Excel VBA call function with variable name

Question

I\'m trying to call a function with a variable name that is generated at run time based upon a combo box value. This is straightforward in most languages but I can\'t seem

Answer 1

CallByName is what you'll need to accomplish the task.

example: Code in Sheet1

Option Explicit
Public Function Sum(ByVal x As Integer, ByVal y As Integer) As Long
    Sum = x + y
End Function

Code is Module1 (bas module)

Option Explicit

Sub testSum()
Dim methodToCall As String
methodToCall = "Sum"

MsgBox CallByName(Sheet1, methodToCall, VbMethod, 1, 2)
End Sub

Running the method testSum calls the method Sum using the name of the method given in a string variable, passing 2 parameters (1 and 2). The return value of the call to function is returned as output of CallByName.

Answer 2

The above will work but not with a large number of names

Use Application.Run(MacroName, Parameters)

You have to may sure that there is a macro but it is better than the above as there is no select statement.

Answer 3

You should write a function that accepts the CB value as a parameter and then uses a select case to call the appropriate formatting function.

Something similar to this

Function SelectFormatting(Name as String) As Boolean
Select Case CBinst.Value
Case "Text1":
   SelectFormatting = Text1FormattingFunction()
Case "Text2":
   .
   .
   .
End Select
End Function

Answer 4

With respect to my answer above you might also find this useful to check whether the macro exists

'=================================================================================
'- CHECK IF A MODULE & SUBROUTINE EXISTS
'- VBA constant : vbext_pk_Proc = All procedures other than property procedures.
'- An error is generated if the Module or Sub() does not exist - so we trap them.
'---------------------------------------------------------------------------------
'- VB Editor : Tools/References - add reference TO ......
'-    .... "Microsoft Visual Basic For Applications Extensibility"
'----------------------------------------------------------------------------------
'- Brian Baulsom October 2007
'==================================================================================
Sub MacroExists()
    Dim MyModule As Object
    Dim MyModuleName As String
    Dim MySub As String
    Dim MyLine As Long
    '---------------------------------------------------------------------------
    '- test data
    MyModuleName = "TestModule"
    MySub = "Number2"
    '----------------------------------------------------------------------------
    On Error Resume Next
    '- MODULE
    Set MyModule = ActiveWorkbook.VBProject.vbComponents(MyModuleName).CodeModule
    If Err.Number <> 0 Then
    MsgBox ("Module : " & MyModuleName & vbCr & "does not exist.")
    Exit Sub
    End If
    '-----------------------------------------------------------------------------
    '- SUBROUTINE
    '- find first line of subroutine (or error)
    MyLine = MyModule.ProcStartLine(MySub, vbext_pk_Proc)
    If Err.Number <> 0 Then
    MsgBox ("Module exists      : " & MyModuleName & vbCr _
           & "Sub " & MySub & "( )  : does not exist.")
    Else
    MsgBox ("Module : " & MyModuleName & vbCr _
        & "Subroutine   : " & MySub & vbCr _
        & "Line Number : " & MyLine)
    End If
End Sub
'-----------------------------------------------------------------------------------