LotusScript for Visual Basic Programmers - IBM Redbooks

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the chance to deal with it by adding an error handler. If the developer does not add the error handler, the application will then display the system error message and most likely terminate the application. Visual Basic represents the Device Unavailable error with an internal number 68. LotusScript also represents this error with the internal number 68. Most of the system-oriented errors that are trappable errors in Visual Basic can be handled by LotusScript as well, using the same numbers. LotusScript provides an ASCII file LSERR.LSS, that defines the system errors it allows you to trap. Visual Basic provides a list of system, Access and OLE errors that it allows you to trap on as part of its online documentation. There is a general guideline to how the trappable errors are grouped. The Visual Basic error groupings are: 1-94 System Errors 260-428 DDE or Form Errors 429-451 OLE Automation Errors 444-521 System Errors 2400-3622 Data Access Errors 4000- Notes Container Errors 31000- 31050 OLE Container Errors Lotus maps a number of the trappable errors for you into constants declared in the LSERR.LSS file. A snippet of the errors defined within this file are shown in the following listing: ' Run Time LOI Errors Public Const ErrFileAlreadyExists = 58 Public Const ErrBadRecordLength = 59 Public Const ErrDiskFull = 61 Public Const ErrInputPastEndOfFile = 62 Public Const ErrBadRecordNumber = 63 Public Const ErrBadFileName = 64 Public Const ErrTooManyFiles = 67 Public Const ErrDeviceUnavailable = 68 14 LotusScript for Visual Basic Programmers
Extending the Code Visual Basic provides the ability to Raise an error for an object, which allows you to handle the error through external applications or OLE servers. The code for this looks like this: object.Raise(Number, Source, Description, HelpFile, HelpContext) and works in a similar fashion to using the Error errNumber statement within Basic code. The system believes that the error has occurred once you issue the Error statement or .Raise method for an object, with all expected error traps enabled as well. Note that you can generate your own application-level errors in both Visual Basic and LotusScript, by using the Error statement with an unused error number. For example, if you have an appropriate On Error Goto trap in a section of code, the statement ERROR 147 will generate a user-defined error in both languages. In Visual Basic you’ll receive the error string “Application-Defined or Object-Defined Error”. In LotusScript the error message generated would be “User-defined error”. This allows you to define errors that can be handled the same way, sharing the user-defined error numbers across multiple applications. Anyone developing complex applications knows that you will need more than just the BASIC language syntax itself, in order to add complex or custom processing to your program. Usually this means accessing the underlying environment’s API calls, accessing external data engines or using the many custom controls available from third-party companies. Application Programming Interface Calls Using API calls allows you to extend your programming reach into the system-oriented functions, available in the underlying operating systems. Note that once you code an API call in a language like LotusScript or Visual Basic, you have added complexity as well as reliance on the presence of the underlying service. LotusScript and Visual Basic differ on how APIs are enabled in the respective languages. 32-bit issues An example of this can again be found in the WriteProfileString API call. In Windows 3.1x, this API call places a string into the WIN.INI ASCII parameter file. GetProfileString can be later used to retrieve the string. Chapter 1: LotusScript and Visual Basic: A Comparison 15
Page 1 and 2: LotusScript for Visual Basic Progra
Page 3 and 4: Abstract This redbook describes how
Page 5 and 6: NotesTimer ................... ....
