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ction SHNotify_GetEventStr(strPath1, strPath2 As String, dwEventID As Long) As String
Dim sEvent As String
Select Case dwEventID
Case SHCNE_RENAMEITEM: sEvent = "重命名文件" + strPath1 + "为" + strPath2
Case SHCNE_CREATE: sEvent = "建立文件 文件名：" + strPath1
Case SHCNE_DELETE: sEvent = "删除文件 文件名：" + strPath1
Case SHCNE_MKDIR: sEvent = "新建目录 目录名：" + strPath1
Case SHCNE_RMDIR: sEvent = "删除目录 目录名：" + strPath1
Case SHCNE_MEDIAINSERTED: sEvent = strPath1 + "中插入可移动存储介质"
Case SHCNE_MEDIAREMOVED: sEvent = strPath1 + "中移去可移动存储介质"
Case SHCNE_DRIVEREMOVED: sEvent = "移去驱动器" + strPath1
Case SHCNE_DRIVEADD: sEvent = "添加驱动器" + strPath1
Case SHCNE_NETSHARE: sEvent = "改变目录" + strPath1 + "的共享属性"
Case SHCNE_UPDATEDIR: sEvent = "更新目录" + strPath1
Case SHCNE_UPDATEITEM: sEvent = "更新文件 文件名：" + strPath1
Case SHCNE_SERVERDISCONNECT: sEvent = "断开与服务器的连" + strPath1 + " " + strPath2
Case SHCNE_UPDATEIMAGE: sEvent = "SHCNE_UPDATEIMAGE"
Case SHCNE_DRIVEADDGUI: sEvent = "SHCNE_DRIVEADDGUI"
Case SHCNE_RENAMEFOLDER: sEvent = "重命名文件夹" + strPath1 + "为" + strPath2
Case SHCNE_FREESPACE: sEvent = "磁盘空间大小改变"
Case SHCNE_ASSOCCHANGED: sEvent = "改变文件关联"
End Select
SHNotify_GetEventStr = sEvent
End Function
在mSub.Bas中加入以下代码：
''''mSub函数包括窗口的消息处理函数
Option Explicit
Private Const WM_NCDESTROY = &H82
Private Const GWL_WNDPROC = (-4)
Private Const OLDWNDPROC = "OldWndProc"
Private Declare Function GetProp Lib "user32" Alias "GetPropA" (ByVal _
hWnd As Long, ByVal lpString As String) As Long
Private Declare Function SetProp Lib "user32" Alias "SetPropA" (ByVal _
hWnd As Long, ByVal lpString As String, ByVal hData As Long) As Long
Private Declare Function RemoveProp Lib "user32" Alias "RemovePropA" (ByVal _
hWnd As Long, ByVal lpString As String) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
(ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" _
(ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal uMsg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
Public Function SubClass(hWnd As Long) As Boolean
Dim lpfnOld As Long
Dim fSuccess As Boolean
If (GetProp(hWnd, OLDWNDPROC) = 0) Then
lpfnOld = SetWindowLong(hWnd, GWL_WNDPROC, AddressOf WndProc)
If lpfnOld Then
fSuccess = SetProp(hWnd, OLDWNDPROC, lpfnOld)
End If
End If
If fSuccess Then
SubClass = True
Else
If lpfnOld Then Call UnSubClass(hWnd)
MsgBox "Unable to successfully subclass &H" & Hex(hWnd), vbCritical
End If
End Function
Public Function UnSubClass(hWnd As Long) As Boolean
Dim lpfnOld As Long
lpfnOld = GetProp(hWnd, OLDWNDPROC)
If lpfnOld Then
If RemoveProp(hWnd, OLDWNDPROC) Then
UnSubClass = SetWindowLong(hWnd, GWL_WNDPROC, lpfnOld)
End If
End If
End Function
Public Function WndProc(ByVal hWnd As Long, ByVal uMsg As Long, ByVal wParam As _
Long, ByVal lParam As Long) As Long
Select Case uMsg
Case WM_SHNOTIFY ''''处理系统消息通告函数
Call Form1.NotificationReceipt(wParam, lParam)
Case WM_NCDESTROY
Call UnSubClass(hWnd)
MsgBox "Unubclassed &H" & Hex(hWnd), vbCritical, "WndProc Error"
End Select
WndProc = CallWindowProc(GetProp(hWnd, OLDWNDPROC), hWnd, uMsg, wParam, lParam)
End Function
保存文件，然后运行程序，然后你可以在Explore中试着建立或者删除一个文件或者文件夹，在Form中可以看到你所做的操作已经被纪录并且显示到TextBox中了。
现在分析以下上面的程序，上面的程序首先调用SHChangeNotifyRegister函数将Form添加到系统消息通告链中，并利用SetWindowLong函数改变Form的缺省的消息处理函数，当接受到系统通告消息后，根据传递的参数获得系统通告的内容并且显示在文本窗口中。退出程序时调用SHChangeNotifyDeregister函数注销系统消息通告。
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