后台程序全局钩子获取鼠标滚轮滚动方向(VB6.0)

'复制内容到剪贴板 程序代码
Private Type MSLLHOOKSTRUCT     '鼠标HOOK时lParam指针指向的结构
    pt As POINTAPI
    dwMouseData As Long
    dwFlags As Long
    dwTime As Long
    dwExtraInfo As Long
End Type
Private Const WM_MOUSEWHEEL As Long = &H20A

Private Sub objHookLL_MouseHook(ByVal Code As Long, ByVal wParam As Long, ByVal lParam As Long, lRet As Long)
    '鼠标HOOK事件.
    '要吃了当前消息,把lRet = -1即可.
    If Code = HC_ACTION And wParam = WM_MOUSEWHEEL Then
        Dim stMLL As MSLLHOOKSTRUCT

        Call CopyMemory(ByVal VarPtr(stMLL), ByVal lParam, Len(stMLL))

        With stMLL
            Debug.Print .dwMouseData / 65536        '输出滚轮状态
            '在这里可以得到鼠标坐标以及其它信息
        End With
    End If
    txtMCode.Text = Code
    txtMwParam.Text = wParam
    txtMlParam.Text = lParam
    Debug.Print "   M = " & Code, wParam, lParam
End Sub