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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Apr 8, 2000



Application Security Testing: An Integral Part of DevOps

EnumRegistryKeys - Retrieve all the subkeys of a Registry 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
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As _
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

                          ' KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY) And (Not 
                          ' SYNCHRONIZE))

' Enumerate registry keys under a given key
' returns a collection of strings

Function EnumRegistryKeys(ByVal hKey As Long, ByVal KeyName As String) As _
    Dim handle As Long
    Dim length As Long
    Dim index As Long
    Dim subkeyName As String
    ' initialize the result collection
    Set EnumRegistryKeys = New Collection
    ' Open the key, exit if not found
    If Len(KeyName) Then
        If RegOpenKeyEx(hKey, KeyName, 0, KEY_READ, handle) Then Exit Function
        ' in all case the subsequent functions use hKey
        hKey = handle
    End If
        ' this is the max length for a key name
        length = 260
        subkeyName = Space$(length)
        ' get the N-th key, exit the loop if not found
        If RegEnumKey(hKey, index, subkeyName, length) Then Exit Do
        ' add to the result collection
        subkeyName = Left$(subkeyName, InStr(subkeyName, vbNullChar) - 1)
        EnumRegistryKeys.Add subkeyName, subkeyName
        ' prepare to query for next key
        index = index + 1
    ' Close the key, if it was actually opened
    If handle Then RegCloseKey handle
End Function
Francesco Balena
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