VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio VBScript with Web Thin Clients In a Web Thin Client environment, the browser serves as the host for both HTML web pages published by the IWS Server, as well as the host for VBScript code segments that are associated with a particular Screen or object on the Screen. Generally, Microsoft Internet Explorer serves as the browser in a Web Thin Client environment. A InduSoft ActiveX Control (ISSymbol) is used to coordinate communications between the IWS Server and a Web Thin Client. In a Windows XP/2000/NT-based Web Thin Client environment, Microsoft Internet Explorer (e.g. Version 6 or later) supports VBScripts and ActiveX by default. In a Windows CE-based Web Thin Client environment, Microsoft Internet Explorer (typically provided with PocketPC products) supports both VBScript and ActiveX, but VBScript support must be enabled in the Windows CE image (part of the Platform Build process, typically done by the hardware supplier). Windows CE systems with Microsoft Pocket Explorer (different that Microsoft Internet Explorer) will not work with VBScript as Pocket Explorer does not support VBScript due to memory limitations. Also remember that any ActiveX controls used on a Windows CE Web Thin Client must be developed to support Windows CE. VBScript Interface Functioning related to a Web Thin Client Global Procedures VBScript Global Procedures are accessible to VBScript code segments that execute on a Web Thin Client Graphics Module Operates on IWS Server PC only. Procedures and Variables not accessible to a Web Thin Client. This VBScript interface (for a Web Page) executes independently from the VBScript Interface for a Screen running on the IWS Server. • The Graphics_OnStart() subroutine starts when the Web Thin Client Station is successfully logged in and ISSymbol is hosted on the Web Screen Scripts • Browser The Graphics_WhileRunning() subroutine executes on the Web Thin Client while the Web Thin Client remains logged in and the ISSymbol Control remain hosted on the Web Browser • The Graphics_OnEnd() subroutine is executed once the Web Thin Client logs off or the ISSymbol Control is no longer hosted by the Web Browser Command Dynamic This VBScript interface (for a Web Page) executes independently from the VBScript Interface for a Screen running on the IWS Server. ActiveX Event Handler This VBScript interface (for a Web Page) executes independently from the VBScript Interface for a Screen running on the IWS Server. Background Task Startup Operates on IWS Server PC only. Procedures and Variables not accessible to a Web Thin Client. Background Task Scripts Operates on IWS Server PC only. Procedures and Variables not accessible to a Web Thin Client. Key Notes: • Under Windows XP/2000/NT, to check or modify Internet Explorer’s settings for support of VBScript and ActiveX Controls, open Internet Explorer, then click on Tools -> Internet Options -> Security -> Custom Level. • All VBScript interfaces unique to the Web Thin Client continue to have access to IWS tags and IWS built-in functions. • When using a Windows CE device for the Web Thin Client, be sure ActiveX support and VBScript support is enabled. This is a function of the Windows CE OS image built using Microsoft Platform Builder. • When using a Windows CE device for the Web Thin Client, verify that MsgBox and InputBox functions are enabled in the Windows CE OS image if you intent to use them, 62 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual VBScript Language Reference This Language Reference section is intended to cover VBScript as it is intended to be used with InduSoft Web Studio (IWS) and CEView. VBScript, or more properly Microsoft Visual Basic Scripting Edition, is one of the members of the Microsoft Visual Basic family. VBScript is primarily a subset of VBA, or Visual Basic for Applications, although VBA and VBScript are targeted at different applications. VBA was intended to be used for the automation of Microsoft Office and Microsoft Project applications, while VBScript was designed for use with Web-based applications, both on the client side (e.g. Microsoft Internet Explorer) where it compliments Jscript, and on the Server side, where it works with ASP (Active Server Pages) applications and WSH (Windows Script Host) scripts. InduSoft provides a VBScript Hosting environment for the InduSoft Web Studio (IWS) and CEView HMI/SCADA software, allowing developers to use both VBScript programmability and native IWS (and CEView) configurability. This combination of development methodologies lets developers chose which development methodology best suits their application requirements. InduSoft has chosen to implement VBScript instead of VBA, since VBScript has a number of advantages not inherent in VBA, including the support for thin clients and Windows CE runtime environments. This VBScript Language Reference covers the following material: • Variables (Type, Declaration, Scope) • Constants (Explicit, Implicit) • Keywords • Errors (Runtime, Syntax) • Operators (Type, Precedence) • Functions and Procedures • Statements • Objects and Collections • VBScript restrictions within the IWS development environment • Example VBScript Applications InduSoft, Ltd. 63
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