VBScript Reference Manual for InduSoft Web Studio - ICP DAS

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VBScript Reference ManualInduSoft Web StudioAccess of an object’s methods, properties and fields are made by referring to the object,followed by a period, then the particular method, property or field of interest. E.g.Object.MethodObject.PropertyObject.Property.Item• DynamismDynamism relates to the method of allocating computer resources and definition resourcesrequired to run an object-oriented program. There are different types, but VBScript used latebound(late-binding) dynamic typing. This means that the VBScript engine will make the objecttype determination at runtime and allocate sufficient memory at that time. Note that VBScriptand VB.NET are slightly different in their approach to dynamism, and therefore they can declaresome variables and objects in different manners (although many forms of declaration are thesame).• Outlet ConnectionsAt times, Objects will connect together and this connection needs to be defined. With IWS, anexample of a connection would be between a VBScript object (e.g. ADODB) and a DatabaseProvider (a Provider is a front-end to a database). This connection needs to be defined, andthen the connection string (of parameters) between the objects gets defined. When the need forthe connection is finished, the connection should be closed.While a full treatment of object-oriented programming is beyond the scope of these materials, thefundamental concepts of Objects and Classes are important to understand. VBScript supports COMbasedObjects (Component Object Module, a Microsoft standard) such as the ActiveX controls,ADO.NET, FileSystemObject, and Microsoft Office Automation objects. VBScript also supports userdefinedclasses, or Class Objects.VBScript COM objects and VBScript Class objects differ from each other in several important respects.These differences lead to each type of object having its unique strengths:• VBScript classes are more flexible than VBScript COM objects. Class Objects have an abstractsubtype that encapsulates the data you want and the functions you need to work with that data.VBScript COM objects have only basic subtypes (integer or string).• VBScript classes are slightly more efficient than COM objects. The VBScript parser can executethe classes' code directly instead of asking the COM object to execute a method.• COM objects are binary modules. VBScript classes are ASCII files.• You can use any scripting language to write COM objects. You can only use VBScript to writeVBScript classes.• You can use COM objects from within any development environment that supports COMautomation. VBScript classes can only be used within development and runtime environmentsthat support VBScript (e.g IWS and Microsoft Internet Explorer).22 InduSoft, Ltd.
InduSoft Web StudioVBScript Reference ManualVBScript Object CommandsVBScript includes several Functions and Statements that can be used to access objects, including theirmethods and properties. There are a large variety of objects available to VBSript, including userdefinedobjects, intrinsic objects and extrinsic objects.VBScript Object FunctionsFunctionDescriptionCreateObject Creates and returns a reference to an Automation objectGetObject Returns a reference to an Automation object from a fileIsObjectReturns a Boolean value indicating whether an expression references a valid Automationobject.Object StatementsStatementClassExit PropertyFor Each…NextProperty GetProperty LetProperty SetSetDescriptionDeclares the name of a class, as well as a definition of the variables, properties, andmethods that comprise the classForces an exit from inside a Property Set function.Repeats a group of statements for each element in an array or a collection.Declares, in a Class block, the name, arguments, and code that form the body of a Propertyprocedure that gets (returns) the value of a propertyDeclares, in a Class block, the name, arguments, and code that form the body of a Propertyprocedure that assigns (sets) the value of a propertySets a reference to an objectAssigns an object reference to a variable or property, or associates a procedure referencewith an event. Usually used to instantiate an object.Error Handling StatementsStatementDescriptionOn ErrorEnables or disables error-handlingObject & Collection SummaryObjects & Collections DescriptionDebugThe Debug object is an intrinsic global object that can send an output to a scriptdebugger, such as the Microsoft Script Debugger.DictionaryAn associative array that can store any type of data. Data is accessed by a key.DriveAn object that refers to a specific DriveDrivesA collection of Drive objects.ErrContains information about the last run-time error. Accepts the Raise and Clearmethods for generating and clearing run-time errors.FileAn object that refers to a specific FileFilesA collection of File objects.FileSystemObjectAn object model used to access the Windows file systemFolderAn object that refers to a specific FolderFoldersA collection of Folder objects.MatchProvides access to the read-only properties of a regular expression match.MatchesCollection of regular expression Match objects.RegExpProvides simple regular expression support.SubmatchesA collection of regular expression submatch strings.TextStreamAn object that refers to a text FileInduSoft, Ltd. 23
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