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software Visual Basic 6
Introducing Visual Basic 6.0
Microsoft Visual Basic, the fastest and easiest way to create applications for Microsoft Windows. Whether you are an experienced professional or brand new to Windows programming, Visual Basic provides you with a complete set of tools to simplify rapid application development.
The "Visual" part refers to the method used to create the graphical user interface (GUI). Rather than writing numerous lines of code to describe the appearance and location of interface elements, you simply add prebuilt objects into place on screen. If you've ever used a drawing program such as Paint, you already have most of the skills necessary to create an effective user interface.
The BASIC (Beginners All-Purpose Symbolic Instruction Code) language, a language used by more programmers than any other language in the history of computing.
Visual Basic has evolved from the original BASIC language and now contains several hundred statements, functions, and keywords, many of which relate directly to the Windows GUI. Beginners can create useful applications by learning just a few of the keywords, yet the power of the language allows professionals to accomplish anything that can be accomplished using any other Windows programming language.
There are three main steps to creating an application in Visual Basic:
1. Create the interface.
2. Set properties.
3. Write code.
A Brief History of Visual Basic
Before Visual Basic 1.0 was introduced to the world in 1991, developers had to be well versed in C++ programming, as well as the rudimentary building blocks (Windows API) of the Windows system itself. This complexity meant that only the dedicated and properly trained were capable of turning out software that could run on Windows. Visual Basic changed all of that, and it has been estimated that there are now as many lines of production code written in Visual Basic as in any other language.
Visual Basic changed the face of Windows programming by removing the complex burden of writing code for the user interface (UI). By allowing programmers to draw their own UI, it freed them to concentrate on the business problems they were trying to solve. Once the UI is drawn, the programmer can then add code to react to events.
Visual Basic has also been extensible from the very beginning. Third-party vendors quickly saw the market for reusable modules to aid developers. These modules, or controls, were original referred to as VBXs (named after their file extension). If you didn't like the way a button behaved you could either buy or create your own. However, these controls had to be written in C or C++. Database access utilities were some of the first controls available.
When Microsoft introduced Visual Basic 3.0, the programming world changed again. Now you could build database applications directly accessible to users (so called front-end applications) completely with Visual Basic. There was no need to rely on third-party controls. Microsoft accomplished this task with the introduction of the Data Access Objects (DAO), which allowed programmers to manipulate data with the same ease as manipulating the user interface.