不是我小气，而是网上有大把的现成代码　。

---- 实现应用程序支持鼠标滚轮的关键是，捕获鼠标滚轮的消息 MSH_MOUSEWHEEL、WM_MOUSEWHEEL。其中MSH_MOUSEWHEEL是为95准备的，需要Intellimouse驱动程序，而WM_MOUSEWHEEL是目前各版本Windows（98/NT40/2000）内置的消息。本文主要处理WM_MOUSEWHEEL消息。下面是WM_MOUSEWHEEL的语法。

WM_MOUSEWHEEL
fwKeys = LOWORD(wParam); /* key flags */
zDelta = (short) HIWORD(wParam);
/* wheel rotation */
xPos = (short) LOWORD(lParam);
/* horizontal position of pointer */
yPos = (short) HIWORD(lParam);
/* vertical position of pointer */

---- 其中：fwKeys指出是否有CTRL、SHIFT、鼠标键(左、中、右、附加)按下，允许复合。zDelta传递滚轮滚动的快慢，该值小于零表示滚轮向后滚动（朝用户方向），大于零表示滚轮向前滚动（朝显示器方向）。lParam指出鼠标指针相对屏幕左上的x、y轴坐标。
---- 滚轮按钮相当于普通的三键鼠标的中键，根据滚轮按钮的动作，Windows分别发出WM_MBUTTONUP、WM_MBUTTONDOWN、WM_MBUTTONDBLCLK消息，这些消息VB已经在鼠标事件中支持。

---- 三、实际应用

---- 根据上述原理，给出一个数据库应用的典型例子。

---- 1.用户界面班级和学生一对多的查询，当用户在学生网格以外滚动鼠标滚轮，班级主表前后移动；用户在网格以内滚动鼠标学生明细表垂直移动；如果在网格以内按住鼠标滚轮键并且滚动鼠标，学生明细表水平移动。

---- 2.Form1上ADO Data 控件对象datPrimaryRS的 ConnectionString为"PROVIDER=MSDataShape;Data PROVIDER=MSDASQL;dsn=SCHOOL;uid=;pwd=;"， RecordSelectors 属性的SQL命令文本为"SHAPE {select * from 班级} AS ParentCMD APPEND ({select * from 学生 } AS ChildCMD RELATE 班级名称 TO 班级名称) AS ChildCMD"。

---- 3.TextBox的DataSource均为datPrimaryRS,DataFiled如图所示。

---- 4.窗口下部的网格是DataGrid控件,名称为grdDataGrid。

---- 5.表单From1.frm的清单如下：

Private Sub Form_Load()
Set grdDataGrid.DataSource = _
datPrimaryRS.Recordset("ChildCMD").UnderlyingValue
Hook Me.hWnd
End Sub

Private Sub Form_Unload(Cancel As Integer)
UnHook Me.hWnd
End Sub

---- 6.标准模块Module1.bas清单如下：
Option Explicit
Public Type POINTL
x As Long
y As Long
End Type
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

Declare Function SetWindowLong _
Lib "USER32" Alias "SetWindowLongA" _
(ByVal hWnd As Long, _
ByVal nIndex As Long, _
ByVal dwNewLong As Long) As Long

Declare Function SystemParametersInfo _
Lib "USER32" Alias "SystemParametersInfoA" _
(ByVal uAction As Long, _
ByVal uParam As Long, _
lpvParam As Any, _
ByVal fuWinIni As Long) As Long

Declare Function ScreenToClient Lib "USER32" _
(ByVal hWnd As Long, xyPoint As POINTL) As Long

Public Const GWL_WNDPROC = -4
Public Const SPI_GETWHEELSCROLLLINES = 104
Public Const WM_MOUSEWHEEL = &H20A
Public WHEEL_SCROLL_LINES As Long

