View source for Visual Basic (classic)

{{Short description|Microsoft's programming language based on BASIC and COM}}
{{About|the Visual Basic language that shipped with Microsoft Visual Studio pre-.NET|the current Visual Basic language, based on .NET|Visual Basic (.NET)}}
{{Distinguish|VBScript}}

{{Infobox programming language
| name = Visual Basic
| logo = File:Visual Basic 6.0 logo.png
| logo_size = 210px
| screenshot = Visual Basic 6.0 on Windows XP.png
| screenshot caption = Visual Basic 6.0 [[Integrated development environment|IDE]] running on [[Windows XP]]
| paradigm = [[Object-based language|Object-based]] and [[event-driven programming|event-driven]]
| released = {{Start date and age|1991|5}}
| designer = 
| developer = [[Microsoft]]
| latest_release_version = 6.0
| latest_release_date = {{Start date and age|1998}}
| typing = [[Static type|Static]], [[Strongly-typed programming language|strong]]
| implementations = [[Microsoft Visual Studio]]
| dialects = 
| influenced_by = [[BASIC]], [[Microsoft BASIC]], [[QBasic]]
| influenced = [[Visual Basic .NET]], [[Visual Basic for Applications]], [[Windows Forms]], [[Gambas]], [[Xojo]], [[Basic4ppc]], [[Basic4android]], and [[NS Basic]]
| operating_system = [[Microsoft Windows]] and [[MS-DOS]]
| license = 
| website = {{URL|https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/visual-basic-6.0-documentation}}
| discontinued = yes
}}

'''Visual Basic''' (VB) before [[.NET]], sometimes referred to as '''Classic Visual Basic''',<ref>{{Cite web|title=The Classic Visual Basic Programming Language|url=https://www.tiobe.com/tiobe-index/classic-visual-basic/|access-date=2023-02-07|website=TIOBE|language=en-US}}</ref>
<ref>{{Cite web|title=Classic VB|url=https://visualstudiomagazine.com/articles/list/classic-vb.aspx|access-date=2024-08-29|website=Visual Studio Magazine|language=en-US}}</ref>
is a [[third-generation programming language|third-generation]] [[programming language]], based on [[BASIC]], and an [[integrated development environment]] (IDE), from [[Microsoft]] for [[Windows]] known
for supporting [[rapid application development]] (RAD) of [[graphical user interface]] (GUI) applications, [[event-driven programming]] and both consumption and development of 
[[Component-based software engineering|components]] via the [[Component Object Model]] (COM) technology. 

VB was first released in 1991. The final release was version 6 (VB6) in 1998. On April 8, 2008, Microsoft stopped supporting the VB6 IDE, relegating it to [[legacy system|legacy]]. The Microsoft VB team still maintains compatibility for VB6 applications through its "It Just Works" program on supported Windows operating systems.<ref>{{cite web | url=https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/visual-basic-6-support-policy |title=Support Statement for Visual Basic 6.0 on Windows (updated with Windows 10 version 1709 support information) |publisher=Microsoft |access-date=2015-10-15}}</ref>

Microsoft significantly changed VB for the .NET technology and rebranded it [[Visual Basic .NET]] (VB.NET), and then later rebranded it back to ''Visual Basic''. Therefore, ''Visual Basic'' can refer to a classic version, a .NET version or both. This article is about the versions before .NET.

Just as BASIC was originally intended to be easy to learn, Microsoft intended the same for VB.<ref>{{Cite book
  |title = A tester's guide to .NET programming
  |publisher = [[Apress]]
  |year = 2006
  |first1 = Randal
  |last1 = Root
  |first2 = Mary
  |last2 = Romero Sweeney
  |isbn = 978-1-59059-600-5
  |page = 3
  |quote = 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.
}}</ref><ref>{{Cite book
  |title = An executive's guide to information technology
  |url = https://archive.org/details/executivesguidet00plan
  |url-access = limited
  |publisher = [[Cambridge University Press]]
  |year = 2007
  |isbn = 978-0-521-85336-1
  |first1 = Robert T.
  |last1 = Plant
  |first2 = Stephen
  |last2 = Murrell
  |page = [https://archive.org/details/executivesguidet00plan/page/n354 343]
  |quote = Summary of positive issues: Visual Basic is easy to learn and widely available.
}}</ref>

