VBA Theory

7/26/2019 VBA Theory

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VBA Visual Basic for Applications

IDE Integrated Development Environment

File Extension Macro Enabled Workbook

i Procedural Programming

iiOOP - Object Oriented Programming

iiiOBP - Object Based Programming

SDLC Software Development Life Cycle

i Problem Denition

ii Feasibilit !tud and "e#uirements $at%erin

iii Design

iv&oding

v'esting

vi &ontroling

vii Maintenance

Data Type Denes t%e tpe ( si)e of t%e data being st

i Primary

a* +umeric

b* Date

c* !tring

ii Secondary

a* Variant , used -%en t%e data tpe stored

b* .b/ect , a pointer -%ic% stores t%e locatio

Operators A smbol0p%rase used to perform operations

i Aritmetic

ii!elational

iii

ivOter

"ogical


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CLASS

OBJECT

1*2lsm

Property

&3 etc Method

&443 5AVA3 etc Event

*+E'3 VBA3 etcModle

i

g ii

iii

!aria"le

Scope #ali$er red in t%e variable i

ii

Float3 Integer3 Bte etc* iii

6 btes iv

Fi2ed lengt%3 Variable lengt%

in t%e variable could var at runtime

n of %e ob/ect pointed in t%e "AM

of a specic nature on one or more operands

4 , 1 0 7 Mod

8 9: 9 : 98 :8

A+D ." +.' ;."

8 3 < = > (


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Data and t%e code -%ic% manipulates t%e data

&lass is implemented and I+!'A+&E of class is created

Denes t%e appearance and be%aviour of t%e ob/ect

Interface t%roug% -%ic% an ob/ect is issued a command to perform an action

.ccurance of certain action on t%e ob/ect

A set of variables and0or constants and0or procedures

All VBA coding is done in modules

!tandard Module =*bas>

Form Module =*frm>

&lass Module =*cls>

A named location in t%e computer


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Active .b/ects of E2cel VBA@ Application

!election Active&ell !ession

C Active!%eet

ActiveWindo- Workbook

Active&%art ActiveWorkbook Works%eet

G ActivePrinter "ange

&ell


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application

2


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Procedure Syntax

Variable Declaration 9scope #ualier: 9var* name: HAs 9data tpe: 9:

H


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!ules Exam#le

Compulsory component Dim x as Integer

Optional component Private abc as String

Dim abc as String*50

Public myVar_01 as Variant

Static stc as Static

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VBA Theory