Attribute VB_Name = "Registry"
'Types Enum Definition
Public Enum T_KeyClasses
    HKEY_CLASSES_ROOT = &H80000000
    HKEY_CURRENT_CONFIG = &H80000005
    HKEY_CURRENT_USER = &H80000001
    HKEY_LOCAL_MACHINE = &H80000002
    HKEY_USERS = &H80000003
End Enum

Public Enum InTypes
   ValNull = 0
   ValString = 1
   ValXString = 2
   ValBinary = 3
   ValDWord = 4
   ValLink = 6
   ValMultiString = 7
   ValResList = 8
End Enum


' Registry API functions used in this module
Private Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
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
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 String, lpcbData As Long) As Long
Private Declare Function RegEnumValue Lib "advapi32.dll" Alias "RegEnumValueA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpValueName As String, lpcbValueName As Long, ByVal lpReserved As Long, lpType As Long, ByVal lpData As String, lpcbData As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Private 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
Private 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
Private Declare Function RegFlushKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Declare Function RegEnumKey Lib "advapi32.dll" Alias "RegEnumKeyA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpName As String, ByVal cbName As Long) As Long
Private Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String) As Long
Private Declare Function RegDeleteValue Lib "advapi32.dll" Alias "RegDeleteValueA" (ByVal hKey As Long, ByVal lpValueName As String) As Long

'Constants Definition
Private Const SYNCHRONIZE = &H100000
Private Const STANDARD_RIGHTS_ALL = &H1F0000
Private Const KEY_QUERY_VALUE = &H1
Private Const KEY_SET_VALUE = &H2
Private Const KEY_CREATE_LINK = &H20
Private Const KEY_CREATE_SUB_KEY = &H4
Private Const KEY_ENUMERATE_SUB_KEYS = &H8
Private Const KEY_EVENT = &H1
Private Const KEY_NOTIFY = &H10
Private Const KEY_ALL_ACCESS = ((STANDARD_RIGHTS_ALL Or KEY_QUERY_VALUE Or KEY_SET_VALUE Or KEY_CREATE_SUB_KEY Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY Or KEY_CREATE_LINK) And (Not SYNCHRONIZE))
Private Const REG_DWORD = 4
Private Const REG_SZ = 1

' This routine allows you to write values into the entire Registry, it currently
' only handles string and double word values.
'
' Example
' WriteRegistry HKEY_CURRENT_USER, "SOFTWARE\My Name\My App\", "NewSubKey", ValString, "NewValueHere"
' WriteRegistry HKEY_CURRENT_USER, "SOFTWARE\My Name\My App\", "NewSubKey", ValDWord, "31"
'
Public Sub WriteRegistry(ByVal Group As Long, ByVal Section As String, ByVal Key As String, ByVal ValType As InTypes, ByVal Value As Variant)
Dim lResult As Long
Dim lKeyValue As Long
Dim InLen As Long
Dim lNewVal As Long
Dim sNewVal As String
On Error Resume Next
lResult = RegCreateKey(Group, Section, lKeyValue)
If ValType = ValDWord Then
   lNewVal = CLng(Value)
   InLen = 4
   lResult = RegSetValueExLong(lKeyValue, Key, 0&, ValType, lNewVal, InLen)
Else
   ' Fixes empty string bug - spotted by Marcus Jansson
   If ValType = ValString Then Value = Value + Chr(0)
   sNewVal = Value
   InLen = Len(sNewVal)
   lResult = RegSetValueExString(lKeyValue, Key, 0&, 1&, sNewVal, InLen)
End If
lResult = RegFlushKey(lKeyValue)
lResult = RegCloseKey(lKeyValue)
End Sub

' This routine enumerates the subkeys under any given key
' Call repeatedly until "Not Found" is returned - store values in array or something
'
' Example - this example just adds all the subkeys to a string - you will probably want to
' save then into an array or something.
'
' Dim Res, NewLine As String
' Dim i As Long
' Res = ReadRegistryGetSubkey(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\", i)
' NewLine = ""
' Do Until Res = "Not Found"
'   Text1.Text = Text1.Text & NewLine & Res
'   i = i + 1
'   Res = ReadRegistryGetSubkey(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\", i)
'   NewLine = Chr(13) & Chr(10)
' Loop

Public Function ReadRegistryGetSubkey(ByVal Group As Long, ByVal Section As String, Idx As Long) As String
Dim lResult As Long, lKeyValue As Long, lDataTypeValue As Long, lValueLength As Long, sValue As String, td As Double
On Error Resume Next
lResult = RegOpenKey(Group, Section, lKeyValue)
sValue = Space$(2048)
lValueLength = Len(sValue)
lResult = RegEnumKey(lKeyValue, Idx, sValue, lValueLength)
If (lResult = 0) And (Err.Number = 0) Then
   sValue = Left$(sValue, InStr(sValue, Chr(0)) - 1)
Else
   sValue = "Not Found"
End If
lResult = RegCloseKey(lKeyValue)
ReadRegistryGetSubkey = sValue
End Function

'Get a specific Registry Value (to access the Default Registry Key Value set sKey parameter as "")
Public Function GetRegValue(KeyRoot As T_KeyClasses, path As String, sKey As String) As String
    
    Dim hKey As Long
    Dim KeyValType As Long
    Dim KeyValSize As Long
    Dim KeyVal As String
    Dim tmpVal As String
    Dim res As Long
    Dim i As Integer

    res = RegOpenKeyEx(KeyRoot, path, 0, KEY_ALL_ACCESS, hKey)
    If res <> 0 Then GoTo Errore
    tmpVal = String(1024, 0)
    KeyValSize = 1024
    res = RegQueryValueEx(hKey, sKey, 0, KeyValType, tmpVal, KeyValSize)
    If res <> 0 Then GoTo Errore
    If (Asc(Mid(tmpVal, KeyValSize, 1)) = 0) Then
        tmpVal = Left(tmpVal, KeyValSize - 1)
    Else
        tmpVal = Left(tmpVal, KeyValSize)
    End If
    Select Case KeyValType
    Case REG_SZ
        KeyVal = tmpVal
    Case REG_DWORD
        For i = Len(tmpVal) To 1 Step -1
            KeyVal = KeyVal + Hex(Asc(Mid(tmpVal, i, 1)))
        Next
        KeyVal = Format("&h" + KeyVal)
    End Select
    GetRegValue = KeyVal
    RegCloseKey hKey
    Exit Function

Errore:
    GetRegValue = ""
    RegCloseKey hKey
End Function