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Visual Basic
Visual Basic 6.0 logo.png
Visual Basic 6.0 on Windows XP.png
Visual Basic 6.0 IDE on Windows XP
ParadigmObject-based and event-driven
DeveloperMicrosoft
First appearedMay 1991; 31 years ago (1991-05)
Stable release
6.0 / 1998; 24 years ago (1998)
Typing disciplineStatic, strong
OSMicrosoft Windows and MS-DOS
Websitemsdn.microsoft.com/en-us/library/windows/desktop/ms788229.aspx
Major implementations
Microsoft Visual Studio
Influenced by
BASIC
Influenced
Visual Basic .NET, Windows Forms, Gambas, Xojo, Basic4ppc, Basic4android and NS Basic

The original Visual Basic (also referred to as Classic Visual Basic)[1] is a third-generation event-driven programming language from Microsoft known for its Component Object Model (COM) programming model first released in 1991 and declared legacy during 2008. Microsoft intended Visual Basic to be relatively easy to learn and use.[2][3] Visual Basic was derived from BASIC and enables the rapid application development (RAD) of graphical user interface (GUI) applications, access to databases using Data Access Objects, Remote Data Objects, or ActiveX Data Objects, and creation of ActiveX controls and objects.

A programmer can create an application using the components provided by the Visual Basic program itself. Over time the community of programmers developed third-party components.[4][5][6][7][8] Programs written in Visual Basic can also make use of the Windows API, which requires external functions declarations.

The final release was version 6 in 1998. On April 8, 2008, Microsoft stopped supporting Visual Basic 6.0 IDE. The Microsoft Visual Basic team still maintains compatibility for Visual Basic 6.0 applications through its "It Just Works" program on supported Windows operating systems.[9]

In 2014, some software developers still preferred Visual Basic 6.0 over its successor, Visual Basic .NET.[4] Visual Basic 6.0 was selected as the most dreaded programming language by respondents of Stack Overflow's annual developer survey in 2016, 2017, and 2018.[10][11][12]

A dialect of Visual Basic, Visual Basic for Applications (VBA), is used as a macro or scripting language within several Microsoft and ISV applications, including Microsoft Office.[13]

Language features

Like the BASIC programming language, Visual Basic was designed to have an easy learning curve. Programmers can create both simple and complex GUI applications. Programming in VB is a combination of visually arranging components or controls on a form, specifying attributes and actions for those components, and writing additional lines of code for more functionality. Since VB defines default attributes and actions for the components, a programmer can develop a simple program without writing much code. Programs built with earlier versions suffered performance problems, but faster computers and native code compilation has made this less of an issue.[citation needed] Though VB programs can be compiled into native code executables from version 5 on, they still require the presence of around 1 MB of runtime libraries. Core runtime libraries are included by default in Windows 2000 and later, but extended runtime components still have to be installed. Earlier versions of Windows (95/98/NT), require that the runtime libraries be distributed with the executable.

An empty form in Visual Basic 6
An empty form in Visual Basic 6

Forms are created using drag-and-drop techniques. A tool is used to place controls (e.g., text boxes, buttons, etc.) on the form (window). Controls have attributes and event handlers associated with them. Default values are provided when the control is created, but may be changed by the programmer. Many attribute values can be modified during run time based on user actions or changes in the environment, providing a dynamic application. For example, code can be inserted into the form resize event handler to reposition a control so that it remains centered on the form, expands to fill up the form, etc. By inserting code into the event handler for a keypress in a text box, the program can automatically translate the case of the text being entered, or even prevent certain characters from being inserted.

Visual Basic can create executables (EXE files), ActiveX controls, or DLL files, but is primarily used to develop Windows applications and to interface with database systems. Dialog boxes with less functionality can be used to provide pop-up capabilities. Controls provide the basic functionality of the application, while programmers can insert additional logic within the appropriate event handlers. For example, a drop-down combination box automatically displays a list. When the user selects an element, an event handler is called that executes code that the programmer created to perform the action for that list item. Alternatively, a Visual Basic component can have no user interface, and instead provide ActiveX objects to other programs via Component Object Model (COM). This allows for server-side processing or an add-in module.

The runtime recovers unused memory using reference counting, which depends on variables passing out of scope or being set to Nothing, avoiding the problem of memory leaks that are possible in other languages. There is a large library of utility objects, and the language provides basic support for object-oriented programming. Unlike many other programming languages, Visual Basic is generally not case-sensitive—though it transforms keywords into a standard case configuration and forces the case of variable names to conform to the case of the entry in the symbol table. String comparisons are case sensitive by default. The Visual Basic compiler is shared with other Visual Studio languages (C, C++). Nevertheless, by default the restrictions in the IDE do not allow creation of some targets (Windows model DLLs) and threading models, but over the years, developers have bypassed these restrictions.

Characteristics

The code windows in Visual Basic, showing a function using the If, Then, Else and Dim statements
The code windows in Visual Basic, showing a function using the If, Then, Else and Dim statements

Visual Basic builds upon the characteristics of BASIC.

