How to pass a table name to a function in Excel - vba

Question

I have various settings tables in Excel, each with two column headings Parameter and Value.
I want to pass a specific table's name to a function getParameter that looks up a specific parameter's name in that table, returns the associated parameter's value, and performs all error handling, e.g. with the following code segment:
Function getParameter(....
...
Dim paramterValue as Variant
With Application
parameterValue = .Index([tableName[Value], .Match("parameterName", [tableName[Parameter], 0))
If Not IsError(parameterValue) then
...
Else
...
End If
End With
End Function
How do I define the appropriate function arguments and call the function?

Answer 1

Tables are in VBA selectable as ListObject Object. But those objects are on worksheet scope only. So we must know the worksheet on which the table is placed on to get it using wrksht.ListObjects(tableName).
To be more flexible, we could using Evaluate to evaluate the structured references:
Public Function getParameter(tableName As String, parameterName As Variant) as Variant
Dim parameterValue As Variant
Dim oRangeTValues As Range
Dim oRangeTParameters As Range
Set oRangeTValues = Evaluate("" & tableName & "[Value]")
Set oRangeTParameters = Evaluate("" & tableName & "[Parameter]")
With Application
parameterValue = .Index(oRangeTValues, .Match(parameterName, oRangeTParameters, 0))
If Not IsError(parameterValue) Then
getParameter = parameterValue
Else
getParameter = CStr(parameterValue)
End If
End With
End Function
This will be usable on all worksheets since the table names are on workbook scope in reality.
This is supposed to be used as User Defined Function using a cell formula like =getParameter("TableName","Parameter").

Answer 2

I'll try like this, identifying the sheet and the ListObject corresponding to your TableName :
Function getParameter(ByVal tableName As String, ByVal parameterName As String) As Variant
Dim parameterValue As Variant
Dim RgVal As Range
Dim wS As Worksheet
Dim LOTable As ListObject
Application.Volatile
Set wS = Evaluate(tableName).Parent
Set LOTable = wS.ListObjects(tableName)
Set RgVal = LOTable.DataBodyRange
With Application.WorksheetFunction
parameterValue = .Index(RgVal.Columns(2), .Match(parameterName, RgVal.Columns(1), 0))
End With 'Application.WorksheetFunction
If Not IsError(parameterValue) Then
getParameter = parameterValue
Else
'...
DoEvents
getParameter = CStr(parameterValue)
End If
End Function
Call in VBA :
Sub test_GetParameter()
Debug.Print getParameter("Table1", "testParam")
End Sub
Call in Excel :
= getParameter("Table1", "testParam")

Answer 3

#R3uk Axel Richter's code is sufficient, but yours also works.