Save And Load Data From The Registery

'Add a module to your project (In the menu choose Project -> Add Module, Then click Open)
'Add 5 Command Buttons To your Form.
'Insert this code to the module :

Public Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type

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 RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Declare Function RegQueryValueEx Lib "advapi32" 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
Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal _
hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal _
dwType As Long, ByVal lpData As String, ByVal cbData As Long) As Long
Declare Function RegDeleteValue Lib "advapi32.dll" Alias "RegDeleteValueA" _
(ByVal hKey As Long, ByVal lpValueName As String) 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, _
lpSecurityAttributes As SECURITY_ATTRIBUTES, phkResult As Long, _
lpdwDisposition As Long) As Long
Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" _
(ByVal hKey As Long, ByVal lpSubKey As String) As Long
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


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 READ_CONTROL = &H20000
Private Const STANDARD_RIGHTS_READ = (READ_CONTROL)
Private Const STANDARD_RIGHTS_WRITE = (READ_CONTROL)
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 KEY_READ = ((STANDARD_RIGHTS_READ Or _
KEY_QUERY_VALUE Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY) _
And (Not SYNCHRONIZE))
Private Const KEY_EXECUTE = (KEY_READ)
Private Const KEY_WRITE = ((STANDARD_RIGHTS_WRITE Or _
KEY_SET_VALUE Or KEY_CREATE_SUB_KEY) And (Not SYNCHRONIZE))
Private Const REG_BINARY = 3
Private Const REG_CREATED_NEW_KEY = &H1
Private Const REG_DWORD = 4
Private Const REG_DWORD_BIG_ENDIAN = 5
Private Const REG_DWORD_LITTLE_ENDIAN = 4
Private Const REG_EXPAND_SZ = 2
Private Const REG_FULL_RESOURCE_DESCRIPTOR = 9
Private Const REG_LINK = 6
Private Const REG_MULTI_SZ = 7
Private Const REG_NONE = 0
Private Const REG_SZ = 1
Private Const REG_NOTIFY_CHANGE_ATTRIBUTES = &H2
Private Const REG_NOTIFY_CHANGE_LAST_SET = &H4
Private Const REG_NOTIFY_CHANGE_NAME = &H1
Private Const REG_NOTIFY_CHANGE_SECURITY = &H8
Private Const REG_OPTION_BACKUP_RESTORE = 4
Private Const REG_OPTION_CREATE_LINK = 2
Private Const REG_OPTION_NON_VOLATILE = 0
Private Const REG_OPTION_RESERVED = 0
Private Const REG_OPTION_VOLATILE = 1
Private Const REG_LEGAL_CHANGE_FILTER = (REG_NOTIFY_CHANGE_NAME _
Or REG_NOTIFY_CHANGE_ATTRIBUTES Or _
REG_NOTIFY_CHANGE_LAST_SET Or _
REG_NOTIFY_CHANGE_SECURITY)
Private Const REG_LEGAL_OPTION = (REG_OPTION_RESERVED Or _
REG_OPTION_NON_VOLATILE Or REG_OPTION_VOLATILE Or _
REG_OPTION_CREATE_LINK Or REG_OPTION_BACKUP_RESTORE)

Public Sub DeleteRegistryKey(rClass As T_KeyClasses, Path As String)
Dim res As Long
res = RegDeleteKey(rClass, Path)
End Sub

Public Sub DeleteValue(rClass As T_KeyClasses, Path As String, sKey As String)
Dim hKey As Long
Dim res As Long
res = RegOpenKeyEx(rClass, Path, 0, KEY_ALL_ACCESS, hKey)
res = RegDeleteValue(hKey, sKey)
RegCloseKey hKey
End Sub

Public Sub CreateRegistryKey(rClass As T_KeyClasses, Path As String)
Dim hKey As Long
Dim res As Long
Dim y As SECURITY_ATTRIBUTES
Dim Operation As Long
res = RegCreateKeyEx(rClass, Path, 0, "", 0, KEY_ALL_ACCESS, y, hKey, Operation)
RegCloseKey hKey
End Sub

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

Public Function SetRegValue(KeyRoot As T_KeyClasses, Path As String, sKey As _
String, NewValue As String) As Boolean
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
Dim x As Long
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)
Select Case res
Case 2
KeyValType = REG_SZ
Case Is <> 0
GoTo Errore
End Select
Select Case KeyValType
Case REG_SZ
tmpVal = NewValue
Case REG_DWORD
x = Val(NewValue)
tmpVal = ""
For i = 0 To 3
tmpVal = tmpVal & Chr(x Mod 256)
x = x \ 256
Next
End Select
KeyValSize = Len(tmpVal)
res = RegSetValueEx(hKey, sKey, 0, KeyValType, tmpVal, KeyValSize)
If res <> 0 Then GoTo Errore
SetRegValue = True
RegCloseKey hKey
Exit Function
Errore:
SetRegValue = False
RegCloseKey hKey
End Function

'Insert the following code to your form:

Private Sub Command1_Click()
'This will get the value of 'wallpaper' key from
'HKEY_CURRENT_USER\Control Panel\Desktop' path
MsgBox GetRegValue(HKEY_CURRENT_USER, "Control Panel\Desktop", "wallpaper")
End Sub

Private Sub Command2_Click()
'This will create the path 'HKEY_CURRENT_USER\MyKey\MySubKey'
CreateRegistryKey HKEY_CURRENT_USER, "MyKey\MySubKey"
End Sub

Private Sub Command3_Click()
'This will delete the path 'HKEY_CURRENT_USER\MyKey' and all its Sub Directories
DeleteRegistryKey HKEY_CURRENT_USER, "MyKey"
End Sub

Private Sub Command4_Click()
'This will change the value of 'MyKeyName' Key that in the path
'HKEY_CURRENT_USER\MyKey\MySubKey'. To set the Key value you must
'first create the key path (as mention in Command2_Click)
SetRegValue HKEY_CURRENT_USER, "MyKey\MySubKey", "MyKeyName", "MyValue"
End Sub

Private Sub Command5_Click()
'This will delete the Key 'MyKeyName' that found in the path
'HKEY_CURRENT_USER\MyKey\MySubKey'
DeleteValue HKEY_CURRENT_USER, "MyKey\MySubKey", "MyKeyName"
End Sub