How to convert 32 bit VBA code into 64 bit VBA code

Question

Im trying to run a macro code but since I'm using a 64 bit Excel 2016 this code is not working. Please help me how to fix this.

Private Declare Function FindWindowEx Lib "User32" Alias "FindWindowExA" _
(ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, _
ByVal lpsz2 As String) As Long

Private Declare Function IIDFromString Lib "ole32" _
(ByVal lpsz As Long, ByRef lpiid As GUID) As Long

Private Declare Function AccessibleObjectFromWindow Lib "oleacc" _
(ByVal hWnd As Long, ByVal dwId As Long, ByRef riid As GUID, _
ByRef ppvObject As Object) As Long

Answer 1

These should work on 64 bit Excel

Private Declare PtrSafe Function FindWindowEx Lib "user32" Alias "FindWindowExA" _
  (ByVal hWnd1 As LongPtr, ByVal hWnd2 As LongPtr, ByVal lpsz1 As String, _
  ByVal lpsz2 As String) As LongPtr

Private Declare PtrSafe Function IIDFromString Lib "ole32" _
  (ByVal lpsz As LongPtr, ByRef lpiid As GUID) As Long

Private Declare PtrSafe Function AccessibleObjectFromWindow Lib "oleacc" _
  (ByVal Hwnd As LongPtr, ByVal dwId As Long, ByRef riid As GUID, _
  ByRef ppvObject As Object) As Long

If you need it to run on both you can use the following #If VBA7

#If VBA7 Then
    '64 bit declares here
#Else
    '32 bit declares here
#End If

A nice resource for PtrSafe Win32 API declares can be found here: Win32API_PtrSafe.txt

Answer 2

We need to do following two code changes:

1. Replace Long data type with LongPtr, at all places in the script
2. You need to change the private function declarations as below:

• OLD:

  Private Declare Function GetTimeZoneInformation Lib "kernel32" ( _
             lpTimeZoneInformation As TIME_ZONE_INFORMATION) As Long
  

• NEW:

  Private Declare PtrSafe Function GetTimeZoneInformation Lib "kernel32" ( _
         lpTimeZoneInformation As TIME_ZONE_INFORMATION) As LongPtr