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Message
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| fraeliz |
 Posted: Wed Aug 24, 2011 8:36 am Post subject: MQQueueManager instance gets protected memory error |
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Newbie
Joined: 24 Aug 2011
Posts: 2
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I have been working on this issue for quite a few days and need help.
I am trying to connect to queue manager using vb.net (VS 2008 framework 3.5). When creating instance/connecting to queue manager I am getting the error "Attempted to read or write protected memory. This is often an indication that other memory is corrupt. "
My string is coming from a dataset. If i 'hardcode' the mq manager name to a string I don't get the error. If I assign the string from a dataset or datareader item. I get the error.
Note the error is not thrown in the MQ exception block, but the normal .net exception
Pertinent code is as follows:
| Code: |
Dim mqQMgr As MQQueueManager '* MQQueueManager instance
Dim mqQueue As MQQueue '* MQQueue instance
Dim mqMsg As MQMessage '* MQMessage instance
Dim mqPutMsgOpts As MQPutMessageOptions '* MQPutMessageOptions instance
Dim boolQueueInfoExist As Boolean = True
Dim strExceptionMessage As String = ""
Dim strQueueName As String = ""
Dim intExpirationTime As Integer = 0
Dim strQueueMgr As String = ""
Dim strCommand As String = ""
Dim dsRequest As New DataSet
Try
strCommand = "SELECT mbeq.MSG_QUEUE_NAME, mbeq.MSG_QUEUE_MGR,mbeq.EXPIRATION_TIME "
strCommand = String.Concat(strCommand, " FROM " & STR_CONFIG_DB & ".dbo.trgt_mbe_queue_info mbeq")
strCommand = String.Concat(strCommand, " WHERE mbeq.PZAP_APP_ID = " + "'" + pstrAppId + "'")
strCommand = String.Concat(strCommand, " AND mbeq.PZAP_APP_ID_XCOM = " + "'" + pstrXcomId + "'")
dsRequest = m_objDbConn.ExecuteDataSet(strCommand)
strQueueMgr = CType(dsRequest.Tables(0).Rows(0).Item(1), String)
strQueueName = CType(dsRequest.Tables(0).Rows(0).Item(0), String)
intExpirationTime = CInt(dsRequest.Tables(0).Rows(0).Item(2))
If (strQueueMgr.Length > 0) Then
'* queue manager name provided
mqQMgr = New MQQueueManager(strQueueMgr)
Else
'* queue manage name not provided - use default queue manager
mqQMgr = New MQQueueManager()
End If
Catch mqe As IBM.WMQ.MQException
If m_strAppId <> "EADJ" And m_strAppId <> "EADM" Then
MsgBox("Unable to instantiate MQQueueManager instance named: " & strQueueMgr)
MsgBox("Mqe.Message = " & mqe.Message)
End If
Throw mqe
Catch objException As Exception
dsRequest = Nothing
Throw objException
End Try |
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| muthum_2000 |
| Posted: Tue Sep 27, 2011 8:55 am Post subject: |
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Voyager
Joined: 10 Jul 2006
Posts: 85
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Try to bring down MQ and clear all the semaphores related to mqm.
Then try bringing up the MQ manager and check if your app works. |
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| exerk |
| Posted: Tue Sep 27, 2011 9:11 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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Also search this site. I think something like this came up in the recent past.
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| mqjeff |
| Posted: Tue Sep 27, 2011 9:12 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| I suspect your code is causing a pointer to the field in the result set to be passed in to the MQQueueManager constructor, rather than a copy of the string data in the field in the result set. |
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| fraeliz |
| Posted: Tue Sep 27, 2011 9:48 am Post subject: |
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Newbie
Joined: 24 Aug 2011
Posts: 2
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I don't see a website in the post that refers to one.
For other post on 'pointer', so in this case it does become a .net odbc result set type question.
How does one convert from a 'pointer' type of reference to an actual copy of the string. It's not being passed as a parameter so not a matter of byref or byval type thing. |
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| ankurlodhi |
| Posted: Tue Sep 27, 2011 10:31 am Post subject: |
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Master
Joined: 19 Oct 2010
Posts: 266
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the looks ok. it can be possible that variable you are trying to write is private, or something like that give a try with checking the excess permissions a have scene these kind of errors when i was working on .net.
but its only a guess work from me. u might be missiong something. |
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| gbaddeley |
| Posted: Tue Sep 27, 2011 5:02 pm Post subject: |
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Jedi
Joined: 25 Mar 2003
Posts: 2495
Location: Melbourne, Australia
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| Quote: |
| My string is coming from a dataset. If i 'hardcode' the mq manager name to a string I don't get the error. If I assign the string from a dataset or datareader item. I get the error. |
MQCONN / New MQQueueManager in VB & VB.net seems to be a bit quirky about where the queue manager name comes from. I suggest using a global string variable.
_________________
Glenn |
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