Form1 ：
Private Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long
Private Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long
Private Const WH_MOUSE_LL As Long = 14
Private Sub Form_Load()
hHook = SetWindowsHookEx(WH_MOUSE_LL, AddressOf HookProc, App.hInstance, 0)
End Sub
Private Sub Form_Unload(Cancel As Integer)
Call UnhookWindowsHookEx(hHook)
End Sub
Module1：
Public Const WM_MOUSEMOVE = &H200
Public Const WM_LBUTTONDOWN = &H201
Public Const WM_LBUTTONUP = &H202
Public Const WM_LBUTTONDBLCLK = &H203
Public Const WM_RBUTTONDOWN = &H204
Public Const WM_RBUTTONUP = &H205
Public Const WM_RBUTTONDBLCLK = &H206
Public Const WM_MBUTTONDOWN = &H207
Public Const WM_MBUTTONUP = &H208
Public Const WM_MBUTTONDBLCLK = &H209
Public Const WM_MOUSEACTIVATE = &H21
Public Const WM_MOUSEFIRST = &H200
Public Const WM_MOUSELAST = &H209
Public Const WM_MOUSEWHEEL = &H20A '以上是鼠标的各个值
Private Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, lParam As Any) As Long
Public Function HookProc(ByVal nCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If nCode < 0 Then
HookProc = CallNextHookEx(hHook, nCode, wParam, lParam)
Exit Function
End If
If wParam = WM_MOUSEWHEEL Then
MsgBox "滚动"
End If
End Function
网上很多都是线程钩子，窗体激活时才有效，我的是后台获取，
如何得到滚动方向？
