Excel VBA - Determine if a Module is included in a project

Question

I am currently working on a project where I am unable to verify that all modules are installed. There is a growing group of modules being used for common functions for programs I work with. I have tried some solutions on the web which I couldn't use as I am unfamiliar with Activeworkbook.VBProject.VBComponents() methods.

It was mentioned that I should check tools reference for Microsoft Visual Basic For Applications Extensibility and I checked that with no result. Any help would be appreciated. :)

References:

https://www.mrexcel.com/forum/excel-questions/284317-vba-function-check-if-particular-macro-exists.html

https://www.devhut.net/2010/12/09/ms-access-vba-determine-if-a-module-exists/

here is my code:

Option Explicit

Public Function Is_Module_Loaded(name As String) As Boolean
    Dim Module As Object
    Dim Module_Name As String
    Module_Name = name
    Is_Module_Loaded = False


    On Error GoTo errload
        Set Module = ActiveWorkbook.VBProject.VBComponents(Module_Name).CodeModule

    Is_Module_Loaded = True

    If (0 <> 0) Then
errload:
        MsgBox ("MODULE: " & Module_Name & " is not installed please add")
        Stop
    End If

End Function

When Running the Code I don't get any error that is very helpful excluding my own which is reporting wrong saying my module is absent when it isn't.

Answer 1

So I believe I have found a solution.

Credit to: Tim Williams, Mathieu Guindon and Joe Phi (See link) for guidance to the solution

Reference: (https://stackoverflow.com/a/46727898/10297459)

Noted problems: With the original Tim mentioned that not setting a workbook could have me referencing the proper workbook, this was the major problem as I had other workbooks open that it was trying to reference.

    Option Explicit

Public Function Is_Module_Loaded(name As String, Optional wb As Workbook) As Boolean 
'!!!need to reference: microsoft visual basic for applications extensibility 5.3
        Dim j As Long
        Dim vbcomp As VBComponent
        Dim modules As Collection
            Set modules = New Collection
        Is_Module_Loaded = False

    'check if value is set

        If wb Is Nothing Then
            Set wb = ThisWorkbook
        End If
        If (name = "") Then
            GoTo errorname
        End If

    'collect names of files
        For Each vbcomp In ThisWorkbook.VBProject.VBComponents

            If ((vbcomp.Type = vbext_ct_StdModule) Or (vbcomp.Type = vbext_ct_ClassModule)) Then
                modules.Add vbcomp.name
            End If

        Next vbcomp

    'Compair the file your looking for to the collection
        For j = 1 To modules.Count
            If (name = modules.Item(j)) Then
                Is_Module_Loaded = True
            End If
        Next j
        j = 0

    'if Is_module_loaded not true
        If (Is_Module_Loaded = False) Then
            GoTo notfound
        End If

    'if error
        If (0 <> 0) Then
errorname:
            MsgBox ("Function BootStrap.Is_Module_Loaded Was not passed a Name of Module")
            Stop
        End If
        If (0 <> 0) Then
notfound:
            MsgBox ("MODULE: " & name & " is not installed please add")
            Stop
        End If

End Function

Answer 2

EDIT: updated to add the workbook as a second parameter

Try this:

Sub tester()

    Debug.Print Is_Module_Loaded(ThisWorkbook, "Module4")
    Debug.Print Is_Module_Loaded(ActiveWorkbook, "Module4")

End sub


Public Function Is_Module_Loaded(wb as Workbook, name As String) As Boolean

    Dim Module As Object

    On Error Resume Next
    Set Module = wb.VBProject.VBComponents(name).CodeModule
    On Error GoTo 0

    Is_Module_Loaded = Not Module Is Nothing

    If Not Is_Module_Loaded Then
        MsgBox ("MODULE: " & name & " is not installed in '" & _
                wb.Name & "' please add")
    End If

End Function