Registry Change

Please help...

how can I read from VB the value:
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\9.0\Access\Jet\4.0\Engines\systemDb\
Value:'C:\WINDOWS\SYSTEM\...."

and how can I change the Value to another string ??

how can I do it as simple as possible ??

Hi there,
Here's a simple registry class i wrote to READ in values from the registry. insert it into your project n u're welcome to use it.

For writing data into the registry u would need to extend the class your self. But if u're willing to wait for a couple of days, i'm gonna be doing that myself soon.

Cheers. :)

Here u go ....


'=================================================================================================
' FileName : clsRegistry
' Author : Gaurav Mahindra.
' Description : This file contains all the registry constants which are used to read information from registery.
' Callable : GetRegistryNameValue
'=================================================================================================
Option Explicit

Private szBaseKey As String ' Holds the Base key that an object should work with.
Private szBaseHive As REG_HIVES ' Holds the Base key that an object should work with, ex: for the GetSettings
' routine in VB the base Hive is HKEY_CURRENT_USER.
Private szRegKeyRetrieved As String ' Retrieved Values from the Wrapper
Private lRegKeyRetrieved As Long ' for the string as well as DWORD key types

Public Enum REG_KEYTYPE
REG_SZ = 1
REG_BINARY = 3 ' Free form binary
REG_DWORD = 4
End Enum

Private lpKeyType As Long ' DWORD type key value
Private szRegHkey As String ' String type Key value retreived from the registry

Public Enum REG_HIVES
HKEY_CLASSES_ROOT = &H80000000
HKEY_CURRENT_USER = &H80000001
HKEY_LOCAL_MACHINE = &H80000002
HKEY_USERS = &H80000003
HKEY_DYN_DATA = &H80000006
HKEY_CURRENT_CONFIG = &H80000005
End Enum

Private Enum REG_ERROR_CODES
ERROR_SUCCESS = 0&
ERROR_NONE = 0
ERROR_BADDB = 1
ERROR_BADKEY = 2
ERROR_CANTOPEN = 3
ERROR_CANTREAD = 4
ERROR_CANTWRITE = 5
ERROR_OUTOFMEMORY = 6
ERROR_INVALID_PARAMETER = 7
ERROR_ACCESS_DENIED = 8
ERROR_INVALID_PARAMETERS = 87
ERROR_NO_MORE_ITEMS = 259
End Enum


Private Const RESERVED = 0& ' Windows reserved parameter, used by std SDK registry access routines.
Private Const READ_CONTROL = &H20000
Private Const STANDARD_RIGHTS_READ = (READ_CONTROL)
Private Const SYNCHRONIZE = &H100000
Private Const REG_OPTION_NON_VOLATILE = 0
Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000

Private Enum KEY_ACCESS_RIGHTS
KEY_ENUMERATE_SUB_KEYS = &H8
KEY_NOTIFY = &H10
KEY_ALL_ACCESS = &H3F
KEY_QUERY_VALUE = &H1
KEY_READ = ((STANDARD_RIGHTS_READ Or KEY_QUERY_VALUE Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY) And (Not SYNCHRONIZE))
End Enum

Private Type SECURITY_ATTRIBUTES ' Define the SECURITY_ATTRIBUTES structure.
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type

' Reg open Key
Private 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

' Reg Query value Ex
Private Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal Hkey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, ByVal lpData As Any, lpcbData As Long) As Long ' Note that if you declare the lpData parameter as String, you must pass it By Value.

Private 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

Private 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

Private 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

Private Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal Hkey As Long, ByVal lpValueName As String, ByVal RESERVED As Long, ByVal dwType As Long, lpData As Any, ByVal cbData As Long) As Long ' Note that if you declare the lpData parameter as String, you must pass it By Value.
Private 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, lpSecurityAttributes As SECURITY_ATTRIBUTES, phkResult As Long, lpdwDisposition As Long) As Long

' Reg Close key
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal Hkey As Long) As Long

Private Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Long, lpSource As Any, ByVal dwMessageId As Long, _
ByVal dwLanguageId As Long, ByVal lpBuffer As String, ByVal nSize As Long, arguments As Long) As Long
Private Declare Function GetLastError Lib "kernel32" () As Long

Private Function GetRegistryNameValue(Hkey As REG_HIVES, szHkeySubKey As String, szSubKeyName As String, lSubKeyType As REG_KEYTYPE) As Boolean
' _________________________________________________________________________________________
' Sub : GetRegistryNameValue
' Author : Gaurav Mahindra
' Date : 20th January 2000.
' Description : This routine will access the registry and read in the key value based on parameters passed to it.
' Uses : Nothing
' Input : Hkey - Reg hive to read from.
' szHkeySubKey - Reg subkey to read from in the specified hive.
' szSubKeyName - Name of the name-value pait in the registry, that has to be read.
' lSubKeyType - Key type, String, Dword or binary.
' Returns : status - Bool, flags registry read Success/Failure.
' _________________________________________________________________________________________
Dim lSize As Long
Dim lReturn As Long
Dim lHandleToHKEY As Long
Dim lReturnDWORDValue As Long
Dim szReturnStringValue As String
Dim status As Boolean ' Flags whether the registry read was successful or not.

Err.Clear
szReturnStringValue = String$(255, 0) ' Allocate space for the return value to be read in from the registry.
lSize = Len(szReturnStringValue) + 1 ' Then open the registry key, from which information is required.

lReturn = RegOpenKeyEx(Hkey, szHkeySubKey, RESERVED, KEY_QUERY_VALUE, lHandleToHKEY)

If lSubKeyType = REG_SZ Then
lReturn = RegQueryValueEx(lHandleToHKEY, szSubKeyName, RESERVED, lSubKeyType, szReturnStringValue, lSize)
ElseIf lSubKeyType = REG_DWORD Then
lReturn = RegQueryValueExLong(lHandleToHKEY, szSubKeyName, RESERVED, lSubKeyType, lReturnDWORDValue, lSize)
End If

If lReturn <> ERROR_S