Trouble getting code to work on 64 bit

I've been using the following function in my code for a few years now on a 32bit version of AutoCAD and now that my company is switching to 64bit I am having trouble getting it to work. If anyone has the time to take a look and see if they know why it might not be working correctly, I would greatly appreciate it. Thank you.

Function GetCurrentPrinters() As Variant
   
   Dim Buffer() As Long
   Dim PrintInfo() As PRINTER_INFO_4
   Dim NumBytes As Long, NumNeeded As Long, NumPrinters As Long
   Dim RetVal As Long, c As Long, Success As Boolean
   Dim AllPrinters() As String
   
   NumBytes = 3072
   ReDim Buffer(0 To (NumBytes \ 4) - 1) As Long
   
   Success = EnumPrinters(PRINTER_ENUM_LOCAL + PRINTER_ENUM_CONNECTIONS, "", 4, Buffer(0), NumBytes, NumNeeded, NumPrinters)
   If Success Then
       If NumNeeded > NumBytes Then
           NumBytes = NumNeeded
           ReDim Buffer(0 To (NumBytes \ 4) - 1) As Long
           Success = EnumPrinters(PRINTER_ENUM_LOCAL + PRINTER_ENUM_CONNECTIONS, "", 4, Buffer(0), NumBytes, NumNeeded, NumPrinters)
           If Not Success Then
               MsgBox "Error Enumerating Printers", vbInformation, "Message"
           End If
       End If
   Else
       MsgBox "Error Enumerating Printers", vbInformation, "Message"
   End If
   If Success And NumPrinters > 0 Then
       ReDim PrintInfo(0 To NumPrinters - 1) As PRINTER_INFO_4
       For c = 0 To NumPrinters - 1
           PrintInfo(c).pPrinterName = Space(StrLen(Buffer(c * 3)))
           RetVal = PtrToStr(PrintInfo(c).pPrinterName, Buffer(c * 3))
           PrintInfo(c).pServerName = Space(StrLen(Buffer(c * 3 + 1)))
           RetVal = PtrToStr(PrintInfo(c).pServerName, Buffer(c * 3 + 1))
           PrintInfo(c).Attributes = Buffer(c * 3 + 2)
           
       Next c
       
ReDim Preserve AllPrinters(NumPrinters)
       For c = 0 To NumPrinters - 1
       
           
           AllPrinters(c) = PrintInfo(c).pPrinterName
           
       Next c
   Else
       MsgBox "No Printers Found", vbInformation, "Message"
   End If
   GetCurrentPrinters = AllPrinters
   
   
End Function

I had a problem with vba 2013 code not working in 2016 simple fix was vbaman open code got to TOOLS then Reference and in my case it had a 2013 library file linked that was no longer there, untick box save etc and works fine now.

LongPtr vs Long

http://blog.nkadesign.com/2013/vba-for-32-and-64-bit-systems/

Thank you BIGAL and yosso for your replies. I've tried both of your suggestions but unfortunately, neither seemed to work.