Visual Objects is an object-oriented computer programming language that is used to create software programs that operate primarily under Windows. Although it can be used as a general-purpose programming tool, it is almost exclusively used to create database programs.
The original Visual Objects project (code-named Aspen) was started as part of Nantucket's attempts to bring the Clipper language to Windows, and move from the procedural to the object-oriented style. It also converted Clipper from a p-code system to being a true native compiler and introduced more elements of the C language (such as typed variables), while including Windows extensions (such as COM, ODBC, and later ADO). With its symbol datatype, it offers the ability to form name-based linkages, which may be used to connect menu events to object methods or form direct linkages between server columns and controls.
The Windows version was finally brought to market by Computer Associates. Unfortunately it was released before it was market-ready and in almost head-to-head competition with the first release of Borland's Delphi product. The language is still in use however the last release by GrafX Software was in Februari 2011 (VO 2.8 SP4). The next incarnation of the Visual Objects language is Vulcan.NET 3.0, launched in August 2013, written by GrafX from scratch to be both Visual Objects compatible and be a true CLS compliant .NET language, taking full advantage of the .NET framework.
xBase is the generic term for all programming languages that derive from the original dBASE (Ashton-Tate) programming language and database formats. These are sometimes informally known as dBASE "clones". While there was a non-commercial predecessor to the Ashton-Tate product (Vulcan written by Wayne Ratliff), most clones are based on Ashton-Tate's 1986 dBASE III+ release/scripts written in the dBASE III+ dialect are most likely to run on all the clones.
Clipper is a computer programming language that is used to create software programs that originally operated primarily under DOS. Although it is a powerful general-purpose programming language, it was primarily used to create database/business programs.
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De originele website van Visual Object - www.cavo.com
De ontwikkelaar van CA Visual Object, www.grafxsoft.com, verdeelt ook software en 3th party bibliotheken en tools voor Visual Objects en Clipper. Bijkomend is er software te vinden voor Vulcan.NET en Microsoft development tools.
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