Attribute VB_Name = "basRegistry"
Option Explicit

' Hkey cache (used for logging purposes)
Private Type HKEY_CACHE
    hKey As Long
    strHkey As String
End Type

Private hkeyCache() As HKEY_CACHE

'Registry security options
Public Const READ_CONTROL = &H20000
Public Const KEY_QUERY_VALUE = &H1
Public Const KEY_SET_VALUE = &H2
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_ALL_ACCESS = &H3F
Public Const KEY_ALL_ACCESS = KEY_QUERY_VALUE + KEY_SET_VALUE + _
                                KEY_CREATE_SUB_KEY + KEY_ENUMERATE_SUB_KEYS + _
                                KEY_NOTIFY + KEY_CREATE_LINK + READ_CONTROL
                     
'Registry root keys
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

'Registry API return value
Public Const ERROR_SUCCESS = 0
Public Const ERROR_FAIL = -1
Public Const ERROR_NONE = 0
Public Const ERROR_BADDB = 1
Public Const ERROR_BADKEY = 2
Public Const ERROR_CANTOPEN = 3
Public Const ERROR_CANTREAD = 4
Public Const ERROR_CANTWRITE = 5
Public Const ERROR_OUTOFMEMORY = 6
'Public Const ERROR_INVALID_PARAMETER = 7   'old
Public Const ERROR_ARENA_TRASHED = 7
Public Const ERROR_ACCESS_DENIED = 8
Public Const ERROR_INVALID_PARAMETERS = 87
Public Const ERROR_NO_MORE_ITEMS = 259

'Registry options
Public Const REG_OPTION_NON_VOLATILE = 0

'Registry datatypes
Public Const REG_NONE As Long = 0                           ' No value type
Public Const REG_SZ As Long = 1                            ' Unicode nul terminated string
Public Const REG_EXPAND_SZ As Long = 2                   ' Unicode nul terminated string (with environment variable references)
Public Const REG_BINARY As Long = 3                         ' Free form binary
Public Const REG_DWORD As Long = 4                          ' 32-bit number
Public Const REG_DWORD_BIG_ENDIAN  As Long = 5              ' 32-bit number
Public Const REG_LINK As Long = 6                           ' Symbolic Link (unicode)
Public Const REG_MULTI_SZ As Long = 7                       ' Multiple Unicode strings
Public Const REG_RESOURCE_LIST As Long = 8                  ' Resource list in the resource map
Public Const REG_FULL_RESOURCE_DESCRIPTOR As Long = 9      ' Resource list in the hardware description
Public Const REG_RESOURCE_REQUIREMENTS_LIST As Long = 10
Public Const REG_QWORD As Long = 11                         ' 64-bit number

'Primary registry location for SysInfo application
Public Const kRegKeySysInfoKey                  As String = "SOFTWARE\Microsoft\Shared Tools\MSINFO"
Public Const kRegKeySysInfoSubKey               As String = "PATH"

'Secondary registry location for SysInfo application
Public Const kRegKeySysInfoSecondaryKey         As String = "SOFTWARE\Microsoft\Shared Tools Location"
Public Const kRegValueSysInfoSecondarySubKey    As String = "MSINFO"

'Registry API declarations
Public Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal szSubKey As String, hkeyResult As Long) As Long
'Public Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias "RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, ByVal samDesired As Long, ByRef phkResult As Long) As Long
Public 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
Public Declare Function RegQueryValue Lib "advapi32.dll" Alias "RegQueryValueA" (ByVal hKey As Long, ByVal szSubKey As String, ByVal szValue As String, chValue As Long) As Long
Public Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, ByRef lpType As Long, ByVal lpData As String, ByRef lpcbData As Long) As Long
Public 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
Public 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
Public 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
Public Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Public Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal szSubKey As String, hkeyResult As Long) As Long
Public 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
Public Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal szSubKey As String) As Long
Public Declare Function RegEnumKey Lib "advapi32.dll" Alias "RegEnumKeyA" (ByVal hKey As Long, ByVal iSubKey As Long, ByVal szBuffer As String, ByVal cbBuf As Long) As Long
Public Declare Function RegSetValue Lib "advapi32.dll" Alias "RegSetValueA" (ByVal hKey As Long, ByVal szSubKey As String, ByVal fdwType As Long, ByVal lpszValue As String, ByVal cb As Long) As Long
Public Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, ByVal lpszValueName As String, ByVal dwReserved As Long, ByVal fdwType As Long, lpbData As Any, ByVal cbData As Long) As Long
Public 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
Public 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
Public Declare Function GetCurrentProcessId Lib "kernel32.dll" () As Long

