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[Public] Event eventname ([<arguments>])
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where <arguments> is
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{[ByVal | ByRef] argumentname [As datatype]},...
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Part 1: Part Title
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Event Statement
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Part 5: Automating an Access Application
Microsoft Office Access 2003 Inside Out
Notes
22
Part 1: Part Title
An Event must be public, which makes the event available to all other procedures in all modules. You can optionally include the Public keyword when coding this statement. You should declare the data type of any arguments in the event s argument list. Note that the names of the variables passed by the triggering procedure can be different from the names of the variables known by this event. If you use the ByVal keyword to declare an argument, Visual Basic passes a copy of the argument to your event. Any change you make to a ByVal argument does not change the original variable in the triggering procedure. If you use the ByRef keyword, Visual Basic passes the actual memory address of the variable, allowing the event to change the variable s value in the triggering procedure. (If the argument passed by the triggering procedure is an expression, Visual Basic treats it as if you had declared it by using ByVal.) Visual Basic always passes arrays by reference (ByRef).
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Example
To declare an event that can be triggered from other modules, enter the following in the class module MyClass:
Option Explicit Public Event Signal(ByVal strMsg As String) Public Sub RaiseSignal(ByVal strText As String) RaiseEvent Signal(strText) End Sub
To respond to the event from another module, enter the following:
Option Explicit Dim WithEvents objOtherClass As MyClass Sub LoadClass () Set objOtherClass = New MyClass End Sub Sub objOtherClass_Signal(ByVal strMsg As string) MsgBox "MyClass Signal event sent this " & _ "message: " & strMsg End Sub
To trigger the event in any other module, execute the following:
MyClass.RaiseSignal "Hello"
Private Statement
Use a Private statement in the Declarations section of a standard module or a class module to declare variables that you can use in any procedure within the module. Procedures in other modules cannot reference theses variables. 784
Part 5: Automating an Access Application
Understanding Visual Basic Fundamentals
Syntax
Private {[WithEvents] variablename [([<array dimension>],... )] [As [New] datatype]},...
where <array dimension> is
[lowerbound To ] upperbound
Notes
If you do not include an <array dimension> specification but you do include the parentheses, you must include a ReDim statement in each procedure that uses the array to dynamically allocate the array at run time. You can define an array with up to 60 dimensions. If you do not include a lowerbound value in an <array dimension> specification, the default lower bound is 0. You can reset the default lower bound to 1 by including an Option Base 1 statement in the module Declarations section. The lowerbound and upperbound values must be integers, and upperbound must be greater than or equal to lowerbound. The number of members of an array is limited only by the amount of memory on your machine. Valid datatype entries are Byte, Boolean, Integer, Long, Currency, Single, Double, Date, String (for variable-length strings), String * length (for fixed-length strings), Object, Variant, or one of the object types described earlier in this chapter. You can also declare a user-defined variable structure using the Type statement and then use the user type name as a data type. You should always explicitly declare the data type of your variables. If you do not include the As datatype clause, Visual Basic assigns the Variant data type. Use the New keyword to indicate that a declared object variable is a new instance of an object that doesn t have to be set before you use it. You can use the New keyword only with object variables to create a new instance of that class of object without requiring a Set statement. You can t use New to declare dependent objects. If you do not use the New keyword, you cannot reference the object or any of its properties or methods until you set the variable to an object using a Set statement. Use the WithEvents keyword to indicate an object variable within a class module that responds to events triggered by an ActiveX object. Form and report modules that respond to events on the related form and report objects are class modules. You can also define custom class modules to create custom objects. If you use the WithEvents keyword, you cannot use the New keyword. Visual Basic initializes declared variables at compile time. Numeric variables are initialized to zero (0), variant variables are initialized to empty, variable-length string variables are initialized as zero-length strings, and fixed-length string variables are filled with ANSI zeros (Chr(0)).
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