Global lpPrevWndProc As Long

Public Sub Hook(ByVal hWnd As Long)
lpPrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, _
AddressOf WindowProc)
'获取"控制面板"中的滚动行数值
Call SystemParametersInfo(SPI_GETWHEELSCROLLLINES, _
0, WHEEL_SCROLL_LINES, 0)
If WHEEL_SCROLL_LINES > Form1.grdDataGrid.VisibleRows Then
WHEEL_SCROLL_LINES = Form1.grdDataGrid.VisibleRows
End If
End Sub

Public Sub UnHook(ByVal hWnd As Long)
Dim lngReturnValue As Long
lngReturnValue = SetWindowLong(hWnd,
GWL_WNDPROC, lpPrevWndProc)
End Sub

Function WindowProc(ByVal hw As Long, _
ByVal uMsg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long
Dim pt As POINTL
Select Case uMsg
Case WM_MOUSEWHEEL
Dim wzDelta, wKeys As Integer
wzDelta = HIWORD(wParam)
wKeys = LOWORD(wParam)
pt.x = LOWORD(lParam)
pt.y = HIWORD(lParam)
'将屏幕坐标转换为Form1.窗口坐标
ScreenToClient Form1.hWnd, pt
With Form1.grdDataGrid

'判断坐标是否在Form1.grdDataGrid窗口内
If pt.x > .Left / Screen.TwipsPerPixelX And _
pt.x < (.Left + .Width) / Screen.TwipsPerPixelX And _
pt.y > .Top / Screen.TwipsPerPixelY And _
pt.y < (.Top + .Height) / Screen.TwipsPerPixelY Then
'滚动明细数据库
If wKeys = 16 Then
'滚动键按下，水平滚动grdDataGrid
If Sgn(wzDelta) = 1 Then
Form1.grdDataGrid.Scroll -1, 0
Else
Form1.grdDataGrid.Scroll 1, 0
End If
Else
'垂直滚动grdDataGrid
If Sgn(wzDelta) = 1 Then
Form1.grdDataGrid.Scroll 0, 0 - WHEEL_SCROLL_LINES
Else
Form1.grdDataGrid.Scroll 0, WHEEL_SCROLL_LINES
End If
End If
Else
'鼠标不在grdDataGrid区域，滚动主数据库
With Form1.datPrimaryRS.Recordset
If Sgn(wzDelta) = 1 Then
If .BOF = False Then
.MovePrevious
If .BOF = True Then
.MoveFirst
End If
End If
Else
If .EOF = False Then
.MoveNext
If .EOF = True Then
.MoveLast
End If
End If
End If
End With
End If
End With
Case Else
WindowProc = CallWindowProc(lpPrevWndProc, hw, _
uMsg, wParam, lParam)
End Select
End Function

Public Function HIWORD(LongIn As Long) As Integer
' 取出32位值的高16位
HIWORD = (LongIn And &HFFFF0000) &H10000
End Function

Public Function LOWORD(LongIn As Long) As Integer
' 取出32位值的低16位
LOWORD = LongIn And &HFFFF&
End Function

谢谢版主,可是我运行这个的时候它立马就退出了,不知道为什么.
不提示错误,没有任何的提示,只是退出.
但我只要把
Public Sub Hook(ByVal hWnd As Long)
lpPrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, _
AddressOf WindowProc)
'获取"控制面板"中的滚动行数值
Call SystemParametersInfo(SPI_GETWHEELSCROLLLINES, _
0, WHEEL_SCROLL_LINES, 0)
If WHEEL_SCROLL_LINES > Form1.grdDataGrid.VisibleRows Then
WHEEL_SCROLL_LINES = Form1.grdDataGrid.VisibleRows
End If
End Sub
标出的那一句给注解掉,它就不会退出,当然,我想要的功能也没了,不知道是什么原因.

版主,这个程序我什么搞它就是不能运行,不知道为什么,我真的好笨
有没有现存的可运行的源程序啊?
这个程序还要有数据库的,搞得我晕呼呼的了.