Option Explicit

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 RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long

Private Const REG_BINARY = 3
Private Const HKEY_LOCAL_MACHINE = &H80000002
Private Const REG_SZ = 1
' ruta del registro donde Windows guarda la clave (codificada) y la versión
Private Const RUTA_REGISTRO = "SOFTWARE\MICROSOFT\Windows NT\CurrentVersion"
Private Sub Command1_Click()
On Error GoTo mal
Dim VOL_PROD_KEY As String
'El valor de la key se le pasa como parámetro
VOL_PROD_KEY = Text1.Text & Text2.Text & Text3.Text & Text4.Text & Text5.Text
Dim Obj As Object
Dim result As Variant
    VOL_PROD_KEY = UCase(VOL_PROD_KEY)
'Se cambian las letras/numeros a mayusculas
    VOL_PROD_KEY = Replace(VOL_PROD_KEY, "-", "") 'remove hyphens if any
'Se reemplazan los guiones "altos"
    For Each Obj In GetObject("winmgmts:{impersonationLevel=impersonate}").InstancesOf("win32_WindowsProductActivation")
'Se utiliza WMI para acceder a la clase correspondiente
    result = Obj.SetProductKey(VOL_PROD_KEY)
'Se cambia la key de win y se almacena el resultado en una variable
    Next
Exit Sub
mal:
MsgBox "key ingrasada incorrecta"

End Sub




Private Function SacarClave() As String
Dim bID(164) As Byte, bKey(14) As Byte, bAsc(24) As Byte
Dim lBit As Long, hKey As Long

If RegOpenKey(HKEY_LOCAL_MACHINE, RUTA_REGISTRO, hKey) = 0 Then
If RegQueryValueEx(hKey, "DigitalProductId", 0&, REG_BINARY, bID(0), 164) = 0 Then
For lBit = 52 To 66
bKey(lBit - 52) = bID(lBit)
Next lBit
Else
MsgBox "No se puede leer la clave."
SacarClave = ""
Exit Function
End If
Else
MsgBox "No se puede acceder al registro."
SacarClave = ""
Exit Function
End If
'Descodificar la clave
bAsc(0) = Asc("B"): bAsc(1) = Asc("C"): bAsc(2) = Asc("D")
bAsc(3) = Asc("F"): bAsc(4) = Asc("G"): bAsc(5) = Asc("H")
bAsc(6) = Asc("J"): bAsc(7) = Asc("K"): bAsc(8) = Asc("M")
bAsc(9) = Asc("P"): bAsc(10) = Asc("Q"): bAsc(11) = Asc("R")
bAsc(12) = Asc("T"): bAsc(13) = Asc("V"): bAsc(14) = Asc("W")
bAsc(15) = Asc("X"): bAsc(16) = Asc("Y"): bAsc(17) = Asc("2")
bAsc(18) = Asc("3"): bAsc(19) = Asc("4"): bAsc(20) = Asc("6")
bAsc(21) = Asc("7"): bAsc(22) = Asc("8"): bAsc(23) = Asc("9")

Dim i As Integer, j As Integer, sClave As String
For lBit = 24 To 0 Step -1
i = 0
For j = 14 To 0 Step -1
i = i * 256 Xor bKey(j)
bKey(j) = Int(i / 24)
i = i Mod 24
Next j
sClave = Chr(bAsc(i)) & sClave
If lBit Mod 5 = 0 And lBit <> 0 Then sClave = "-" & sClave
Next lBit
SacarClave = sClave
Label1.Caption = SacarClave
End Function

Private Function VerVersion()
Dim lRet As Long
RegOpenKey HKEY_LOCAL_MACHINE, RUTA_REGISTRO, lRet
VerVersion = SacarValorRegistro(lRet, "ProductName")
RegCloseKey lRet
RegOpenKey HKEY_LOCAL_MACHINE, RUTA_REGISTRO, lRet
VerVersion = VerVersion & " - " & SacarValorRegistro(lRet, "CSDVersion")
RegCloseKey lRet
Label2.Caption = "Versión: " & VerVersion
End Function

Function SacarValorRegistro(ByVal HKLM As Long, ByVal sValor As String) As String
Dim lRet As Long, lInfoValor As Long
Dim lLen As Long, sBuffer As String

lRet = RegQueryValueEx(HKLM, sValor, 0, lInfoValor, ByVal 0, lLen)
If lRet = 0 Then
If lInfoValor = REG_SZ Then
sBuffer = String(lLen, Chr$(0))
lRet = RegQueryValueEx(HKLM, sValor, 0, 0, ByVal sBuffer, lLen)
If lRet = 0 Then
SacarValorRegistro = Left$(sBuffer, InStr(1, sBuffer, Chr$(0)) - 1)
End If
ElseIf lInfoValor = REG_BINARY Then
Dim strData As Integer
lRet = RegQueryValueEx(HKLM, sValor, 0, 0, strData, lLen)
If lRet = 0 Then SacarValorRegistro = strData
End If
End If
End Function


Private Sub Form_Load()
Call SacarClave
Call VerVersion

End Sub

Private Sub Timer1_Timer()
Call SacarClave
End Sub

Private Sub Text1_Change()
Dim i As Integer
Dim claves() As String

If Len(Text1.Text) = 29 Then
claves = Split(Text1.Text, "-")
 
For i = 1 To 5
    Controls("Text" & i).Text = claves(i - 1)
Next
End If
 
If Len(Text1.Text) = 5 Then
    Text2.SetFocus
End If
End Sub
 


Private Sub Text2_Change()
If Len(Text2.Text) = Text2.MaxLength Then
    Text3.SetFocus
End If
End Sub

Private Sub Text3_Change()
If Len(Text3.Text) = Text3.MaxLength Then
    Text4.SetFocus
End If
End Sub
Private Sub Text4_Change()
If Len(Text4.Text) = Text4.MaxLength Then
    Text5.SetFocus
End If
End Sub

Me queda una duda, antes de modificar la key no hay que crear una nueva ID ???