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Part 1: Part Title
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Part 5: Automating an Access Application
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Microsoft Office Access 2003 Inside Out optional parameters. Use the IsMissing built-in function to test for the absence of optional parameters. You can also use the ParamArray argument to declare an array of optional elements of the Variant data type. When you attempt to assign a value to this property in an object set to the class, you can then pass it an arbitrary number of arguments. The ParamArray argument must be the last argument in the argument list. You must always declare at least one parameter, object, that is the variable to contain the object that the calling code wants to assign to your property. This is the object reference that appears on the right side of the assignment statement executed in the calling code. If you include an objecttype entry, it must match the object type declared by the companion Property Get procedure. Also, when you declare an object type, the caller receives a data type mismatch error if the assignment statement attempts to pass an incorrect object type. You can evaluate the properties of this object, set its properties, execute its methods, and save the object pointer in another variable that your Property Get procedure can later return. Use the Exit Property statement anywhere in your property procedure to clear any error conditions and exit your procedure normally, returning to the calling procedure. If Visual Basic runs your code until it encounters the End Property statement, control is passed to the calling procedure but any errors are not cleared. If this procedure causes an error and terminates with the End Property statement, Visual Basic passes the error to the calling procedure. See Trapping Errors on page 834 for details.
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Part 1: Part Title
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Examples
To declare a ControlToUpdate property, accept a value from a caller, and save the value in an object variable defined in the Declarations section of your class module, enter the following:
Option Explicit Dim ctlToUpdate As Control Property Set ControlToUpdate(ctl As Control) ' Verify we have the right type of control Select Case ctl.ControlType ' Text box, combo box, and list box are OK Case acTextBox, acListBox, acComboBox ' Save the control object Set ctlToUpdate = ctl Case Else Err.Raise 3999 End Select End Property
To establish a new instance of the object defined by the ComDlg class module and then set its Filename property, enter the following in a function or sub:
Dim clsDialog As New ComDlg, strFile As String With clsDialog ' Set the title of the dialog .DialogTitle = "Locate LawTrack Contacts Data File" ' Set the default file name .FileName = "ContactsData.mdb" End With
Part 5: Automating an Access Application
Understanding Visual Basic Fundamentals
Visual Basic provides many ways for you to control the flow of statements in procedures. You can call other procedures, loop through a set of statements either a calculated number of times or based on a condition, or test values and conditionally execute sets of statements based on the result of the condition test. You can also go directly to a set of statements or exit a procedure at any time. The following sections demonstrate some (but not all) of the ways you can control flow in your procedures.
Call Statement
Use a Call statement to transfer control to a subroutine.
Syntax
Call subroutinename [(<arguments>)]
subroutinename [<arguments>]
where <arguments> is
{[ByVal | ByRef] <expression> },...
The Call keyword is optional, but if you omit it, you must also omit the parentheses surrounding the parameter list. If the subroutine accepts arguments, the names of the variables passed by the calling procedure can be different from the names of the variables as known by the subroutine. You can use the ByVal and ByRef keywords in a Call statement only when you re making a call to a dynamic link library (DLL) procedure. Use ByVal for string arguments to indicate that you need to pass a pointer to the string rather than pass the string directly. Use ByRef for nonstring arguments to pass the value directly. If you use the ByVal keyword to declare an argument, Visual Basic passes a copy of the argument to the subroutine. The subroutine cannot change the original variable in the calling procedure. If you use the ByRef keyword, Visual Basic passes the actual memory address of the variable, allowing the procedure to change the variable s value in the calling procedure. (If the argument passed by the calling procedure is an expression, Visual Basic treats it as if you had declared it by using ByVal.)
To call a subroutine named MySub and pass it an integer variable and an expression, enter the following:
Call MySub (intMyInteger, curPrice * intQty)
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