VBScript Reference Manual for InduSoft Web Studio

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
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