Development of a VB application is exclusively supported via the VB [[integrated development environment]] (IDE) {{endash}} an application in the Visual Studio suite of tools of that era. Unlike modern versions of [[Visual Studio]] that support many languages including VB (.NET), the VB IDE supports just VB.

In 2014, some [[software developer]]s still preferred Visual Basic 6.0 over its successor, [[Visual Basic .NET]].<ref name="ISpliter" />  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.<ref>{{Cite web|last=|first=|date=2016|title=Stack Overflow Developer Survey 2016|url=https://insights.stackoverflow.com/survey/2016#technology-most-loved-dreaded-and-wanted|archive-url=|archive-date=|access-date=2020-12-18|website=[[Stack Overflow]]}}</ref><ref>{{Cite web|last=|first=|date=2017|title=Stack Overflow Developer Survey 2017|url=https://insights.stackoverflow.com/survey/2017#most-loved-dreaded-and-wanted|archive-url=|archive-date=|access-date=2020-12-18|website=[[Stack Overflow]]}}</ref><ref>{{Cite web|last=|first=|date=2018|title=Stack Overflow Developer Survey 2018|url=https://insights.stackoverflow.com/survey/2018#most-loved-dreaded-and-wanted|archive-url=|archive-date=|access-date=2020-12-18|website=[[Stack Overflow]]}}</ref>

==Overview==

As was the intention of older [[BASIC]] variants, VB was intended to have a low [[learning curve]]. Further, the IDE was intended to promote productivity; even for complex [[Graphical user interface|GUI]] applications. Programming involves ''visually'' arranging [[GUI widget|component]]s or [[GUI widget|control]]s on a [[Form (programming)|form]], specifying attributes and actions for those components, and writing [[Source code|code]] that directs behavior. Since components have default attributes and actions, 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 made this less of an issue.
<!-- 32-bit and single-threaded --> 

Since a VB program is compiled as a native code [[executable]] instead of interpreted as old BASIC variants, it runs relatively fast and requires relatively little storage space. But, [[#Timeline of Visual Basic (VB1 to VB6)|from version 5 on]], it requires relatively large library files to be loaded at runtime; about 1&nbsp;MB. Core runtime libraries are included by default in [[Windows 2000]] and later, but extended runtime components require extra installation consideration. Earlier versions of [[Microsoft Windows]] (95/98/NT), require the runtime libraries to be distributed with the executable.
[[File:Form vide VB.JPG|thumb|left|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 [[Attribute (computing)|attribute]]s and [[event handler]]s 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.

Development in the IDE is organized as a ''project'' which can be configured to output as a [[computer program|program]] ([[EXE]]), a [[dynamic-link library]] (DLL) or an [[ActiveX|ActiveX control library]] (OCX) which is a specialized a DLL.

Controls provide the graphical functionality of a GUI application, and programmers attach code to event handlers to perform actions. For example, a drop-down control displays a list of items. When the user selects an item, an event handler is automatically called that executes the code that the programmer attached to the handler.

For a DLL, the VB code generally provides no user interface, and instead provides COM objects to other programs. This allows for capabilities such as [[server-side]] processing or an add-in module.

Via the COM technology, unused memory is recovered for reuse using [[reference counting]]; recovering when the count reaches zero. VB reduces the count when a variable goes out of scope or when assigned to <code>Nothing</code>. This design prevents [[memory leak]]s that plague some, older languages such as C & C++. It differs significantly from the more modern approach of [[Garbage collection (computer science)|garbage collection]].

VB provides a large library of utility objects, and it provides basic support for [[object-oriented programming]]. 

