Object-oriented Programming

OBJECT-ORIENTED PROGRAMMING Windows operating system is GUI-capable. Graphical User Interface(GUI) allows the user to interact with the computer system.

OBJECT-ORIENTED PROGRAMMING – the emphasis of a program is on the objects included in the user interface such as scroll bars and buttons and the events such as scrolling and clicking that occur when those objects are used. OOP is easier to develop, debug and maintain.

OBJECT-ORIENTED PROGRAMMING VISUAL BASIC – is a Microsoft Windows programming language.  VB programs are created in an Integrated Development Environment(IDE).  Allows to create working programs in a fraction of the time that it would normally take to code programs without using IDE.  Used as Rapid Application Development(RAD).

IDE – allows the programmer to create, run, and debug VB.

OBJECT-ORIENTED PROGRAMMING

Features of VB:

• • • • • •

Graphical User Interface Event-handling Access to the Win32 API Object-oriented features Error-handling Structured programming

OBJECT-ORIENTED PROGRAMMING VB Versions: 2. LEARNING EDITION – provides fundamental programming capabilities. 3. PROFESSIONAL EDITION – provides a much richer set of programming capabilities. It is usually the choice of most programmers. 4. ENTERPRISE EDITION – used for developing large-scale computing systems that meet the needs of substantial organizations.

OBJECT-ORIENTED PROGRAMMING STANDARD EXE – allows the programmer to create a standard executable program.

ROJECT – group of related VB file

OBJECT-ORIENTED PROGRAMMING

STANDARD EXE project contains:

Project 1 – Form1(Form) Form Layout Properties – Form1 Project – Project1 Toolbox

VISUAL BASIC SCREEN MAIN WINDOW – at the top of the screen contains the title bar, menu bar and standard toolbar. TITLE BAR – indicates that VB is currently working in design time, which means it is waiting for you to design your application.  Shows also the name of the current application which is Project1.

VISUAL BASIC SCREEN MENU BAR – displays the commands the user will use to build the application. STANDARD TOOLBAR – provide quick access to the most commonly used menu commands.

VISUAL BASIC SCREEN FORM WINDOW – one of many objects you can create in VB, appears in the center of the screen.  You design the user interface for your application. TOOLBOX WINDOW – contains the set of tools you use when designing a VB application.  Allows you to place object(controls) on the form.

VISUAL BASIC SCREEN PROJECT EXPLORER/PROJECT WINDOW – displays a hierarchical list of the projects included in the application you are creating currently, as well as all of the items contained in each project.  Displays to see the names of the files included in the application. PROJECT WINDOW contains: VIEW CODE – displays a window for writing VB code. VIEW OBJECT – displays the form. TOGGLE FOLDERS – toggles the form folders.

VISUAL BASIC SCREEN

PROPERTIES WINDOW – each object has set of characteristics; control the object’s appearance and

VISUAL BASIC MENU DIRECTORY

1. FILE MENU – options for opening projects, closing projects, printing projects. 3. EDIT – options such as cut, paste, find, undo and delete. 5. VIEW – options for displaying IDE window and toolbars. 4. PROJECT – options for adding

VISUAL BASIC MENU DIRECTORY

• FORMAT – options for aligning and locking a form’s control. 6. DEBUG – options for debugging. 7. RUN – options for executing a program, stopping a program. 8. QUERY – options for manipulating data retrieved from a database.

VISUAL BASIC MENU DIRECTORY DIAGRAM – options for editing and

9. viewing the design of databases.

10. TOOLS – options for IDE tools and options for customizing the environment. 11. ADD-INS – contains for using installing and removing add-ins. 7.WINDOWS – options for arranging and displaying windows. 13. HELP – options for getting help.

VISUAL BASIC TOOLBOX 1. POINTER – used to interact with the controls on the form. It is not a control. 3. PICTURE BOX – displays images. 5. LABEL – displays uneditable text to the user. 4. TEXTBOX – accepting user

VISUAL BASIC TOOLBOX 5. FRAME – grouping other controls. 6. COMMAND BUTTON – represents a button. Clicks to initiate an action. 7. CHECKBOX – provides the user with a toggle choice. 8. OPTION BUTTON – also

VISUAL BASIC TOOLBOX 9. LISTBOX – provides a list of items. 10. COMBO BOX – provides a short list of items. 11. HSCROLLBAR – horizontal scroll bar. 12. VSCROLLBAR – vertical scroll bar.

VISUAL BASIC TOOLBOX 1. TIMER – performs a task at programmer-specified intervals. 3. DRIVELISTBOX – accessing the system disk drive. 5. DIRLISTBOX – accessing directories on a system. 16. FILELISTBOX – accessing

VISUAL BASIC TOOLBOX 1. SHAPE – drawing circles, rectangles, squares, etc. 3. LINE – drawing lines. 5. IMAGE – displaying images. 7. DATA – connecting to a database. 21. OLE – interacting with other window applications.