VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio The Microsoft Visual Basic Family VBScript is part of a family of Microsoft programming languages that support object-oriented programming. This family of products is derived from the Basic programming language, first developed in 1964. Once study recently indicated that over 50% of all programmers are familiar with VB (Visual Basic) programming. Basic, VB (Visual Basic), VB.NET, VBA and VBScript – The Evolution Most everyone is familiar with Basic, the Beginner’s All-purpose Symbolic Instruction Code that has been around since 1964. Originally designed to teach non-science students about computers, it was one of the first high-level programming languages ported to the PC in the 1980’s. It has continued to evolve with programming and operating system technology. Here is a quick summary of the different versions today: • Basic A simple high-level programming language developed in 1964. Migrated to the PC platform in the 1980’s, with many versions developed. • VB Visual Basic. An event-driven programming version of Basic, supporting graphical user interfaces (GUI), database access and ActiveX controls that was introduced in 1991. VB Version 6 was the last version released (1998). • VB.NET The successor to VB launched in 2002. Supports Microsoft .NET framework architecture and is a true object-oriented programming language. • VBA Visual Basic for Applications is a version of VB (most compatible with Version 6) that is built into Microsoft Office products (Word, Excel, Access, Outlook, PowerPoint) and into some other 3 rd party products. Unlike VB or VB.NET, VBA does not run stand-alone and only runs from a host application, usually within a Microsoft Office application. VBA can control an second application while running in a host application. VBA works on Windows XP/2000/NT platforms only. • VBScript VBScript is considered a dialect of VBA and is the default language for website Active Server Pages (ASP). Like VBA, VBScript does not run stand-alone and only runs from a host application. It is run by the operating system’s Windows Script Host and can be used for Server-side Windows scripting or Client-side Web Page scripting using Microsoft Internet Explorer. A key advantage of VBScript is that it is supported under Windows CE. 8 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual Differences between VBScript and VBA Since other HMI/SCADA products support VBA, it might be worth highlighting some of the key differences between VBScript and VBA. For HMI/SCADA applications, these differences are relatively minor. However, VBScript support for the Windows CE operating system is a major differentiator between the two products. For additional details or a complete listing of the differences, please reference the MSDN website at http://msdn.microsoft.com. Key differences between VBScript vs. VBA Item VBA VBScript Primary Purpose Automation of MS Office Applications Automation of Web Services Support for Windows CE No Yes Data Types Stronger Type Declaration. Many data types supported. (e.g. String, Integer, Date, Boolean) Typeless, uses Variant Type. The final data subtype will be determined at runtime based on use. Supports same data subtypes as VBA and VB (e.g. String, Integer, Date, Boolean, etc) Dimension Statement Dim Var as Type Dim Var (Cannot specify Type, but it is determined at runtime based on use) Class Block declaration Must use separate Class Module Class Block Declaration supported Object Clipboard Collection Not supported Object Manipulation TypeOf Not supported Eval function Not supported Expression evaluation supported Execute function Not supported Allows interpreted code to be executed on the fly. RegExp No Allows creation of regular expressions Error Handling Several different types Supported but more limited Arrays Lower bound can be 0 Lower bound is 0 File I/O Supported Not directly supported but VBScript can use FileSystemObject and can access IWS built-in I/O functions DDE Supported Not supported Financial functions Supported Not supported Strings Fixed length strings Variable length only Debugging Debug, Print, End, Stop Use MsgBox or IWS built-in functions Line labels Supported Not supported InduSoft, Ltd. 9
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VBScript Reference Manual for InduSoft Web Studio

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