Как узнать значение параметра в определенном месте реестра?

Public Const HKEY_CLASSES_ROOT = &H80000000
Public Const HKEY_CURRENT_USER = &H80000001
Public Const HKEY_LOCAL_MACHINE = &H80000002
Public Const HKEY_USERS = &H80000003
Public Const HKEY_PERFORMANCE_DATA = &H80000004
Public Const HKEY_CURRENT_CONFIG = &H80000005
Public Const HKEY_DYN_DATA = &H80000006
Public Const KEY_QUERY_VALUE = &H1         'Permission to query subkey data.
Public Const KEY_SET_VALUE = &H2           'Permission to set subkey data.
Public Const KEY_CREATE_SUB_KEY = &H4
Public Const KEY_ENUMERATE_SUB_KEYS = &H8
Public Const KEY_NOTIFY = &H10
Public Const KEY_CREATE_LINK = &H20
Public Const KEY_READ = KEY_QUERY_VALUE Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY
Public Const KEY_WRITE = KEY_SET_VALUE Or KEY_CREATE_SUB_KEY
Public Const KEY_ALL_ACCESS = KEY_QUERY_VALUE Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY Or KEY_CREATE_SUB_KEY Or KEY_CREATE_LINK Or KEY_SET_VALUE
 
Public Const REG_OPTION_NON_VOLATILE = 0&
Public Const REG_OPTION_VOLATILE = &H1
 
Public Type SECURITY_ATTRIBUTES
  nLength As Long
  lpSecurityDescriptor As Long
  bInheritHandle As Long
End Type
 
Public Enum RegTypes
    RegNonee = 0
    RegSZ = 1
    RegExpandSz = 2
    RegBinary = 3
    RegDword = 4
    RegDwordLittleEndian = 4
    RegDwordBigEndian = 5
    RegLink = 6
    RegMultiSz = 7
    RegResourceList = 8
    RegFulResourceDesc = 9
End Enum
 
Declare Function RegOpenKeyEx Lib 'advapi32' 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 RegSetValueEx Lib 'advapi32' Alias 'RegSetValueExA' (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, ByVal szData As String, ByVal cbData As Long) As Long
Declare Function RegCloseKey Lib 'advapi32' (ByVal hKey As Long) As Long
Declare Function RegQueryValueEx Lib 'advapi32' Alias 'RegQueryValueExA' (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, ByRef lpType As Long, ByVal szData As String, ByRef lpcbData As Long) As Long
Declare Function RegCreateKeyEx Lib 'advapi32' 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, ByRef lpSecurityAttributes As SECURITY_ATTRIBUTES, phkResult As Long, lpdwDisposition As Long) As Long
 
Public Function RegGetValue(Root As Long, SubKey As String, Key As String) As String
    Dim Buffer As String, hKey As Long, nType As Long, nSize As Long
    RegGetValue = ''
    If Not RegOpenKeyEx(Root, SubKey, 0, KEY_READ, hKey) Then
        nSize = 0
        RegQueryValueEx hKey, Key, 0, nType, Buffer, nSize
        If hKey And nSize > 0 And nType = RegSZ Then
            Buffer = Space(nSize + 1)
            RegQueryValueEx hKey, Key, 0, nType, Buffer, nSize
            RegGetValue = Left(Buffer, nSize - 1)
            RegCloseKey hKey
        End If
    End If
End Function

Oracle_home = RegGetValue(HKEY_LOCAL_MACHINE, 'SOFTWAREORACLEALL_HOMESID0', 'PATH')