Unlike many other programming languages, VB code is not [[case-sensitive]] {{endash}} though the IDE transforms [[Keyword (computer programming)|keywords]] into a standard case and variable names to match the case used elsewhere in the project. Of note, [[String (computer science)|string]] comparison is case sensitive by default. 

The VB compiler is shared with other Visual Studio suite languages, C and 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.

==Features==
[[File:Visual Basic function.PNG|thumb|A function using the If, Then, Else and Dim statements]]

Visual Basic has notable features and characteristics that are in some cases different than other BASIC variants or from other common languages:

* Enables [[rapid application development]] (RAD) of [[graphical user interface]] (GUI) applications, access to [[database]]s using [[Jet Data Access Objects]], [[Remote Data Objects]], or [[ActiveX Data Object]] (ADO), and creation of [[ActiveX]] controls and COM objects.

* Supports [[event-driven programming]]

* Allows use of the [[Windows API]] via an external function declaration technology

* Supports sharing and reuse via the COM [[component-based software engineering|component]] technology. A [[programmer]] can create an application using components provided by VB, developed internally or from third parties. Over time the development community produced and shared many components.<ref name="ISpliter">{{cite web|last=ISpliter|title=Visual Basic 6.0: A giant more powerful than ever|date=14 January 2014|url=http://www.codeproject.com/Articles/710181/Visual-Basic-6-0-A-giant-more-powerful-than-ever|publisher=CodeProject.com|access-date=3 April 2014}}</ref><ref>{{cite web|last=violent|first=ken|title=vkControls : 16 GRAPHICALS usercontrols ! NEVER SEEN before!|url=http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=68734&lngWId=1|publisher=PSC|access-date=5 April 2014}}</ref><ref>{{cite web|last=Krool|title=CommonControls (Replacement of the MS common controls)|url=http://www.vbforums.com/showthread.php?698563-CommonControls-(Replacement-of-the-MS%20-common-controls)|publisher=VBForums|access-date=5 April 2014}}</ref><ref>{{cite web|last=PSC|title=Visual Basic 6.0 third party components for modern standards (a review)|url=http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=75311&lngWId=1|publisher=Planet Source Code|access-date=4 April 2014}}</ref><ref>{{cite web|last=Jeff|first=Martin|title=Visual Basic 6 Renewed to Run on Windows 8|url=http://www.infoq.com/news/2012/02/vb6_supported_on_win8|publisher=INFOQ|access-date=5 April 2014}}</ref>

* Unlike older BASIC variants, instead of requiring line numbers to support branching, code is grouped into named blocks delimited by ''Sub...End Sub'' or ''Function...End Function''. VB retains line number support<ref>{{Cite web|url=https://www.brainbell.com/tutors/Visual_Basic/Tip_2_Use_line_numbers_in_your_source_code.htm|title = Tip 2: Use line numbers in your source code. : Visual Basic}}</ref>

* Code statements have no terminating character other than a line ending (carriage return/line feed), and versions since 3 allow for multi-line statements for concatenation of strings or explicitly using the underscore character (_) at the end of a line<ref>Microsoft Visual Basic Programmer's Guide Version 3.0 - Microsoft Corporation 1993</ref><ref>{{Cite web|title=Visual Studio 2003 Retired Technical documentation|url=https://www.microsoft.com/en-us/download/details.aspx?id=55979|access-date=2023-02-07|website=Microsoft Download Center|language=en-us}}</ref>

* A code comment is denoted by a single apostrophe (') character, like: {{code|' This is a comment}}

* Looping statement blocks begin and end with keywords: ''Do...Loop, While...End While, For...Next'' <ref>{{Cite web|author = Kathleen Dollard|display-authors=etal|title=Loop Structures - Visual Basic|url=https://docs.microsoft.com/en-us/dotnet/visual-basic/programming-guide/language-features/control-flow/loop-structures|access-date=December 4, 2017|website=learn.microsoft.com|language=en-us}}</ref>

