Introduction, Generations of computer, Visual Basic environment, Code window, Properties Window, IDE, Form Window, Starting an Application,Adding an Image Control, Running an Application

1. VISUAL PROGRAMMING
STAFF NAME : D.SARITHA
ASSISTANT PROFESSOR
DEPARTMENT OF COMPUTER APPLICATIONS
BON SECOURS COLLEGE FOR WOMEN
THANJAVUR
UNIT : I
CHAPTER : 1
TOPIC : INTRODUCTION TO VISUAL BASIC

2. INTRODUCTION TO
VISUAL BASIC

3. PERFORMING A TASK ON THE COMPUTER
 Determine Output
 Identify Input
 Determine process necessary to turn given
Input into desired Output

4. PICTORIAL REPRESENTATION OF THE PROBLEM
SOLVING PROCESS

5. WHAT IS VISUAL BASIC?
 High Level 4th Generation Programming
Language
 Object and Event Driven
 Visual - Windows Based
 Integrated Development Environment or IDE

6. WHAT IS VB USED FOR?
 Most Popular Programming Language
 Stand alone programs
 Applets that can be run on many different
kinds of computers
 Customized specialized Applications
 E- Commerce
 Web based shopping forms and inquiries
 User friendly Interface to applications

7. l l l l l l
Used by a computer equipment retail outlet to
record data regarding customer orders.
EXAMPLE ORDER ENTRY SCREEN
Allows user to use a mouse to click on boxes for text entry.
Also enables user to click on buttons
to initiate processing steps.

8. GENERATIONS OF COMPUTER LANGUAGES
 1st - Machine language - 0110 0011 1000
 2nd - Procedure-oriented languages
 FORTRAN - 1954 for scientists and engineers
 COBOL - 1959 for business applications
 C - 1972 - for UNIX operating systems
 3rd - Object-oriented languages
 4th - Event-driven languages - i.e.VB
 5th - Natural languages i.e. English

9. COMPILER VS INTERPRETER
 Higher Languages are translated to
Machine Language by:
Interpreter
 Translates instructions to machine code line-by-
line.
 BASIC, Quick Basic, Visual Basic
Compiler
 Translates the entire program to machine code
before running it.
 Fortran, C, C++, Visual Basic is also a compiler

10. WHAT ARE THE OBJECTS IN VB?
 Pre-programmed Code
for:
 Command Buttons
 Labels
 Pictures
 Text Boxes
 Have both data and
procedures wrapped
together

11. WHAT ARE THE EVENTS?
 Visual Basic “watches” what the user does
 A user activity is called an event
 Events include mouse clicks and moves, menu
selections, button presses, etc.
 Sections of code are only executed in response to
an event

12. WHAT IS THE INTEGRATED DEVELOPMENT
ENVIRONMENT (IDE)?

13. VISUAL BASIC ENVIRONMENT
GUI (Graphical User Interface) - forms and
windows that the user sees
Property - a characteristic or attribute of an object
such as color and size
Event - a user action such as clicking a button
Code Editor window - editor specially designed to
help you when writing code

14. VISUAL BASIC ENVIRONMENT
Components of the VB design environment
(Form view)

15. VISUAL BASIC ENVIRONMENT
Components of the VB design environment
(Code view)

16. THE CODE EDITOR WINDOW
Object List Box
Procedure List Box
Auto List Members
Full Module View
button

17. THE CODE EDITOR WINDOW
Help
window
Error message box
Syntax error in Red
Procedure view button

18. VB ENVIRONMENT: PROJECT WINDOW
The Project Window can be used to navigate
between the code and form window for each form
/ window a project has

19. VB ENVIRONMENT: MENU BAR
The Menu Bar consists of 3 elements the
 Title Bar, which holds the name of application, default
if Microsoft Visual Basic [design]
 Menu Bar, this is the link to Visual Basics menu
facilities, each menu option drops down into sub-
menus
 Toolbar, contains icons which give access to the more
commonly used commands (which are also available
through the menu bar)
Title bar Menu Bar Toolbar

20. VB ENVIRONMENT: PROPERTIES WINDOW
Used to set how a control
looks and
behaves
Holds its default values

21. VB ENVIRONMENT CONTROL TOOLBOX

22. VB ENVIRONMENT: CONTEXT SENSITIVE
HELP
 Context sensitive help is very useful
 Select the item control that you want help on
 Press the F1 key
F1

23. THE FILE MENU
Project commands
Make executable commands
Most recent project list
Exit command

24. THE FILE MENU
 New Project
 Open Project
 Add Project
 Remove Project
 Save Project
 Save Project As
 Save Component
 Save Component As
 Print
 Print Setup

25. THE FILE MENU
Template - particular pattern for a project or a project
element; start a project from a template saves
time
Existing tab - displays VB projects
Recent tab - displays most recently accessed
projects
Project Groups - a collection of several projects

26. BUILDING YOUR FIRST APPLICATION
 There are three primary steps in building a
Visual Project:
 Place (or draw) controls on the form.
 Assign properties to the controls.
 Write event procedures for the controls.

27. PROJECT FILES
vbp extension = Visual Basic Project
 file that tracks all components
frm extension = Form file
 separate file for each form
frx extension = Binary form file
 cannot be read by humans
vbw extension = Visual Basic workspace

28. VISUAL BASIC PROGRAM STRUCTURE
 Project File
◦ ‘.VBP’
 Form Files
◦ ‘.FRM’
◦ ‘.FRX’
 Modules
◦ ‘.BAS’
 Custom
Controls
◦ ‘.VBX’ files
 Save As...
◦ Possible
problem

29. STARTING VISUAL BASIC

30. CHOOSING PROJECT TYPE

31. PLACING CONTROLS ON THE FORM: IMAGE

32. ASSIGNING PROPERTIES TO CONTROLS

33. ADDING AN IMAGE

34. BROWSE FOR AN IMAGE

35. IMAGE DISPLAYED

36. BUTTONS AND TEXT BOXES

37. CHANGING THE FORM TITLE

38. WRITING THE CODE (EVENTS)

39. WRITING THE CODE (EVENTS)

40. RUNNING THE APPLICATION

41. RUNNING THE APPLICATION

42. THANK YOU