Page 7 and 8: Preface This redbook describes how
Page 9 and 10: Chapter 12, “Using Notes as an OL
Page 11 and 12: Chapter 1 LotusScript and Visual Ba
Page 13 and 14: Object-Oriented Terminology LotusSc
Page 15 and 16: There are many good examples of how
Page 17 and 18: LotusScript only allows arrays and
Page 19 and 20: File I/O Code such as the following
Page 21 and 22: "frmMain::cmdUpdateDB_Click") then
Page 23: MessageBox Visual Basic developers
Page 27 and 28: Lotus Components You can add Window
Page 29 and 30: Lotus, creating a cut-down version
Page 31 and 32: Once you have created the object, y
Page 33 and 34: Public Function PostError(ErrNumber
Page 35 and 36: 1. Consts move out of the class int
Page 37 and 38: In Visual Basic sending a message i
Page 39 and 40: Where LotusScript commands and synt
Page 41 and 42: Chapter 2 The Notes Integrated Deve
Page 43 and 44: Action Pane This is the narrow wind
Page 45 and 46: Run Area The three radio buttons sp
Page 47 and 48: 4. Click the Methods twistie, and a
Page 49 and 50: When you enter structured programmi
Page 51 and 52: ut the results are different. Such
Page 53 and 54: Before we let the code run to the b
Page 55 and 56: The following figure shows the hier
Page 57 and 58: NotesACL Every NotesDatabase contai
Page 59 and 60: NotesAgent NotesAgent is contained
Page 61 and 62: Method Description New Creates a ne
Page 63 and 64: Method Description UnprocessedSearc
Page 65 and 66: NotesDateTime NotesDateTime is cont
Page 67 and 68: Property Description Name Read-only
Page 69 and 70: Method Description Save Saves any c
Page 71 and 72: Property Description UniversalID Re
Page 73 and 74: NotesEmbeddedObject The NotesEmbedd
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NotesInternational The NotesInterna
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NotesLog Property Description IsNam
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NotesName The NotesName class will
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NotesRichTextItem NotesRichTextItem
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Method Description CreateNewsletter
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NotesTimer The NotesTimer class wil
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Method Description GetPrevSibling G
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NotesUIWorkspace NotesUIWorkspace c
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Method Description FindFreeTimeDial
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NotesUIDatabase The NotesUIDatabase
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The following figure shows how it w
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Dim doc As Object We create a refer
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Declaring Notes Classes in Visual B
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In Visual Basic, we can access the
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Dim doc As Object Dim item As Objec
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The following figure shows a Visual
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Chapter 5 Converting HiTest Applica
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We declare an hgstatus variable. Al
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Converting a HiTest Application Usi
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2. Put the following code on the Cr
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Converting a HiTest Application to
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6. Enter the following code on the
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10. From the Notes menu, choose Fil
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Accessing Notes Session Properties
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Example This example sets the value
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HiTest Functions Notes Class method
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Accessing Notes Sessions in LotusSc
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Chapter 7 Accessing Notes Databases
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We set the property of hgdatabase.
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HiTest Name LotusScript Notes Class
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All of the methods mentioned above
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REM view becomes a NotesView object
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We create a new database on a local
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Dim hgviewid As Long Dim hgview As
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Following is an explanation of the
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We declare a session, db and view w
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The HiTest Visual Basic API does no
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Chapter 9 Accessing Notes Documents
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We create and open a new document u
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HiTest Function Name Notes Classes
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Set doc = dc.GetFirstDocument(1247)
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NotesUIDocument = EditDocument([boo
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Set dc = db.AllDocuments Set doc =
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We enter text in the Subject, Categ
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Attachments Internally, Lotus Notes
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hgstatus = HTDocumentClose(hgdest_d
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Windows 3.1. For details on the OLE
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Dim db As NotesDatabase Dim view As
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Perform the following steps to crea
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Tip You can select Display as icon
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Creating a Linked Object 3. Choose
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Creating an Embedded Object Using L
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Messagebox msg$, boxType, "Successf
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Embedding a New Object in a Documen
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Note If you do not want to create t
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answer% = Messagebox ("Object has b
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16. Click Yes to confirm that you w
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7. Select the Show twistie when row
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Editing a Linked Object Note If you
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Editing an Embedded or a Linked Obj
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The object’s application is launc
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Following is a description of the L
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(10) Select Case object.Type Case E
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This statement assigns object as a
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HiTest Class Agent Attachment CDRec
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HiTest Class Datetime Document HiTe
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HiTest Class Item HiTest Functions
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HiTest Class User View Viewcell HiT
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other operating environments may va
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How To Get ITSO Redbooks This secti
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How Customers Can Get ITSO Redbooks
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H handling errors, 95 hierarchical
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