Financial Information Management VB, VBA, VS, VSTO & VBE: Putting it all together Source: Excel VBA Programming by John Walkenbach

Visual Basic For Applications  VBA = VB + Objects (e.g., buttons, cells, charts…)  Objects can contain other objects  Object model (‘Application’ on top)  If plural, then it is a collection of similar objects Application.Workbooks("Book1.xlsx").Worksheets("Shee t1").Range("A1")  Objects can contain variables (‘properties’) Application.Workbooks("Book1.xlsx").Worksheets("Shee t1").Range("A1").Value

Syntax  Objects can contain procedures (‘methods’) Application.Workbooks("Book1.xlsx") _.Worksheets("Sheet1").Range("A1").Clear()  If you omit the top hierarchy, excel uses the active object Range("A1").Value.ToString()

Classes and Modules  Specific objects are called instances (e.g., “Button1”)’  The code that generates objects is called a class (e.g., the Class Button ).  A module is just a file that contains code.  Objects (not modules) need to be instantiated with the command New

Equivalent Styles: ActiveWorkbook.Worksheets("Sheet1").Sort _.SortFields.Add Key:=Range("K2:K6"), _ SortOn:=xlSortOnValues, _ Order:=xlDescending, _ DataOption:=xlSortNormal ActiveWorkbook.Worksheets("Sheet1").Sort _.SortFields.Add Range("K2:K6"), _ xlSortOnValues, xlDescending, xlSortNormal

Importing a program built with VS/VSTO  Copy, paste, and adapt  Fincal Example

FinCal (from H3) Private Sub FinCalBtn_Click(sender As Object, e As EventArgs) Handles FinCalBtn.Click Dim inputFromUser As String = "" Dim interestRate As Double = 0 Dim principal As Double = 0 Dim numberOfYears As Double = 0 Dim interest As Double = 0 Dim sum As Double = 0 Do Range("A1:B2").Clear() Do inputFromUser = InputBox("Hello! Please enter an interest rate (e.g., 4.750)", "User input window", "0") interestRate = Double.Parse(inputFromUser) Loop While (interestRate 10) interestRate = interestRate / 100 Do inputFromUser = InputBox("Please enter a principal (e.g., no $)", "User input window", "0") principal = Double.Parse(inputFromUser) Loop While (principal <= 0) Do inputFromUser = InputBox("Please enter the time in years (e.g.,7)", "User input window", "0") numberOfYears = Double.Parse(inputFromUser) Loop While (numberOfYears 30) inputFromUser = InputBox("Would you like to see: (a) the interest, (b) the sum of principal + interest, or (c) both a and b (default)", "User input window", "c") interest = principal * ((1 + interestRate) ^ numberOfYears - 1) sum = principal + interest Select Case inputFromUser Case "a" Range("A1").Value = interest.ToString("C2") Range("A1").ColumnWidth = 15 Range("B1").Value = "is the interest that you requested" Case "b" Range("A1").Value = sum.ToString("C2") Range("A1").ColumnWidth = 15 Range("B1").Value = "is the sum of interest and principal" Case Else Range("A1").Value = interest.ToString("C2") Range("A1").ColumnWidth = 15 Range("B1").Value = "is the interest that you requested" Range("A2").Value = sum.ToString("C2") Range("B2").Value = "is the sum of interest and principal" End Select inputFromUser = InputBox("Want to compute more? (y/n)", "User Input Window", "n") Loop While inputFromUser = "y" End Sub

FinCal (for VBA) Private Sub FinCal() Dim inputFromUser As String Dim interestRate As Double Dim principal As Double Dim numberOfYears As Double Dim interest As Double Dim sum As Double Do Range("A1:B2").Clear Do inputFromUser = InputBox("Hello! Please enter an interest rate (e.g., 4.750)", _ "User input window", "0") interestRate = inputFromUser Loop While (interestRate 10) interestRate = interestRate / 100 Do inputFromUser = InputBox("Please enter a principal (e.g., no $)", "User input window", "0") principal = inputFromUser Loop While (principal <= 0) Do inputFromUser = InputBox("Please enter the time in years (e.g.,7)", "User input window", "0") numberOfYears = inputFromUser Loop While (numberOfYears 30) inputFromUser = InputBox("Would you like to see: (a) the interest, (b) the sum of principal + interest, or (c) both a and b (default)", _ "User input window", "c") interest = principal * ((1 + interestRate) ^ numberOfYears - 1) sum = principal + interest Select Case inputFromUser Case "a" Range("A1").Value = interest Range("A1").ColumnWidth = 15 Range("B1").Value = "is the interest that you requested" Case "b" Range("A1").Value = sum Range("A1").ColumnWidth = 15 Range("B1").Value = "is the sum of interest and principal" Case Else Range("A1").Value = interest Range("A1").ColumnWidth = 15 Range("B1").Value = "is the interest that you requested" Range("A2").Value = sum Range("B2").Value = "is the sum of interest and principal" End Select inputFromUser = InputBox("Want to compute more? (y/n)", "User Input Window", "n") Loop While inputFromUser = "y" End Sub

A function: CalcDelta Function CalcDelta(sigma As Double, K As Double, S As Double, currDate As Date, expDate As Date, r As Double, optionType As String) As Double Dim d1 As Double Dim t As Double t = (expDate - currDate) / d1 = (Log(S / K) + (r + sigma * sigma / 2) * t) / (sigma * t ^ (1 / 2)) If optionType = "Call" Then CalcDelta = Application.WorksheetFunction.Norm_S_Dist(d1, True) Exit Function End If If optionType = "Put" Then CalcDelta = (Application.WorksheetFunction.Norm_S_Dist(d1, True) - 1) Exit Function End If MsgBox "Option type not recognized" CalcDelta = 0 End Function

Recording a macro  Use the recorder to Download a Table from Alpha (can only do that from lab machines or on VPN)  Examine the code  Run the macro

Recording a macro with SQL  Use the recorder to execute some SQL (can only do that from lab machines or on VPN)  Examine the code and modify it  Run the macro Note: delete commandtype = 0

The recorder  Good for simple subs, but significant limitations (next)  Use it to find out commands  Example: highlight a cell and change the name of a worksheet

Limitations of the recorder  Cannot create loops  Cannot create If-Then statements  Cannot display pop-up messages or custom dialog boxes  Cannot create functions  Often produces overcomplex code

Bonus: Conway’s game of life Sub Life() Dim lifeField As Range Set lifeField = Application.Worksheets("Sheet1").Range("B2:AL40") For i = 1 To 60 Range("A1") = i For Each c In lifeField counter = 0 If c.Offset(-1, -1).Interior.Color = vbRed Then counter = counter + 1 End If If c.Offset(-1, 0).Interior.Color = vbRed Then counter = counter + 1 End If If c.Offset(-1, 1).Interior.Color = vbRed Then counter = counter + 1 End If If c.Offset(0, -1).Interior.Color = vbRed Then counter = counter + 1 End If If c.Offset(0, 1).Interior.Color = vbRed Then counter = counter + 1 End If If c.Offset(1, -1).Interior.Color = vbRed Then counter = counter + 1 End If If c.Offset(1, 0).Interior.Color = vbRed Then counter = counter + 1 End If If c.Offset(1, 1).Interior.Color = vbRed Then counter = counter + 1 End If c.Value = counter Next For Each c In lifeField If c > 3 Or c < 2 Then c.Interior.Color = vbWhite End If If c = 3 Then c.Interior.Color = vbRed End If If WorksheetFunction.RandBetween(0, 1000) < 1 Then c.Interior.Color = vbRed End If Next End Sub