Global Const REG_SZ As Long = 1
Global Const REG_DWORD As Long = 4

Global Const HKEY_CLASSES_ROOT = &H80000000
Global Const HKEY_CURRENT_USER = &H80000001
Global Const HKEY_LOCAL_MACHINE = &H80000002
Global Const HKEY_USERS = &H80000003

Global Const ERROR_NONE = 0
Global Const ERROR_BADDB = 1
Global Const ERROR_BADKEY = 2
Global Const ERROR_CANTOPEN = 3
Global Const ERROR_CANTREAD = 4
Global Const ERROR_CANTWRITE = 5
Global Const ERROR_OUTOFMEMORY = 6
Global Const ERROR_INVALID_PARAMETER = 7
Global Const ERROR_ACCESS_DENIED = 8
Global Const ERROR_INVALID_PARAMETERS = 87
Global Const ERROR_NO_MORE_ITEMS = 259

Global Const KEY_ALL_ACCESS = &H3F

Global Const REG_OPTION_NON_VOLATILE = 0

Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
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
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
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
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
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
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
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 RegDeleteKey& Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String)
Private Declare Function RegDeleteValue& Lib "advapi32.dll" Alias "RegDeleteValueA" (ByVal hKey As Long, ByVal lpValueName As String)


Public Function DeleteKey(lPredefinedKey As Long, sKeyName As String)
' Description:
' This Function will Delete a key
'
' Syntax:
' DeleteKey Location, KeyName
'
' Location must equal HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_lOCAL_MACHINE
' , HKEY_USERS
'
' KeyName is name of the key you wish to delete, it may include subkeys (example "Key1SubKey1")


Dim lRetVal As Long 'result of the SetValueEx function
Dim hKey As Long 'handle of open key

'open the specified key

'lRetVal = RegOpenKeyEx(lPredefinedKey, sKeyName, 0, KEY_ALL_ACCESS, hKey)
lRetVal = RegDeleteKey(lPredefinedKey, sKeyName)
'RegCloseKey (hKey)
End Function

Public Function DeleteValue(lPredefinedKey As Long, sKeyName As String, sValueName As String)
' Description:
' This Function will delete a value
'
' Syntax:
' DeleteValue Location, KeyName, ValueName
'
' Location must equal HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_lOCAL_MACHINE
' , HKEY_USERS
'
' KeyName is the name of the key that the value you wish to delete is in
' , it may include subkeys (example "Key1SubKey1")
'
' ValueName is the name of value you wish to delete

Dim lRetVal As Long 'result of the SetValueEx function
Dim hKey As Long 'handle of open key

'open the specified key

lRetVal = RegOpenKeyEx(lPredefinedKey, sKeyName, 0, KEY_ALL_ACCESS, hKey)
lRetVal = RegDeleteValue(hKey, sValueName)
RegCloseKey (hKey)
End Function

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
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





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
' For strings
Case REG_SZ:
sValue = String(cch, 0)
lrc = RegQueryValueExString(lhKey, szValueName, 0&, lType, sValue, cch)
If lrc = ERROR_NONE Then
vValue = Left$(sValue, cch)
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 CreateNewKey(lPredefinedKey As Long, sNewKeyName As String)
' Description:
' This Function will create a new key
'
' Syntax:
' QueryValue Location, KeyName
'
' Location must equal HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_lOCAL_MACHINE
' , HKEY_USERS
'
' KeyName is name of the key you wish to create, it may include subkeys (example "Key1SubKey1")



Dim hNewKey As Long 'handle to the new key
Dim lRetVal As Long 'result of the RegCreateKeyEx function

lRetVal = RegCreateKeyEx(lPredefinedKey, sNewKeyName, 0&, vbNullString, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, 0&, hNewKey, lRetVal)
RegCloseKey (hNewKey)
End Function


Sub Main()
'Examples of each function:
'CreateNewKey HKEY_CURRENT_USER, "TestKeySubKey1SubKey2"
'SetKeyValue HKEY_CURRENT_USER, "TestKeySubKey1", "Test", "Testing, Testing", REG_SZ
'MsgBox QueryValue(HKEY_CURRENT_USER, "TestKeySubKey1", "Test")
'DeleteKey HKEY_CURRENT_USER, "TestKeySubKey1SubKey2"
'DeleteValue HKEY_CURRENT_USER, "TestKeySubKey1", "Test"
End Sub


Public Function SetKeyValue(lPredefinedKey As Long, sKeyName As String, sValueName As String, vValueSetting As Variant, lValueType As Long)
' Description:
' This Function will set the data field of a value
'
' Syntax:
' QueryValue Location, KeyName, ValueName, ValueSetting, ValueType
'
' Location must equal HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_lOCAL_MACHINE
' , HKEY_USERS
'
' KeyName is the key that the value is under (example: "Key1SubKey1")
'
' ValueName is the name of the value you want create, or set the value of (example: "ValueTest")
'
' ValueSetting is what you want the value to equal
'
' ValueType must equal either REG_SZ (a string) Or REG_DWORD (an integer)

Dim lRetVal As Long 'result of the SetValueEx function
Dim hKey As Long 'handle of open key

'open the specified key

lRetVal = RegOpenKeyEx(lPredefinedKey, sKeyName, 0, KEY_ALL_ACCESS, hKey)
lRetVal = SetValueEx(hKey, sValueName, lValueType, vValueSetting)
RegCloseKey (hKey)

End Function

Public Function QueryValue(lPredefinedKey As Long, sKeyName As String, sValueName As String)
' Description:
' This Function will return the data field of a value
'
' Syntax:
' Variable = QueryValue(Location, KeyName, ValueName)
'
' Location must equal HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_lOCAL_MACHINE
' , HKEY_USERS
'
' KeyName is the key that the value is under (example: "SoftwareMicrosoftWindowsCurrentVersionExplorer")
'
' ValueName is the name of the value you want to access (example: "link")

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(lPredefinedKey, sKeyName, 0, KEY_ALL_ACCESS, hKey)
lRetVal = QueryValueEx(hKey, sValueName, vValue)
'MsgBox vValue
QueryValue = vValue
RegCloseKey (hKey)
End Function