Lesson1 : Introduction to Visual Basic 6
1.1 The concept of computer programming
Programming means designing a set of instructions to instruct the computer to carry out certain jobs that are very much faster than human beings can do.
The earliest programming language uses combinations of 0 and 1 code to communicate with computer, a language that is called machine language. Machine language is extremely difficult to learn .
Fortunately , scientists have invented high level programming languges that are much easier to master.
Some of the high level programming languages are Java, C, C++, c# and Visual Basic.
1.2 What is Visual Basic?
VISUAL BASIC is a high level programming language that evolved from the earlier DOS version called BASIC. BASIC means Beginners'
All-purpose Symbolic Instruction Code. The code looks a lot like English Language. Now, there are many versions of Visual Basic are available in the market, the lastest being Visual Basic 2015 that is bundled with
other programming languages such as C#. However, the most popular one and still widely used by many VB programmers is none other than Visual Basic 6
VISUAL BASIC is also a VISUAL and Event-driven Programming Language. These are the main divergence from the old BASIC. In BASIC, programming is done in a text-only environment and the program is executed sequentially. In VB6, programming is done in a graphical environment. In the old BASIC, you have to write program code for each graphical object you wish to display it on screen, including its position and its color. However, In VB6 , you just need to drag and drop any graphical object anywhere on the form, and you can change its properties using the properties window.
In addition, Visual Basic 6 is Event-driven because we need to write code in order to perform some tasks in response to certain events. The events usually comprises but not limited to the user's inputs. Some of the events are load, click, double click, drag and drop, pressing the keys and more. We will learn more about events in later lessons. Therefore, a VB6 Program is made up of many subprograms, each has its own program code, and each can be executed independently and at the same time each can be linked together in one way or another.
1.3 What programs can you create with Visual
With VB 6, you can create any program depending on your objective.For math teachers, you can create mathematical programs such as Geometric Progression, Quadratic Equation Solver, Simultaneous Equation Solver ,Prime Number, Factors Finder, Quadratic Function Graph Plotter and so on. For science teachers, you can create simulation programs such as Projectile, Simple Harmonic Motion, Star War etc. If you are in business, you can also create business applications such as inventory management system , Amortization Calculator , investments calculator, point-of-sale system, payroll system, accounting program and more to help manage your business and increase productivity. For those of you who like games , you can create those programs such as slot machine, reversi, tic tac toe and more. Besides, you can create multimedia programs such as Smart Audio Player, Multimedia Player and more. Indeed, there is no limit to what program you can create ! We offer many sample codes in our tutorial.
1.4 The Visual Basic 6 Integrated Development Environment
Before you can program in VB 6, you need to
install Visual Basic 6 compiler in your computer. You can purchase a copy of Microsoft Visual Basic 6.0 Learning Edition
or Microsoft Visual Basic Professional 6.0 with Plus Pack
from Amazon.com, both are vb6 compilers. If you have already installed Microsoft Office in your PC or laptop, you can also use the built-in Visual Basic Application in Excel to start creating Visual Basic programs without having to spend extra cash to buy the VB6 compiler.
After installing vb6 compiler, the icon with appear on your desktop or in your programs menu. Click on the icon to launch the VB6 compiler. On start up, Visual Basic 6.0 will display the following dialog box as
shown in Figure 1.1.
Figure 1.1: New Project Dialog
You can choose to either start a new project, open an existing project or select a list
of recently opened programs. A project is a collection of files that make up
your application. There are various types of applications that we could create,
however, we shall concentrate on creating Standard EXE programs (EXE means
executable). Before you begin, you must think of an application that might be useful, have commercial values . educational or recreational. click on the Standard EXE icon to go into the actual
Visual Basic 6 programming environment.
When you start a new Visual Basic 6 Standard EXE project, you will be presented with the Visual Basic 6 Integrated Development Environment (IDE). The Visual Basic 6 Integrated Programming Environment is show in Figure 1.2. It consists of the toolbox, the form, the project explorer and the properties window.
Figure 1.2: VB6 Programming Environment
Form is the primary building block of a Visual Basic 6 application. A Visual Basic 6 application can actually comprises many forms; but we shall focus on developing an application with one form first. We will learn how to develop applications with multiple forms later. Before you proceed to build the application, it is a good practice to save the project first. You can save the project by selecting Save Project from the File menu, assign a name to your project and save it in a certain folder.
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