VB客户端向ASP web 服务器申请数据出错处理

public Sub getDataFromWWW(ByVal strURL As String, ByVal mode As Boolean, Optional ByVal method As String, Optional ByVal strPostData)
On Error GoTo getDataFromWWW_Err
     Const DNSResolveTime = 10                    'DNS解释时间,超时10秒
     Const WinsockConnectTime = 10    'Winsock连接时间,超时10秒
     Const SentTime = 10                     '发送时间,超时10秒
     Const ReceiveTime = 30                ',接收时间,超时30秒

     Dim xmlObj As String                     'xml目标
     Dim xmlHttp                                  '
     Dim result As String                       '返回结果

102  xmlObj = "MSXML2.ServerXMLHTTP"               '取得xml的串
103  ShowMessageBox "getDataFromWWW", 0, "Perepare Send Request to MyWEB TO USE:" & xmlObj
     'Set xmlHttp = Server.CreateObject(xmlObj)   '原来的版本
104  Set xmlHttp = CreateObject(xmlObj)        '创建http对象
106  xmlHttp.SetTimeOuts DNSResolveTime * 1000, WinsockConnectTime * 1000, SentTime * 1000, ReceiveTime * 1000               'DNS解释时间,  Winsock连接时间,发送时间,接收时间。(单位毫秒)
     'xmlHttp.Open "POST", strURL, False                                        ' POST 可改为get
108  xmlHttp.Open method, strURL & "?" & strPostData, mode                                         ' 取值
     xmlHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"       '"Content-Type: application/x-www-form-urlencoded" & vbCrLf

110  ShowMessageBox "getDataFromWWW", 0, "Send  Request to MyWEB Server :" & strURL & "?" & strPostData,
112  xmlHttp.send
114  If xmlHttp.ReadyState = 4 Then                                   '已返回

116         If xmlHttp.Status = 200 Then                                    '成功
                  'result = xmlHttp.responsebody                              '取得结果
118             result = xmlHttp.responseText
                  RaiseEvent DataArrival(reqSrcObj, result)
120               ShowMessageBox "getDataFromWWW", 0, "MyWEB Server Response Succeed: " & result
              Else                                                                          '页面不存在
                 result = ""                                                           '返回为空串
122                 RaiseEvent BrowserError(xmlHttp.Status, "MyWEB Server Response Failure,No data Return.")
124                 ShowMessageBox "getDataFromWWW", 0, "MyWEB Server Response Failed,resul is NULL. "
              End If
       Else
            result = ""
126            RaiseEvent BrowserError(xmlHttp.ReadyState, "xmlHttp.ReadyState isn't 4 or data does not ready.")
128            ShowMessageBox "getFromURL", 0, "MyWEB Server Response Time OUT,resul is NULL "
Set xmlHttp = Nothing
Exit Sub

getDataFromWWW_Err:
        RaiseEvent BrowserError(Err.number, Erl & " line ERROR," & Err.Description)
130        ShowMessageBox "getDataFromWWW", Err.number, Erl & " line ERROR," & Err.Description
End SUB

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问题是：124，128在网络断掉时没有执行。请问如何解决？ --------------------编程问答-------------------- 用 Winsock 控件实现？感觉 Winsock 在编写时容易出问题.. --------------------编程问答-------------------- 不是用winsock的.

102  xmlObj = "MSXML2.ServerXMLHTTP"              '取得xml的串
103  ShowMessageBox "getDataFromWWW", 0, "Perepare Send Request to MyWEB TO USE:" & xmlObj
    'Set xmlHttp = Server.CreateObject(xmlObj)  '原来的版本
104  Set xmlHttp = CreateObject(xmlObj)        '创建http对象

直接创建MSXML2 http的对象来取得数据.已经设置了超时的时间,但是如果网断掉了,就一直都不会有回应任何的信息.这很奇怪了. --------------------编程问答-------------------- 为何不用纯API? --------------------编程问答-------------------- 支持！

补充：VB ,  网络编程