Loop Though All UDF Names in Project

Question

This question: Searching for function usage in Excel VBA got me thinking about a process for automating a search for all UDFs being used in a spreadsheet. Something along the lines of:

For Each UDF in Module1
    If Cells.Find(What:=UDF.Name, After:="A1", LookIn:=xlFormulas, _
        LookAt:=xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
        MatchCase:=False) Then
        MsgBox UDF.Name & " is in use"
    End If
Next UDF

Is this possible and if so, what would the syntax be for looping through all UDFs?

Answer 1

Option Explicit

' Add reference to Microsoft Visual Basic for Applications Extensibility 5.3 Library

Public Sub FindFunctionUsage()
    Dim udfs
    udfs = ListProcedures("Module1")
    If Not IsArray(udfs) Then _
        Exit Sub

    Dim udf
    Dim findResult

    For Each udf In udfs
        Set findResult = Cells.Find(What:="=" & udf, After:=Cells(1), LookIn:=xlFormulas, _
            LookAt:=xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
            MatchCase:=False)

        If Not findResult Is Nothing Then _
            MsgBox udf & " is in use"
    Next udf
End Sub

' Source for ListProcedures : http://www.cpearson.com/excel/vbe.aspx
Private Function ListProcedures(moduleName As String)
        Dim VBProj As VBIDE.VBProject
        Dim VBComp As VBIDE.VBComponent
        Dim CodeMod As VBIDE.CodeModule
        Dim LineNum As Long
        Dim NumLines As Long
        Dim WS As Worksheet
        Dim rng As Range
        Dim ProcName As String
        Dim ProcKind As VBIDE.vbext_ProcKind

        Set VBProj = ActiveWorkbook.VBProject
        Set VBComp = VBProj.VBComponents(moduleName)
        Set CodeMod = VBComp.CodeModule

        Dim result
        With CodeMod
            LineNum = .CountOfDeclarationLines + 1
            Do Until LineNum >= .CountOfLines
                ProcName = .ProcOfLine(LineNum, ProcKind)
                If ProcKindString(ProcKind) = "Sub Or Function" Then
                    If IsArray(result) Then
                        ReDim Preserve result(LBound(result) To UBound(result) + 1)
                    Else
                        ReDim result(0 To 0)
                    End If
                    result(UBound(result)) = ProcName
                End If

                LineNum = .ProcStartLine(ProcName, ProcKind) + _
                        .ProcCountLines(ProcName, ProcKind) + 1
            Loop
        End With
        ListProcedures = result
    End Function

    Function ProcKindString(ProcKind As VBIDE.vbext_ProcKind) As String
        Select Case ProcKind
            Case vbext_pk_Get
                ProcKindString = "Property Get"
            Case vbext_pk_Let
                ProcKindString = "Property Let"
            Case vbext_pk_Set
                ProcKindString = "Property Set"
            Case vbext_pk_Proc
                ProcKindString = "Sub Or Function"
            Case Else
                ProcKindString = "Unknown Type: " & CStr(ProcKind)
        End Select
    End Function

' Content of Module1
Public Sub Sub1()

End Sub

Public Function Func1(ByRef x As Range)

End Function

Public Sub Sub2()

End Sub