VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio Debug NOTE: the Debug object is not currently compatible with IWS. The Debug object is documented for consistency purposes only. Function The Debug object is an intrinsic global object that can send an output to a script debugger, such as the Microsoft Script Debugger. Remarks The Debug object cannot be created directly, but it is always available for use. The Write and WriteLine methods of the Debug object display strings in the Immediate window of the Microsoft Script Debugger at run time. If the script is not being debugged, the methods have no effect. 2 Method Write Description Sends strings to the script debugger Usage Debug.Write ([str1 [,str2 [, …[, strN]]]] Arguments str1...strN Optional. Strings to send to the script debugger Remarks The Write method sends strings to the Immediate window of the Microsoft Script Debugger at run time. If the script is not being debugged, the Write method has no effect. The Write method is almost identical to the WriteLine method. The only difference is that the WriteLine method sends a newline character after the strings are sent. Example Dim counter Counter = 30 Debug.Write “The value of counter is “ & counter Method WriteLine Description Sends strings to the script debugger, followed by the newline character Usage Debug.WriteLine ([str1 [,str2 [, …[, strN]]]] Arguments str1...strN Optional. Strings to send to the script debugger Remarks The WriteLine method sends strings to the Immediate window of the Microsoft Script Debugger at run time. If the script is not being debugged, the WriteLine method has no effect. The WriteLine method is almost identical to the Write method. The only difference is that the Write method does not send a newline character after the strings are sent. Example Dim counter Counter = 30 Debug.Write “The value of counter is “ & counter Err Function Contains information about the last run-time error. Accepts the Raise and Clear methods for generating and clearing run-time errors. Usage val = Err.Property Err.Method Arguments Varies with properties and methods used (see below) Remarks The Err object is an intrinsic object with global scope — there is no need to create an instance of it in your code. The properties of the Err object are set by the generator of an error — VBScript, an Automation object, or the VBScript programmer. The default property of the Err object is Number. Err.Number contains an integer and can be used by an Automation object to return an SCODE. When a run-time error occurs, the properties of the Err object are filled with information that uniquely identifies the error and information that can be used to handle it. To generate a run-time error in your code, use the Raise method. 2 See http://msdn.microsoft.com for additional information on the Microsoft Script Debugger 198 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual The Err object's properties are reset to zero or zero-length strings ("") after an On Error Resume Next statement. The Clear method can be used to explicitly reset Err. For more information, see Microsoft Web site. 3 Property Description Function: Returns or sets a descriptive string associated with an error. Usage: Err.Description [= stringexpression] Arguments stringexpression A string expression containing a description of the error. Remarks: The Description property consists of a short description of the error. Use this property to alert the user to an error that you can't or don't want to handle. When generating a user-defined error, assign a short description of your error to this property. If Description isn't filled in, and the value of Number corresponds to a VBScript run-time error, the descriptive string associated with the error is returned Example: On Error Resume Next Error.Raise 39 ‘This is a non-defined VBScript error Err.Description =”Pump OverFlow” ‘Define the error message MsgBox “Error type is “ & Err.Description Property HelpContext Function: Sets or returns a context ID for a topic in a Help File. Usage: Err.HelpContext [= contextID] Arguments contextID Optional. A valid identifier for a Help topic within the Help file. Remarks: If a Help file is specified in HelpFile, the HelpContext property is used to automatically display the Help topic identified. If both HelpFile and HelpContext are empty, the value of the Number property is checked. If it corresponds to a VBScript run-time error value, then the VBScript Help context ID for the error is used. If the Number property doesn't correspond to a VBScript error, the contents screen for the VBScript Help file is displayed. Example: On Error Resume Next Const usercontextID = 10 Error.Raise 48 ‘Error Loading DLL Err.HelpFile = “myDLL.hlp” ‘The help file Err.HelpContext = usercontextID ‘Specify the user context ID If Err.Number 0 Then MsgBox “Press F1 for help ” & “Error:” & Error.Description &_ Err.Helpfile & Err.HelpContext End If 3 http://www.microsoft.com/technet/scriptcenter/resources/scriptshop/shop1205.mspx http://www.microsoft.com/technet/scriptcenter/resources/scriptshop/shop0106.mspx InduSoft, Ltd. 199
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VBScript Reference Manual for InduSoft Web Studio

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