OPTION BASE was introduced by ANSI, with the standard for ANSI Minimal BASIC in the late 1970s.

History

Alan Cooper created the drag-and-drop design for the user interface of Visual Basic.
Alan Cooper created the drag-and-drop design for the user interface of Visual Basic.

Visual Basic 1.0 was introduced in 1991. The drag and drop design for creating the user interface is derived from a prototype form generator developed by Alan Cooper and his company called Tripod.[21][22][23] Microsoft contracted with Cooper and his associates to develop Tripod into a programmable form system for Windows 3.0, under the code name Ruby (no relation to the later Ruby programming language). Tripod did not include a programming language at all. Microsoft decided to combine Ruby with the Basic language to create Visual Basic. The Ruby interface generator provided the "visual" part of Visual Basic, and this was combined with the "EB" Embedded BASIC engine designed for Microsoft's abandoned "Omega" database system. Ruby also provided the ability to load dynamic link libraries containing additional controls (then called "gizmos"), which later became the VBX interface.[24]

Timeline

Visual Basic for MS-DOS
Visual Basic for MS-DOS
VB DOS icon
VB DOS icon

1990s

2000s

Derivative languages

Microsoft has developed derivatives of Visual Basic for use in scripting. Visual Basic itself is derived heavily from BASIC, and subsequently has been replaced with a .NET platform version.

Some of the derived languages are:

Performance and other issues

Earlier versions of Visual Basic (prior to version 5) compiled the code to P-Code only. The P-Code is interpreted by the language runtime. The benefits of P-Code include portability and smaller binary file sizes, but it usually slows down the execution, since having a runtime adds an additional layer of interpretation. Visual Basic applications require Microsoft Visual Basic runtime MSVBVMxx.DLL, where xx is the relevant version number, either 50 or 60. MSVBVM60.dll comes as standard with Windows in all editions from Windows 98 to Windows 10 (some editions of Windows 7 do not include it). A Windows 95 machine would however require inclusion with the installer of whichever DLL was needed by the program. Visual Basic 5 and 6 can compile code to either native or P-Code but in either case the runtime is still required for built in functions and forms management.

Criticisms levelled at Visual Basic editions prior to VB.NET include:[31]

Legacy development and support

All versions of the Visual Basic development environment from 1.0 to 6.0 were retired by Microsoft by 2008, and are therefore no longer supported. The associated runtime environments are also unsupported, except for the Visual Basic 6 core runtime environment, which Microsoft officially supports for the lifetime of Windows 8,[34] Windows 10[35] and Windows 11.[36] Third party components that shipped with Visual Studio 6.0 are not included in this support statement. Some legacy Visual Basic components may still work on newer platforms, despite being unsupported by Microsoft and other vendors. Documentation for Visual Basic 6.0, its application programming interface and tools is best covered in the last MSDN release before Visual Studio.NET 2002. Later releases of MSDN focused on .NET development and had significant parts of the Visual Basic 6.0 programming documentation removed as the language evolved, and support for older code ended. Although vendor support for Visual Basic 6 has ended, and the product has never been supported on the latest versions of Windows, key parts of the environment still work on newer platforms. It is possible to get a subset of the development environment working on 32-bit and 64-bit versions of Windows Vista, Windows 7, Windows 8, Windows 10 and Windows 11.[37]

Example code

The following code snippet displays a message box saying "Hello, World!" as the window loads:

Private Sub Form_Load()
    ' Execute a simple message box that says "Hello, World!"
    MsgBox "Hello, World!"
End Sub

This snippet makes a counter that moves up 1 every second (a label and a timer control need to be added to the form for this to work) until the form is closed or an integer overflow occurs:

Option Explicit
Dim Count As Integer
Private Sub Form_Load()
    Count = 0
    Timer1.Interval = 1000 ' units of milliseconds
End Sub
Private Sub Timer1_Timer()
    Count = Count + 1
    Label1.Caption = Count
End Sub