* Chained variable assignment is not allowed; for example <code>A = B = C</code> does not result in the values of A, B and C being equal. The [[Boolean data type|Boolean]] result of "is B equal to C?" is stored in A

* Like other BASIC variants, but unlike many other languages that use 1, Boolean <code>True</code> has numeric value −1. VB stores a Boolean as a [[two's complement]] signed integer with all ones in binary for true and zero for false. This is apparent when performing a (bitwise) <code>Not</code> operation on the two's complement value 0, which returns the two's complement value −1, in other words <code>True = Not False</code>. This inherent functionality becomes especially useful when performing logical operations on the individual bits of an integer such as <code>And</code>, <code>Or</code>, <code>Xor</code> and <code>Not</code>.<ref>{{cite web |url=http://vb.mvps.org/tips/Truth.asp |title=Microsoft Basic Logical Expression Evaluation |publisher=Vb.mvps.org |access-date=2009-06-16 |archive-date=2009-08-23 |archive-url=https://web.archive.org/web/20090823005932/http://vb.mvps.org/tips/Truth.asp |url-status=dead }}</ref> This definition of <code>True</code> is also consistent with BASIC since the early 1970s Microsoft BASIC implementation and is also related to the characteristics of CPU instructions at the time.

* Logical and bitwise operators are unified. This is unlike some C-derived languages (such as [[Perl]]), which have separate logical and bitwise operators. This is a traditional feature of BASIC.

* Unlike for many languages which use zero for the lower bound of an [[Array data type|array]], VB allows the lower bound to be any value {{endash}} like in [[Pascal (programming language)|Pascal]] and [[Fortran]]. The <code>Option Base</code> statement can be used to set the default lower bound, but some claim that its use leads to confusion when reading code and is best avoided by always explicitly specifying the lower bound. This uncommon language trait does exist in [[Visual Basic .NET]] but not in [[VBScript]].
: <code>OPTION BASE</code> was introduced by ANSI, with the standard for ANSI Minimal BASIC in the late 1970s.

* Tightly bound to the [[Microsoft Windows|Windows operating system]] and the [[Component Object Model]]. The native types for strings and arrays are the dedicated COM types, BSTR and SAFEARRAY.

* [[Banker's rounding]] as the default behavior when converting real numbers to integers with the <code>Round</code> function.<ref>{{cite web |url=http://support.microsoft.com/kb/194983 |title=PRB: Round Function different in VBA 6 and Excel Spreadsheet |website=Microsoft Support |access-date=2014-01-25 |archive-url=https://web.archive.org/web/20131029200859/http://support.microsoft.com/kb/194983 |archive-date=2013-10-29 |url-status=dead }}</ref>  <code>? Round(2.5, 0)</code> gives 2, <code>? Round(3.5, 0)</code> gives 4.

* An integer type value is automatically promoted to a floating point type in expressions that involve the normal division operator (<code>/</code>) so that division of one integer by another produces a result that may seem more intuitive from a mathematical perspective. VB provides an integer divide operator (<code>\</code>) that does truncate.

* By default, if a variable has not been declared or if no type declaration character is specified, it acts like a <code>[[Variant type (COM)|variant]]</code>. However this can be changed with Deftype statements such as <code>DefInt</code>, <code>DefBool</code>, <code>DefVar</code>, <code>DefObj</code>, <code>DefStr</code>. There are 12 <code>Deftype</code> statements in total offered by Visual Basic 6.0. The default type may be overridden for a specific declaration by using a special suffix character on the variable name (<code>#</code> for Double, <code>!</code> for Single, <code>&</code> for Long, <code>%</code> for Integer, <code>$</code> for String, and <code>@</code> for Currency) or using the key phrase <code>As (type)</code>. VB can be setup to require variable declarations via <code>Option Explicit</code>.

==History==
[[File:AlanCooper.jpg|thumb|upright|Alan Cooper created the drag-and-drop design for the user interface of Visual Basic.]]

