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Registry Scanning...

Posted on 2004-08-18
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Last Modified: 2010-05-02
Hi Experts,

I would like to build a program that scans a "Branch" of the registry periodically (about every 2 seconds) for changes and if any change to the branch is found the new "key" that was added is displayed in a msgbox.

The "Branch" I would like to scan is:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects

Could anyone provide sample code to solve the problem?

Thanks,

Rob
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Question by:robbrownuk
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by:
mladenovicz earned 500 total points
ID: 11833987
You will need timer control with Interval 2000

Const ERROR_NO_MORE_ITEMS = 259&
Const HKEY_CURRENT_CONFIG = &H80000005
Const HKEY_LOCAL_MACHINE = &H80000002
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
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 RegEnumKeyEx Lib "advapi32.dll" Alias "RegEnumKeyExA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpName As String, lpcbName As Long, ByVal lpReserved As Long, ByVal lpClass As String, lpcbClass As Long, lpftLastWriteTime As Any) 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, lpData As Any, lpcbData As Long) As Long

Private Sub Timer1_Timer()

    Dim hKey As Long, Cnt As Long, sName As String, sData As String, Ret As Long, RetData As Long
    Const BUFFER_SIZE As Long = 255
    'Set the forms graphics mode to persistent
    Me.AutoRedraw = True
    Me.Print "RegEnumKeyEx"
    Ret = BUFFER_SIZE
    'Open the registry key
    If RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects", hKey) = 0 Then
        'Create a buffer
        sName = Space(BUFFER_SIZE)
        'Enumerate the keys
        While RegEnumKeyEx(hKey, Cnt, sName, Ret, ByVal 0&, vbNullString, ByVal 0&, ByVal 0&) <> ERROR_NO_MORE_ITEMS
            'Show the enumerated key
            Me.Print "  " + Left$(sName, Ret)
            'prepare for the next key
            Cnt = Cnt + 1
            sName = Space(BUFFER_SIZE)
            Ret = BUFFER_SIZE
        Wend
        'close the registry key
        RegCloseKey hKey
    Else
        Me.Print "  Error while calling RegOpenKey"
    End If
    Me.Print vbCrLf + "RegEnumValue"
    Cnt = 0
    'Open a registry key
    If RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects", hKey) = 0 Then
        'initialize
        sName = Space(BUFFER_SIZE)
        sData = Space(BUFFER_SIZE)
        Ret = BUFFER_SIZE
        RetData = BUFFER_SIZE
        'enumerate the values
        While RegEnumValue(hKey, Cnt, sName, Ret, 0, ByVal 0&, ByVal sData, RetData) <> ERROR_NO_MORE_ITEMS
            'show data
            If RetData > 0 Then Me.Print "  " + Left$(sName, Ret) + "=" + Left$(sData, RetData - 1)
            'prepare for next value
            Cnt = Cnt + 1
            sName = Space(BUFFER_SIZE)
            sData = Space(BUFFER_SIZE)
            Ret = BUFFER_SIZE
            RetData = BUFFER_SIZE
        Wend
        'Close the registry key
        RegCloseKey hKey
    Else
        Me.Print "  Error while calling RegOpenKey"
    End If
End Sub
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