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Option Explicit
 
Private Const PM_REMOVE = &H1
 
Private Type POINTAPI
 x As Long
 y As Long
End Type
 
Private Type Msg
 hwnd As Long
 Message As Long
 wParam As Long
 lParam As Long
 time As Long
 pt As POINTAPI
End Type
 
Private Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As Msg, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
Private Declare Function WaitMessage Lib "user32" () As Long
Private bCancel As Boolean
 
Private Const WM_MOUSEWHEEL = 522
 
Private Sub ProcessMessages()
Dim Message As Msg
Do While bCancel = False
 WaitMessage
 If PeekMessage(Message, Me.hwnd, WM_MOUSEWHEEL, WM_MOUSEWHEEL, PM_REMOVE) Then
 If Message.wParam < 0 Then
 Debug.Print "Scroll Down"
 Else
 Debug.Print "Scroll Up"
 End If
 End If
 DoEvents
 Loop
End Sub
 
Private Sub Form_Load()
Me.Show
ProcessMessages
End Sub
 
Private Sub Form_Unload(Cancel As Integer)
 bCancel = True
End Sub