''[[BYTE]]'' reported in 1989 that, based on its experience with Macintosh software development, Microsoft "wants to provide a development environment that mimics the delivery environment". BASIC's string handling was preferable to C, the company's Greg Lobdell said, when developing the mostly transaction-processing applications Microsoft expected [[object-oriented programming]] tools to create.<ref name="microbytes198902">{{Cite magazine |date=February 1989 |title=BASIC Will Be the "Embedded Language" of Microsoft Applications |url=https://archive.org/details/eu_BYTE-1989-02_OCR/page/n15/mode/1up?view=theater |access-date=2024-10-08 |magazine=BYTE |page=12}}</ref> 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''.<ref>{{cite web|last=Cooper|first=Alan|title=Why I am "the father of Visual Basic"|url=https://www.cooper.com/alan/father_of_vb.html|date=22 April 1996|access-date=8 March 2017|archive-date=9 March 2017|archive-url=https://web.archive.org/web/20170309062139/https://www.cooper.com/alan/father_of_vb.html|url-status=dead}}</ref><ref>{{cite web
 |title      = Alan Cooper Receiving the Windows Pioneer Award 1994
 |date       = September 23, 2010
 |website    = [[YouTube]]
 |url        = https://www.youtube.com/watch?v=BOKtFr_YOxk&t=265
 |time       = 4:25
 |postscript = Bill Gates: "A lot of people have called you the father of Visual Basic. What do you think about that?"
}}</ref><ref>{{cite book
 |title     = Go To: The Story of the Math Majors, Bridge Players, Engineers, Chess Wizards, Maverick Scientists, and Ico
 |first     = Steve |last = Lohr
 |year      = 2008
 |edition   = revised
 |publisher = Basic Books
 |isbn      = 9780786730766
 |page      = 96
 |url       = https://books.google.com/books?id=XfPLVx6qS_cC&q=%22Windows+Pioneer%22+cooper+site+microsoft.com&pg=PA96
 |quote     = 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.)
}}</ref> 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)|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 library|dynamic link libraries]] containing additional controls (then called "gizmos"), which later became the [[Visual Basic Extension|VBX]] interface.<ref>{{cite web| url=http://www.forestmoon.com/BIRTHofVB/BIRTHofVB.html| title = The Birth of Visual Basic}} Rian " Petot " Danao I <3 19</ref>

===Timeline===
[[File:Microsoft Visual Basic for MS-DOS (Professional Edition Version1.00).png|thumb|Visual Basic for MS-DOS]]
[[File:VBDOS-icon.PNG|thumb|VB DOS icon]]

* Project 'basic Thunder' was initiated in 1990.<ref>{{cite web|last=George|first=Mack|title=History of Visual Basic|url=http://www.ojodepez-fanzine.net/network/qbdl/history_of_visual_basic.html|work=June 2002|publisher=George Mack, 3rd edition, Copyright June 2002|access-date=10 April 2014}}</ref> Thunder persisted through to the last release of Visual Basic in the name of the primary internal function, "ThunderRTMain".

* Visual Basic 1.0 (May 1991) was released for Windows at the Comdex/Windows World trade show in Atlanta, Georgia.

* Visual Basic 1.0 for [[DOS]] was released in September 1992. The language itself was not quite compatible with Visual Basic for Windows, as it was the next version of Microsoft's DOS-based BASIC compilers, [[QuickBASIC]] and BASIC Professional Development System. The interface used a [[text-based user interface]], using [[extended ASCII]] characters to simulate the appearance of a [[graphical user interface|GUI]].

* Visual Basic 2.0 was released in November 1992. The programming environment was easier to use, and its speed was improved. Notably, forms became instantiable objects, thus laying the foundational concepts of class modules as were later offered in VB4.

* Visual Basic 3.0 was released in the summer of 1993 and came in Standard and Professional versions. VB3 included version 1.1 of the [[Jet Database Engine]] that could read and write Jet (or Access) 1.x databases.

