Automatically update macro when changing filename - vba

Question

I have the following macro to filter specific data out of my directory with employee hours files and place it into my zmaster file. However, I need various master documents for various projects (EG. change name to: "project 300000"). When I change my master file name from zmaster to anything else, my macro cannot find the appropriate file, obviously.
Is there a way to change my macro in such a way that zmaster.xlsm is automatically replaced in my macro by the current file name?
Option Explicit
Sub CopyToMasterFile()
Dim MasterWB As Workbook
Dim MasterSht As Worksheet
Dim MasterWBShtLstRw As Long
Dim FolderPath As String
Dim TempFile
Dim CurrentWB As Workbook
Dim CurrentWBSht As Worksheet
Dim CurrentShtLstRw As Long
Dim CurrentShtRowRef As Long
Dim CopyRange As Range
Dim ProjectNumber As String
FolderPath = "C:\test\"
TempFile = Dir(FolderPath)
Dim WkBk As Workbook
Dim WkBkIsOpen As Boolean
'Check if zmaster is open already
For Each WkBk In Workbooks
If WkBk.Name = "zmaster.xlsm" Then WkBkIsOpen = True
Next WkBk
If WkBkIsOpen Then
Set MasterWB = Workbooks("zmaster.xlsm")
Set MasterSht = MasterWB.Sheets("Sheet1")
Else
Set MasterWB = Workbooks.Open(FolderPath & "zmaster.xlsm")
Set MasterSht = MasterWB.Sheets("Sheet1")
End If
ProjectNumber = MasterSht.Cells(1, 1).Value
Do While Len(TempFile) > 0
'Checking that the file is not the master and that it is a xlsx
If Not TempFile = "zmaster.xlsm" And InStr(1, TempFile, "xlsx", vbTextCompare) Then
Set CopyRange = Nothing
'Note this is the last used Row, next empty row will be this plus 1
With MasterSht
MasterWBShtLstRw = .Cells(.Rows.Count, "A").End(xlUp).Row
End With
Set CurrentWB = Workbooks.Open(FolderPath & TempFile)
Set CurrentWBSht = CurrentWB.Sheets("Sheet1")
With CurrentWBSht
CurrentShtLstRw = .Cells(.Rows.Count, "A").End(xlUp).Row
End With
For CurrentShtRowRef = 1 To CurrentShtLstRw
If CurrentWBSht.Cells(CurrentShtRowRef, "A").Value = ProjectNumber Then
'This is set to copy from Column A to Column L as per the question
If CopyRange Is Nothing Then
'If there is nothing in Copy range then union wont work
'so first row of the work sheet needs to set the initial copyrange
Set CopyRange = CurrentWBSht.Range("A" & CurrentShtRowRef & _
":L" & CurrentShtRowRef)
Else
'Union is quicker to be able to copy from the sheet once
Set CopyRange = Union(CopyRange, _
CurrentWBSht.Range("A" & CurrentShtRowRef & _
":L" & CurrentShtRowRef))
End If ' ending If CopyRange Is Nothing ....
End If ' ending If CurrentWBSht.Cells....
Next CurrentShtRowRef
CopyRange.Select
'add 1 to the master file last row to be the next open row
CopyRange.Copy MasterSht.Cells(MasterWBShtLstRw + 1, 1)
CurrentWB.Close savechanges:=False
End If 'ending If Not TempFile = "zmaster.xlsx" And ....
TempFile = Dir
Loop
ActiveSheet.Range("A1:L200").RemoveDuplicates Columns:=Array(1, 2, 4, 8, 9, 10, 11, 12), Header:=xlYes
End Sub

Answer 1

One way to escape from hard coded workbook names is to use ActiveWorkbook or ThisWorkbook objects - they both return instance of Workbook object.
ThisWorkbook
Returns a Workbook object that represents the workbook
where the current macro code is running. Read-only.
ActiveWorkbook
Returns a Workbook object that represents the workbook in the active
window (the window on top). Read-only. Returns Nothing if there are no
windows open or if either the Info window or the Clipboard window is
the active window.
Then you can get the name of the workbook with Name property of the returned Workbook object.
Another way could be if you pass such a data as parameter to your functions.
For example:
Sub CopyToMasterFile(wbName as String, sheetName as String)
In this variant if you call your Sub from another macro code, you can pass whatever you want to use - this ways you can escape the hard coded stuff in your functions.
This is also valid for the Worksheet objects - have a look on the ActiveSheet