Public Function CheckKey(ByVal lhKey As Long, sKeyName As String) As Long
    Dim lRetVal As Long         'result of the API functions
    Dim hKey As Long         'handle of opened key
    lRetVal = RegOpenKeyEx(lhKey, sKeyName, 0, KEY_QUERY_VALUE, hKey)
    If (lRetVal = ERROR_NONE) Then RegCloseKey (hKey)
    CheckKey = lRetVal
End Function

Public Sub CreateNewKey(ByVal hKey As Long, sNewKeyName As String)
    Dim hNewKey As Long         'handle to the new key
    Dim lRetVal As Long         'result of the RegCreateKeyEx function
    lRetVal = RegCreateKeyEx(hKey, sNewKeyName, 0&, vbNullString, _
                                REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, 0&, hNewKey, lRetVal)
    RegCloseKey (hNewKey)
End Sub

Public Function SetValueEx(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)
            SetValueEx = RegSetValueExString(hKey, sValueName, 0&, lType, sValue, Len(sValue))
        Case REG_DWORD
            lValue = vValue
            SetValueEx = RegSetValueExLong(hKey, sValueName, 0&, lType, lValue, 4)
    End Select
End Function

Public Function QueryValueEx(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 QueryValueExError

    ' Determine the size and type of data to be read
    lrc = RegQueryValueExNULL(lhKey, szValueName, 0&, lType, 0&, cch)
    If lrc <> ERROR_NONE Then Error 5

    Select Case lType
        Case REG_SZ:    ' For strings
            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
        ' For DWORDS
        Case REG_DWORD:
            lrc = RegQueryValueExLong(lhKey, szValueName, 0&, _
                                        lType, lValue, cch)
            If lrc = ERROR_NONE Then vValue = lValue
        Case Else
            'all other data types not supported
            lrc = -1
    End Select

QueryValueExExit:
    QueryValueEx = lrc
    Exit Function

QueryValueExError:
    Resume QueryValueExExit
End Function
                
Public Function QueryValue(ByVal lhKey As Long, sKeyName As String, sValueName As String, vValue As Variant) As Long
    Dim lRetVal As Long         'result of the API functions
    Dim hKey As Long         'handle of opened key
    'Dim vValue As Variant      'setting of queried value
    lRetVal = RegOpenKeyEx(lhKey, sKeyName, 0, KEY_QUERY_VALUE, hKey)
    lRetVal = QueryValueEx(hKey, sValueName, vValue)
    RegCloseKey (hKey)
    QueryValue = lRetVal
End Function
            
Public Sub SetKeyValue(ByVal lhKey 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

    'open the specified key
    lRetVal = RegOpenKeyEx(lhKey, sKeyName, 0, _
                              KEY_SET_VALUE, hKey)
    lRetVal = SetValueEx(hKey, sValueName, lValueType, vValueSetting)
    RegCloseKey (hKey)
End Sub

'return HKEY text string representing root key
Public Function strGetPredefinedHKEYString(ByVal hKey As Long) As String
    Select Case hKey
        Case HKEY_CLASSES_ROOT
            strGetPredefinedHKEYString = "HKEY_CLASSES_ROOT"
        Case HKEY_CURRENT_USER
            strGetPredefinedHKEYString = "HKEY_CURRENT_USER"
        Case HKEY_LOCAL_MACHINE
            strGetPredefinedHKEYString = "HKEY_LOCAL_MACHINE"
        Case HKEY_USERS
            strGetPredefinedHKEYString = "HKEY_USERS"
    End Select
End Function

' Delete a key
Public Sub DeleteKey(ByVal lhKey As Long, sParentKey As String, sKeyName As String)
    Dim hKey As Long
    'Open the parent key
    If RegOpenKeyEx(lhKey, sParentKey, 0&, KEY_ALL_ACCESS, hKey) <> ERROR_SUCCESS Then
        Exit Sub    'Error opening parentkey
    End If
    If (sKeyName = "") Then Exit Sub
    RegDeleteKey hKey, sKeyName     ' Delete the subkey.
    RegCloseKey hKey                ' Close the key.
End Sub