* Visual Basic 4.0 (August 1995) was the first version that could create [[32-bit]] as well as [[16-bit]] Windows programs. It has three editions; Standard, Professional, and Enterprise. It also introduced the ability to write non-GUI classes in Visual Basic. With VB4 the language was separated from the GUI library, and made available as VBA, in which form it was embedded with the Office 95 suite. To ease migration of Office macros and scripts, features from WordBasic, Excel Basic and Access Basic were incorporated into the language. Incompatibilities between different releases of VB4 caused installation and operation problems. While previous versions of Visual Basic had used VBX controls, Visual Basic now used OLE controls (with files names ending in .OCX) instead. These were later to be named ActiveX controls.

* With version 5.0 (February 1997), Microsoft released Visual Basic exclusively for [[32-bit]] versions of Windows. Programmers who preferred to write 16-bit programs were able to import programs written in Visual Basic 4.0 to Visual Basic 5.0, and Visual Basic 5.0 programs can easily be converted to Visual Basic 4.0. Visual Basic 5.0 also introduced the ability to create custom user controls, as well as the ability to compile to native Windows executable code, speeding up calculation-intensive code execution. A free, downloadable Control Creation Edition was also released for creation of [[ActiveX|ActiveX control]]s. It was also used as an introductory form of Visual Basic: a regular .exe project could be created and run in the IDE, but not compiled.

* Visual Basic 6.0 (Mid-1998) improved in a number of areas<ref>{{cite web| url=http://www.insteptech.com/techLibrary/vbClassic/vb6_news.htm| title = What's new in VB6? | publisher = www.insteptech.com | author = www.insteptech.com | date = 2005-07-22}}</ref> including the ability to create web-based applications.

* Mainstream Support for Microsoft Visual Basic 6.0 ended on March 31, 2005, and ''Extended'' support ended in March 2008.<ref>{{cite web|url=http://msdn2.microsoft.com/en-us/vbrun/ms788707.aspx |title=Product Family Life Cycle Guidelines for Visual Basic 6.0 |publisher=Msdn2.microsoft.com |date=2005-03-31 |access-date=2009-06-16}}</ref> However, primary components of the Visual Basic 6 ''development'' environment run in all 32-bit versions of Windows up to and including Windows 11.<ref>{{cite web|url=https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/visual-basic-6-support-policy|title=Support Statement for Visual Basic 6.0 on Windows|publisher=Microsoft|date=2018-01-17|access-date=2019-06-20}}</ref>
{{Clear}}

==Derivative technologies==

[[Microsoft]] developed many derivatives of VB (classic), including:

* [[Visual Basic .NET]] is Microsoft's successor to Visual Basic 6.0, and part of Microsoft's [[.NET]] ecosystem (which over time has sometimes been called framework and core). It is not [[backward compatibility|backwards compatible]] with Visual Basic 6.0. An automated conversion tool exists, but fully automated conversion for most projects is not possible.<ref>{{cite web
|url = http://www.devx.com/vb/article/16822
|title = Abandoning the Fantasy of VB Migration Wizardry
|access-date = 2007-05-17
|last = Piquet
|first = Lori
|date = 2002-02-20
|work = DevX.com
|publisher = Jupitermedia
|archive-date = 2007-05-19
|archive-url = https://web.archive.org/web/20070519090414/http://www.devx.com/vb/article/16822
|url-status = dead
}}</ref>

