How to check for empty array in vba macro

Question

I want to check for empty arrays. Google gave me varied solutions but nothing worked. Maybe I am not applying them correctly.

Function GetBoiler(ByVal sFile As String) As String
'Email Signature
    Dim fso As Object
    Dim ts As Object
    Set fso = CreateObject("Scripting.FileSystemObject")
    Set ts = fso.GetFile(sFile).OpenAsTextStream(1, -2)
    GetBoiler = ts.ReadAll
    ts.Close
End Function

Dim FileNamesList As Variant, i As Integer
' activate the desired startfolder for the filesearch
FileNamesList = CreateFileList("*.*", False) ' Returns File names
' performs the filesearch, includes any subfolders
' present the result
' If there are Signatures then populate SigString
Range("A:A").ClearContents
For i = 1 To UBound(FileNamesList)
    Cells(i + 1, 1).Formula = FileNamesList(i)
Next i

SigString = FileNamesList(3)

If Dir(SigString) <> "" Then
    Signature = GetBoiler(SigString)
Else
    Signature = ""
End If

Here if FileNamesList array is empty, GetBoiler(SigString) should not get called at all. When FileNamesList array is empty, SigString is also empty and this calls GetBoiler() function with empty string. I get an error at line

Set ts = fso.GetFile(sFile).OpenAsTextStream(1, -2)

since sFile is empty. Any way to avoid that?

Answer 1

As you are dealing with a string array, have you considered Join?

If Len(Join(FileNamesList)) > 0 Then