See also

References

  1. ^ Classic Visual Basic | TIOBE - The Software Quality Company
  2. ^ Root, Randal; Romero Sweeney, Mary (2006). A tester's guide to .NET programming. Apress. p. 3. ISBN 978-1-59059-600-5. You can choose a language based on how easy it is to learn. For beginners, Visual Basic is a good choice. [~snip] A big advantage of Visual Basic is that it is a popular language since it is easy to learn.
  3. ^ Plant, Robert T.; Murrell, Stephen (2007). An executive's guide to information technology. Cambridge University Press. p. 343. ISBN 978-0-521-85336-1. Summary of positive issues: Visual Basic is easy to learn and widely available.
  4. ^ a b ISpliter (14 January 2014). "Visual Basic 6.0: A giant more powerful than ever". CodeProject.com. Retrieved 3 April 2014.
  5. ^ violent, ken. "vkControls : 16 GRAPHICALS usercontrols ! NEVER SEEN before!". PSC. Retrieved 5 April 2014.
  6. ^ Krool. "CommonControls (Replacement of the MS common controls)". VBForums. Retrieved 5 April 2014.
  7. ^ PSC. "Visual Basic 6.0 third party components for modern standards (a review)". Planet Source Code. Retrieved 4 April 2014.
  8. ^ Jeff, Martin. "Visual Basic 6 Renewed to Run on Windows 8". INFOQ. Retrieved 5 April 2014.
  9. ^ "Support Statement for Visual Basic 6.0 on Windows (updated with Windows 10 version 1709 support information)". Microsoft. Retrieved 2015-10-15.
  10. ^ "Stack Overflow Developer Survey 2016". Stack Overflow. 2016. Retrieved 2020-12-18.((cite web)): CS1 maint: url-status (link)
  11. ^ "Stack Overflow Developer Survey 2017". Stack Overflow. 2017. Retrieved 2020-12-18.((cite web)): CS1 maint: url-status (link)
  12. ^ "Stack Overflow Developer Survey 2018". Stack Overflow. 2018. Retrieved 2020-12-18.((cite web)): CS1 maint: url-status (link)
  13. ^ "VBA for Office Developers". Microsoft.
  14. ^ "Tip 2: Use line numbers in your source code. : Visual Basic".
  15. ^ Microsoft Visual Basic Programmer's Guide Version 3.0 - Microsoft Corporation 1993
  16. ^ Visual Studio.NET Lexical Grammar - Microsoft.com Reference Visual Basic Language
  17. ^ Loop Structures (Visual Basic) - Microsoft.com Visual Basic Programming Guide. Last updated December 4, 2017
  18. ^ In most languages, True is mapped to a non-zero numeric value, often 1 or -1.
  19. ^ "Microsoft Basic Logical Expression Evaluation". Vb.mvps.org. Retrieved 2009-06-16.
  20. ^ "PRB: Round Function different in VBA 6 and Excel Spreadsheet". Microsoft Support. Archived from the original on 2013-10-29. Retrieved 2014-01-25.
  21. ^ Cooper, Alan (22 April 1996). "Why I am "the father of Visual Basic"". Retrieved 8 March 2017.
  22. ^ "Alan Cooper Receiving the Windows Pioneer Award 1994". YouTube. September 23, 2010. Event occurs at 4:25Bill Gates: "A lot of people have called you the father of Visual Basic. What do you think about that?"((cite web)): CS1 maint: postscript (link)
  23. ^ Lohr, Steve (2008). Go To: The Story of the Math Majors, Bridge Players, Engineers, Chess Wizards, Maverick Scientists, and Ico (revised ed.). Basic Books. p. 96. ISBN 9780786730766. Cooper ... gained industry recognition as the "Father of Visual Basic." (Microsoft's lawyers once sent Cooper a cease-and-desist order, demanding that he stop using that title. But after Cooper complained, Gates patched things up and even lauded him as a "Windows Pioneer" at an industry conference.)
  24. ^ "The Birth of Visual Basic". Rian " Petot " Danao I <3 19
  25. ^ George, Mack. "History of Visual Basic". June 2002. George Mack, 3rd edition, Copyright June 2002. Retrieved 10 April 2014.
  26. ^ www.insteptech.com (2005-07-22). "What's new in VB6?". www.insteptech.com.
  27. ^ "Support Statement for Visual Basic 6.0 on Windows". Microsoft. 2018-01-17. Retrieved 2019-06-20.
  28. ^ "Product Family Life Cycle Guidelines for Visual Basic 6.0". Msdn2.microsoft.com. 2005-03-31. Retrieved 2009-06-16.
  29. ^ "Compatibility Between the 32-bit and 64-bit Versions of Office 2010". Microsoft Corporation. Retrieved 16 July 2012.
  30. ^ Piquet, Lori (2002-02-20). "Abandoning the Fantasy of VB Migration Wizardry". DevX.com. Jupitermedia. Retrieved 2007-05-17.
  31. ^ Alex Homer; Dave Sussman; Rob Howard; Brian Francis; Karli Watson; Richard Anderson (2004). Professional ASP.NET 1.1. Wiley. p. 71. ISBN 0-7645-5890-0. Retrieved 2008-10-08.
  32. ^ Marc D'Aoust (December 2000). "Avoid Writing Tedious, Boring Code". Microsoft. Retrieved 2008-11-10.
  33. ^ Andrew Troelsen (2008). Pro VB 2008 and the .NET 3.5 Platform: The expert's voice in .NET. Apress. p. 5. ISBN 978-1-59059-822-1.
  34. ^ Platt, David (2012-06-01). "Don't Get Me Started – The Silent Majority: Why Visual Basic 6 Still Thrives". MSDN Magazine. Retrieved 2012-06-09.
  35. ^ Denning, Adam (2015-06-22). "Getting ready for Windows 10 – SDKs, compatibility, bridges". Building Apps for Windows blog. Retrieved 2015-08-02.
  36. ^ paulyuk. "Support Statement for Visual Basic 6.0". docs.microsoft.com. Retrieved 2022-07-26.
  37. ^ Dan, Brust (14 September 2015). "Installing Visual Basic/Studio 6 on Windows 10". danbrust.net.