mshflexgrid模拟鼠标滚轮没反应。 - 编程论坛

前段时间采用代码解决了mshflexgrid鼠标滚轮的功能，能够正常使用。今天电脑加了局域网之后，该功能不能用了。但是别的电脑还正常能使用。请大神帮忙看看，可能是哪里出了问题。程序已经重新安装过，还是这样。
代码如下：

程序代码：

Option Explicit
Public Const GWL_WNDPROC = (-4)
    Public Const WM_COMMAND = &H111
    Public Const WM_MBUTTONDOWN = &H207
    Public Const WM_MBUTTONUP = &H208
    Public Const WM_MOUSEWHEEL = &H20A

    Public Oldwinproc As Long
    Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As Long, _
                            ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

    Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, _
                            ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

    Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, _
                            ByVal nIndex As Long) As Long
Public Function FlexScroll(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
'支持滚轮的滚动
    Select Case wMsg
    Case WM_MOUSEWHEEL
        Select Case wParam
        Case -7864320  '向下滚
            SendKeys "{down}"
        Case 7864320   '向上滚
            SendKeys "{UP}"
        End Select

    End Select
    FlexScroll = CallWindowProc(Oldwinproc, hWnd, wMsg, wParam, lParam)
End Function

程序代码：

Private Sub MSHFlexGrid1_GotFocus()
Oldwinproc = GetWindowLong(Me.hWnd, GWL_WNDPROC)
SetWindowLong Me.hWnd, GWL_WNDPROC, AddressOf FlexScroll
End Sub

Private Sub MSHFlexGrid1_LostFocus()
SetWindowLong Me.hWnd, GWL_WNDPROC, Oldwinproc
End Sub