Option Explicit
Private Declare Sub CopyMemory Lib "KERNEL32" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal Length As Long)
Private Declare Function SetWindowLongA Lib "user32" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function CallWindowProcA Lib "user32" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Const GWL_WNDPROC As Long = -4
Private Const WM_DESTROY As Long = &H2
 
Private PrevWndProc As Long
Private bvASM(40) As Byte

Private Declare Function DestroyWindow Lib "user32.dll" (ByVal hwnd As Long) As Long
Private Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long
Private Const WS_VISIBLE As Long = &H10000000
Private mWnd As Long

Public Function WindowProc(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    WindowProc = CallWindowProcA(PrevWndProc, hwnd, Msg, wParam, lParam)
 
    If Msg = WM_DESTROY Then
        Call StopSubclassing(hwnd)
    End If
   
    Debug.Print Msg, wParam, lParam
End Function
 
Private Sub SetSubclassing(Obj As Object, hwnd As Long)
    Dim WindowProcAddress As Long
    Dim pObj As Long
    Dim pVar As Long
 
    Dim i As Long
 
    For i = 0 To 40
        bvASM(i) = Choose(i + 1, &H55, &H8B, &HEC, &H83, &HC4, &HFC, &H8D, &H45, &HFC, &H50, &HFF, &H75, &H14, _
                                 &HFF, &H75, &H10, &HFF, &H75, &HC, &HFF, &H75, &H8, &H68, &H0, &H0, &H0, &H0, _
                                 &HB8, &H0, &H0, &H0, &H0, &HFF, &HD0, &H8B, &H45, &HFC, &HC9, &HC2, &H10, &H0)
    Next i
 
    pObj = ObjPtr(Obj)
 
    Call CopyMemory(pVar, ByVal pObj, 4)
    Call CopyMemory(WindowProcAddress, ByVal (pVar + 28), 4)
 
    Call LongToByte(pObj, bvASM, 23)
    Call LongToByte(WindowProcAddress, bvASM, 28)
 
    PrevWndProc = SetWindowLongA(hwnd, GWL_WNDPROC, VarPtr(bvASM(0)))
End Sub
 
Private Sub StopSubclassing(hwnd)
    Call SetWindowLongA(hwnd, GWL_WNDPROC, PrevWndProc)
End Sub
 
Private Sub LongToByte(ByVal lLong As Long, ByRef bReturn() As Byte, Optional i As Integer = 0)
    bReturn(i) = lLong And &HFF
    bReturn(i + 1) = (lLong And 65280) / &H100
    bReturn(i + 2) = (lLong And &HFF0000) / &H10000
    bReturn(i + 3) = ((lLong And &HFF000000) \ &H1000000) And &HFF
End Sub

Private Sub Class_Initialize()
    mWnd = CreateWindowEx(0&, "Button", "Hola Mundo", WS_VISIBLE, 0&, 0&, 300, 300, 0&, 0&, App.hInstance, ByVal 0&)
    If mWnd <> 0 Then Call SetSubclassing(Me, mWnd)
End Sub

Private Sub Class_Terminate()
    If mWnd <> 0 Then
        Call StopSubclassing(mWnd)
        DestroyWindow mWnd
    End If
End Sub

Call CopyMemory(WindowProcAddress, ByVal (pVar + 1784), 4)

        Dim sCode As String

   
        sCode = "90FF05000000006A0054FF742418FF742418FF742418FF7424186800000000B800000000FFD0FF0D00000000A10000000085C075" & _
                "0458C21000A10000000085C0740458C2100058595858585868008000006A00680000000051B800000000FFE00000000000000000"
               
        For i = 0 To Len(sCode) - 1 Step 2
            bvASM(i / 2) = CByte("&h" & Mid$(sCode, i + 1, 2))
        Next