LotusScript for Visual Basic Programmers - IBM Redbooks

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developer). The objects also contain code, which is used to manipulate or inspect this data at run time. A very simple example might be to create a class to display a message. We’ll do this in LotusScript by creating a class called DisplayMsg. In the following listing, the DisplayMsg class is shown, where you will see a property called Text and a method called Display. Class DisplayMsg ' Declare member variables in a LotusScript class mMsg As String mMsgNumber As Integer Public Property Set Text As String mMsg = Text End Property Public Sub Display Msgbox(mMsg) End Sub End Class The text for the class is entered into the declarations of a Notes form. The code in the next listing is entered into the Sub Click event of a button on this Notes form. Here you will see a variable created as a variant called objMsg, which will be used to hold the instance of our message object. The set objMsg = New DisplayMsg line actually creates the instance of the object and loads a reference of it into the objMsg variable. Sub Click (Source As Button) Dim objMsg as Variant Set objMsg = New DisplayMsg objMsg.Text = "(" & Format$(68) & ") - " & Error$(68) objMsg.Display Delete objMsg End Sub 20 LotusScript for Visual Basic Programmers
Once you have created the object, you can set the text property by referring to it as object.property, or objMsg.Text in this case. You can cause the code in the Display method (function) to execute using the same process. While this is a simple example, you might easily imagine additional possibilities here. The message may actually be “displayed” on a pager, or logged to a database, all by adding more code to this basic structure. The mechanism to create the object, load its properties and call its methods remains the same. LotusScript will allow you to use most of the most important OO constructs, like: Building classes, Private and Public data within objects and instantiating an object (stored outside your application) from within a running application. LotusScript also supports single inheritance. LotusScript Notes classes support inheritance with the ability to create classes and then subclasses of objects. Note that the embedding product (in this case, Notes) exposes the products’ functionality as a set of classes. It is these “product classes” that can be inherited into your own private classes. Visual Basic supports all of the object-oriented features above, with the exception of inheritance. Visual Basic Class Modules Visual Basic classes are handled through a new “class” of code module, a .CLS file. The CLS file is called a Class file. Class files behave like .BAS code modules in structure. The code within the class is used by creating an object at run time and then referring to the object’s methods and properties. Special code is executed when you create an instance of the object. Similar code is executed when you delete the object. Visual Basic classes have a Class object, which holds Class_Initialize and Class_Termination events. Whenever you create a new object, the initialization event is executed. When you delete an object, either by leaving the scope where the object was created or explicitly by saying Set objRef = Nothing, the termination event is executed. LotusScript Notes Classes Classes within LotusScript are added inline, directly within the code modules themselves. Like Visual Basic, LotusScript provides initialization and termination procedures within the classes; in this case, called Sub Delete and Sub New and Sub Delete. Like Visual Basic, code within these procedures is executed automatically. Sub New is executed whenever you create an object from the class. Sub Delete is executed whenever you destroy the object using the Lotus Delete object statement. Chapter 1: LotusScript and Visual Basic: A Comparison 21
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 and 24: MessageBox Visual Basic developers
Page 25 and 26: Extending the Code Visual Basic pro
Page 27 and 28: Lotus Components You can add Window
Page 29: Lotus, creating a cut-down version
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
Page 75 and 76: NotesInternational The NotesInterna
Page 77 and 78: NotesLog Property Description IsNam
Page 79 and 80: 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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