* [[Visual Basic for Applications]] (VBA)<ref>{{cite web | title = VBA for Office Developers | publisher = Microsoft | url = http://msdn.microsoft.com/en-us/office/ff688774.aspx}}</ref> is a [[scripting language]] embedded in many Microsoft applications such as [[Microsoft Office]], and third-party products like [[SolidWorks]], [[AutoCAD]], [[WordPerfect Office|WordPerfect Office 2002]], [[ArcGIS]], [[Sage 300 ERP]], and Business Objects Desktop Intelligence. There are small inconsistencies in the way VBA is implemented in different applications, but it is largely the same language as Visual Basic 6.0 and uses the same runtime library. Visual Basic development ended with 6.0, but in 2010 Microsoft introduced VBA 7 to provide extended features and add 64-bit support.<ref name="VBA 7">{{cite web|title=Compatibility Between the 32-bit and 64-bit Versions of Office 2010|url=http://msdn.microsoft.com/en-us/library/ee691831.aspx|publisher=Microsoft Corporation|access-date=16 July 2012}}</ref>

* [[VBScript]] is the default language for [[Active Server Pages]].  It can be used in [[Microsoft Windows|Windows]] scripting and client-side [[web page]] scripting. It resembles VB in [[Syntax (programming languages)|syntax]],  but is a separate language—executed by vbscript.dll instead of the VB runtime.  ASP and VBScript should not be confused with [[ASP.NET]], which uses the [[.NET Framework]] for compiled web pages.

* [[OpenOffice Basic]] is a Visual Basic compatible interpreter that originated in [[StarOffice]] office suite.

* [[Gambas]] is a Visual Basic inspired [[free software]] programming language for the Linux operating system. It is not a clone of Visual Basic, but it does have the ability to convert Visual Basic programs to Gambas.

* [[LotusScript]] is a VBA variant available in [[Lotus SmartSuite]] and [[Lotus Notes]].

* Later versions of [[Corel WordPerfect Office]] implement access to VBA as one of the macro/scripting languages, the other major ones being [[CorelScript]] and [[PerfectScript]].

* Earlier versions of [[Microsoft Word]] use a variant of VB called [[WordBasic]].

==Issues==

===Performance===

Versions before 5 compiled the code to [[Microsoft P-Code|P-Code]] {{endash}} which is interpreted at runtime. The benefits of P-Code include portability and smaller binary file sizes, but it usually slows execution, since an interpreter adds a layer to the execution environment. VB applications require the Microsoft VB runtime MSVBVM##.DLL, where ## is a version number, either 50 or 60. MSVBVM60.dll comes standard with Windows in all editions from Windows 98 to Windows 11 although some editions of Windows 7 do not include it. For Windows 95 however the application installation process requires the DLL needed by the program. VB 5 and 6 can compile code to either native or P-Code but the runtime is still required for built-in functions and forms management.

===Other===

Criticisms of VB (prior to VB.NET) include:<ref>{{cite book|url=https://archive.org/details/professionalaspn00home|url-access=registration|title=Professional ASP.NET 1.1|author1=Alex Homer |author2=Dave Sussman |author3=Rob Howard |author4=Brian Francis |author5=Karli Watson |author6=Richard Anderson |year=2004|isbn=0-7645-5890-0|publisher=Wiley|access-date=2008-10-08|page=[https://archive.org/details/professionalaspn00home/page/71 71]}}</ref>

* versioning problems associated with DLLs, known as "[[DLL hell]]"
* poor support for [[object-oriented programming]]<ref>{{cite web|url=http://msdn.microsoft.com/en-us/library/aa227881(VS.60).aspx|title=Avoid Writing Tedious, Boring Code|publisher=[[Microsoft]]|date=December 2000|author=Marc D'Aoust|access-date=2008-11-10}}</ref>
* can only create multi-[[thread (computer science)|threaded]] applications using ActiveX or DLL
* [[variant type]]s having a greater performance and storage "overhead" than [[strong and weak typing|strongly-typed programming language]]s
* dependency on complex and fragile COM registry entries<ref>{{cite book|url=https://books.google.com/books?id=y0uURUiVhgwC|title=Pro VB 2008 and the .NET 3.5 Platform: The expert's voice in .NET|publisher=Apress|year=2008|author=Andrew Troelsen|isbn=978-1-59059-822-1|page=5}}</ref>

