Types of conditions
i) Single condition

ii) Compound condition

iii) Nested condition
—————————–
c) Usage of Conditional statements
i) Execute a statement when condition is true / simple if

ii) Execute a block of statements when condition True.

iii) Execute a block of statements when condition True, otherwise execute another block
of statements.

iv) Decide among several alternates (Elseif)

v) Execute a block of statements when more than one condition is True (Nested If)

vi) Decide among several alternates (Using select Case)
——————
d) Purpose of Conditional statements in UFT

i) To insert verification points
ii) Error handling

6) Loop Statements

a) For…Next

b) While…Wend

c) Do While / Until…Loop

d) For Each…Next

* Using Exit Statement we can terminate the loops.

Note: we can insert Loop statements within conditions and vice versa

7) VBScript Functions

> Function is a Reusable code.

> Whenever we want execute same operations multiple times then we prefer functions.

Types of 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
vii) Miscellaneous functions

b) User defined Functions
————————–
i) Sub Procedures
Public, Private – Access control
Internal, External – Usage

ii) Function Procedures
Public, Private – Access control
Internal, External – Usage

8) Coding conventions

Writing comments

Naming conventions etc…

ex:

Dim num, city, Fso ‘Without standards

Dim intNum, strCity, objFso -With naming standards

9) File System Operations

> What is Computer File System?

> Examples for File System Operations

> How end user performs File System Operations

> How to perform automatic File System Operations

Using File System Object we can perform automatic File System Operations

Class value for creating File System Object – (“Scripting.FileSystemObject”)

Set Variable = CreateObject(“Scripting.FileSystemObject”)

Set is VBScript statement

CreateObject is Built function

10) Excel Application Operations

Excel Application Object:

It is used to perform operations on Excel Application/Excel files

Class Value for creating Excel Application object – (“Excel.Application”)

11) Word Application operations

Word Application Object

It is used to perform operations on Word Application / Word documents.

Class value for creating Word Application object – (“Word.Application”)

12) Database operations

a) Database Connection Object

It is used to connect to Databases

Note: Connection string only varies from One Database to another.

Class value for creating database connection object – (“Adodb.Connection”)
———-
b) Database Recordset Object

It is used to perform operations on Database Records.

Class value for creating Database Recordset object – (“Adodb.Recordset”)

13) Dictionary Object

It is used to define key, value pairs.

Class value – (“Scripting.Dictionary”)

14) Regular Expressions

Regular Expression – It is a formula for matching patterns

Constant matching –

india.doc – india.doc

Pattern matching

i*.

ia…..
ib……….
.
.
india.doc

15) Error Handling

Handling expected and unexpected Errors.

Expected Error:

Whenever we use invalid input then we can expect the Error.

Note: We use Invalid Input for Negative Testing
—————-
Unexpected Error:

Scenarios:

i) Availability of the Resource

ii) Resource Response

iii) Insufficient Resource.

VBScript features for Error Handling:

a) Conditional statements

b) Using some built in Functions

c) Using Exit Statement

d) Using Option explicit statement

e) Using On error Resume Next

Etc…
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