Global Const REG_SZ As Long = 1
Global Const REG_DWORD As Long = 4
Global Const HKEY_CLASSES_ROOT = &H80000000
Global Const HKEY_CURRENT_USER = &H80000001
Global Const HKEY_LOCAL_MACHINE = &H80000002
Global Const HKEY_USERS = &H80000003
Global Const ERROR_NONE = 0
Global Const ERROR_BADDB = 1
Global Const ERROR_BADKEY = 2
Global Const ERROR_CANTOPEN = 3
Global Const ERROR_CANTREAD = 4
Global Const ERROR_CANTWRITE = 5
Global Const ERROR_OUTOFMEMORY = 6
Global Const ERROR_INVALID_PARAMETER = 7
Global Const ERROR_ACCESS_DENIED = 8
Global Const ERROR_INVALID_PARAMETERS = 87
Global Const ERROR_NO_MORE_ITEMS = 259
Global Const KEY_ALL_ACCESS = &H3F
Global Const REG_OPTION_NON_VOLATILE = 0

Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Declare Function RegCreateKeyEx Lib "advapi32.dll" Alias "RegCreateKeyExA" _
   (ByVal hKey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, _
   ByVal lpClass As String, ByVal dwOptions As Long, ByVal samDesired As Long, _
   ByVal lpSecurityAttributes As Long, phkResult As Long, lpdwDisposition As Long) As Long
Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias "RegOpenKeyExA" _
   (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, _
   ByVal samDesired As Long, phkResult As Long) As Long
Declare Function RegQueryValueExString Lib "advapi32.dll" Alias "RegQueryValueExA" _
   (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, _
   lpType As Long, ByVal lpData As String, lpcbData As Long) As Long
Declare Function RegQueryValueExLong Lib "advapi32.dll" Alias "RegQueryValueExA" _
   (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, _
   lpType As Long, lpData As Long, lpcbData As Long) As Long
Declare Function RegQueryValueExNULL Lib "advapi32.dll" Alias "RegQueryValueExA" _
   (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, _
   lpType As Long, ByVal lpData As Long, lpcbData As Long) As Long
Declare Function RegSetValueExString Lib "advapi32.dll" Alias "RegSetValueExA" _
   (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, _
   ByVal dwType As Long, ByVal lpValue As String, ByVal cbData As Long) As Long
Declare Function RegSetValueExLong Lib "advapi32.dll" Alias "RegSetValueExA" _
   (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, _
   ByVal dwType As Long, lpValue As Long, ByVal cbData As Long) As Long

Function WriteValueEx(ByVal hKey As Long, sValueName As String, lType As Long, vValue As Variant) As Long
   Dim lValue As Long
   Dim sValue As String
   Select Case lType
      Case REG_SZ
         sValue = vValue & Chr$(0)
         WriteValueEx = RegSetValueExString(hKey, sValueName, 0&, lType, sValue, Len(sValue))
      Case REG_DWORD
         lValue = vValue
         WriteValueEx = RegSetValueExLong(hKey, sValueName, 0&, lType, lValue, 4)
   End Select
End Function

Function ReadValueEx(ByVal lhKey As Long, ByVal szValueName As String, vValue As Variant) As Long
   Dim cch As Long
   Dim lrc As Long
   Dim lType As Long
   Dim lValue As Long
   Dim sValue As String
   On Error GoTo ReadValueExError
   lrc = RegQueryValueExNULL(lhKey, szValueName, 0&, lType, 0&, cch)
   Select Case lType
      Case REG_SZ:
         sValue = String(cch, 0)
         lrc = RegQueryValueExString(lhKey, szValueName, 0&, lType, sValue, cch)
         If lrc = ERROR_NONE Then
            vValue = Left$(sValue, cch - 1)
         Else
            vValue = Empty
         End If
      Case REG_DWORD:
         lrc = RegQueryValueExLong(lhKey, szValueName, 0&, lType, lValue, cch)
         If lrc = ERROR_NONE Then vValue = lValue
      Case Else
         lrc = -1
   End Select
ReadValueExExit:
    ReadValueEx = lrc
    Exit Function
ReadValueExError:
    Resume ReadValueExExit
End Function

Sub CreateNewKey(lPredefinedKey As Long, sNewKeyName As String)
   Dim hNewKey As Long
   Dim lRetVal As Long
   lRetVal = RegCreateKeyEx(lPredefinedKey, sNewKeyName, 0&, vbNullString, _
            REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, 0&, hNewKey, lRetVal)
   RegCloseKey (hNewKey)
End Sub

Function WriteKeyValue(lPredefinedKey As Long, sKeyName As String, sValueName As String, _
                  vValueSetting As Variant, lValueType As Long)
   Dim lRetVal As Long      'result of the SetValueEx function
   Dim hKey As Long         'handle of open key
   lRetVal = RegOpenKeyEx(lPredefinedKey, sKeyName, 0, KEY_ALL_ACCESS, hKey)
   lRetVal = WriteValueEx(hKey, sValueName, lValueType, vValueSetting)
   RegCloseKey (hKey)
End Sub

Function ReadKeyValue(lPredefinedKey As Long, sKeyName As String, sValueName As String, _
                     sDefValue As String) As Variant
   Dim lRetVal As Long
   Dim hKey As Long
   Dim vValue As Variant
   lRetVal = RegOpenKeyEx(lPredefinedKey, sKeyName, 0, KEY_ALL_ACCESS, hKey)
   lRetVal = ReadValueEx(hKey, sValueName, vValue)
   If lRetVal = 0 Then
      ReadKeyValue = vValue
   Else
      ReadKeyValue = sDefValue
   End If
   RegCloseKey (hKey)
End Function