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Modeling using VBA. Using Toolbox. Using the Toolbox select a GUI element and by mouse-click place it on the frame. This is a label. This is a text box. This is a button. Using User Form Work with Common Button, Text Box. Using User Form Work with Common Button, Text Box. - PowerPoint PPT Presentation
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Modeling using VBA
Using Toolbox
This is a label
This is a button
Using the Toolbox select a GUI element and by mouse-click place it on the frame This is a text box
Using User Form Work with Common Button, Text Box
Using User Form Work with Common Button, Text Box
Working with Combo Box
Working with List Box
Working with Image Control, Spin Button
Work with Multipage, Option controls
Work with Scroll Bar, Check Box, Frame controls
Work with additional controls
Modules & Procedures
• Module – collection of logically related procedures & functions grouped together
• Procedure – a group of ordered statements enclosed by Sub and End Sub
• Function – the same as a procedure, but also returns some value and is enclosed between Function and End Function key words
Procedure & Function Examples
Sub ShowTime() Range("C1") = Now()
End Sub
Function sumNo(x, y) sumNo = x + y
End FunctionFunction: returns something
Procedure: doesn’ t returns anything
Calling procedures vs. calling functions
Sub z(a) MsgBox a
End Sub
Sub x() Call z("ABC")
End Sub
Sub y() z "ABC“
End Sub
Sub ShowSum()varSum= Module1.sumNo(3,5)
MsgBox varSumEnd Sub
Function sumNo(x, y) sumNo = x + y
End Function
If there are several sumNo functions in several modules/forms, need to use the full name of the function
Passing Arguments by Value or by Reference
• Passing arguments by reference – – Is the VBA default– Means, if any changes happened to the argument
variables, they will be preserved after the function/procedure finishes
• Passing arguments by value –– Is possible in VBA (by explicit definition)– Means, the pre-calling state of the argument variables will
be preserved after the procedure/function finishes
Arguments by Ref/by Val. Examples
Sub TestPassing1() Dim y As Integer y = 50 AddNo1 y MsgBox y AddNo2 y MsgBox y
End Sub
Sub AddNo1(ByRef x As Integer) x = x + 10
End Sub
Sub AddNo2(x As Integer)x = x + 10
End Sub
public Sub TestPassing2() Dim y As Integer y = 50 AddNo3 y MsgBox y
End Sub
private Sub AddNo3(ByVal x _ As Integer) x = x + 10
End Sub
Functions/Procedure Scope
• Use public to allow any module to call the function/procedure
• Use private to make limited access to the function/procedure (only from the owning module)
VBA Variables
• A variable is used to store temporary information within a Procedure, Function, Module…
• A variable name– Must start with letter and can’t contain spaces and special
characters (such as “&”, “%”, “\”) – Can’t be any excel keyword (“if”, “while”…)– Can’t have identical name to any existing class
(“Worksheet”, “Workbook”…)
VBA Data Type
• Byte – positive integer numbers (0:255)• Integer – integers (-32,768 : 32,767)• Long – 4-byte integer• Currency – for fixed-point calculations• Single – 2-byte floating-point numbers• Double – double-precision floating-point numbers• Date – used to store dates and times as real
numbers.• String – contains a sequence of characters
Using Variables
• Declaring Variables– Format: Dim varibleName AS dataType– Examples:
• Dim myText As String • Dim myNum As Integer• Dim myObj As Range
– The default value of • any numeric variable is zero• any string variable – “” (empty string)• an Object variable – is nothing