==Legacy development and support==

All versions of the Visual Basic IDE, from 1.0 to 6.0, are no longer supported by Microsoft. 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 10]]<ref>{{cite web|url=http://blogs.windows.com/buildingapps/2015/06/22/getting-ready-for-windows-10-sdks-compatibility-bridges/ |title=Getting ready for Windows 10 – SDKs, compatibility, bridges |author=Denning, Adam |publisher=Building Apps for Windows blog |date=2015-06-22 |access-date=2015-08-02}}</ref> and [[Windows 11]].<ref>{{Cite web |last=paulyuk |title=Support Statement for Visual Basic 6.0 |url=https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/visual-basic-6-support-policy |access-date=2022-07-26 |website=docs.microsoft.com |language=en-us}}</ref> 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.<ref>{{cite web|url=http://blog.danbrust.net/2015/09/14/installing-visual-basic-studio-6-on-windows-10/|title=Installing Visual Basic/Studio 6 on Windows 10|first=Brust|last=Dan|date=14 September 2015|website=danbrust.net}}</ref> Owing to its persistent remaining popularity,<ref>{{cite web|url=https://visualstudiomagazine.com/articles/2020/07/07/tiobe-july-2020-vb.aspx|title=Popularity Index: Classic Visual Basic Hangs In There|first=David|last=Ramel|date=2020-07-07|access-date=2023-03-28}}</ref> third-party attempts to further support it, such as Rubberduck, exist.<ref>{{cite web|url=https://visualstudiomagazine.com/articles/2020/02/28/rubberduck.aspx|title=Visual Basic Resurgence? Project Seeks to 'Bring the VBE into This Century!'|first=David|last=Ramel|date=2020-02-28|website=Visual Studio Magazine|access-date=2023-03-28}}</ref>

==Example code==
<!-- Please don't add any sample code before discussing it on the talk page. -->
The following code snippet displays a message box saying "Hello, World!" as the window loads:
<syntaxhighlight lang="vbscript" highlight="3">
Private Sub Form_Load()
    ' Execute a simple message box that says "Hello, World!"
    MsgBox "Hello, World!"
End Sub
</syntaxhighlight>
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:
<syntaxhighlight lang="vbscript">
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
</syntaxhighlight>

==See also==
{{Portal|Computer programming}}

* {{mono|[[IIf]]}} – a function in several editions of Visual Basic roughly equivalent to the [[?:]] conditional operator of C and related languages.
* [[Comparison of programming languages]]
* [[Control array]]
{{Clear}}

==References==
{{Reflist|30em}}

==External links==
{{Wikiversity|Visual Basic}}
{{Wikibooks|Programming:Visual Basic Classic}}
{{Commons category}}
{{Prone to spam|date=August 2014}}
<!--     {{No more links}}

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If there are already suitable links, propose additions or replacements on
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DMOZ (dmoz.org) and link there using {{Dmoz}}.

-->
*[https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/visual-basic-6.0-documentation Visual Basic 6.0 Resource Center]
*[https://msdn.microsoft.com/en-gb/dd408373.aspx Secure your Visual Basic 6.0 investment with Microsoft .NET]: Migrating from Visual Basic 6.0 to Visual Basic 2008 <!-- dead link http://msdn.microsoft.com/dd408373.aspx  -->
*[https://www.infoq.com/news/2012/02/vb6_supported_on_win8 Visual Basic 6 Renewed to Run on Windows 8]
*[http://blog.danbrust.net/2015/09/14/installing-visual-basic-studio-6-on-windows-10/#.XbQawehKjb0 Instructions for installing Visual Basic 6 on a Windows 10 computer]

{{BASIC|state=open}}
{{MS DevTools|state=collapsed}}
{{GUI builders}}
{{Authority control}}

[[Category:Articles with example BASIC code]]
[[Category:BASIC compilers]] <!-- 5 and above -->
[[Category:BASIC interpreters]] <!-- all P-code runtimes -->
[[Category:Integrated development environments]]
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[[Category:Programming languages created in 1991]]
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