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| MQAX200 not Browsing when Amqdnet does. |
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| dunesand |
 Posted: Wed Mar 17, 2004 2:15 am Post subject: MQAX200 not Browsing when Amqdnet does. |
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Acolyte
Joined: 17 Nov 2003
Posts: 65
Location: Cambridgeshire, UK
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Due to client insistence on something we've just been informed about, I'm having to revert my c# code from using CSD05's .Net interface, to using the ActiveX control.
Just been playing around tring to convert the objects from .Net, to ActiveX (via the interop VS kindly creates for me  ) and I came upon a problem.
I first browse a queue, then process the message on it, where process involves possilble manipulating, and posting of data, before going back and then reading the message off the queue, so that if things go to pot half way through a message being processed (eg. some idiot pulls the server plug), my program will just pick up where it left off, not loosing the message in transit.
Worked a treat with the amqdnet.dll, now doesn't work with mqax200.dll...
It doesn't throw the 2033 exception when a message is there, but doesn't retrieve the string from "ReadString" on the message.
Code snippet below (inside a continual while loop):
| Code: |
// create the queue
MQQueue queue = null;
if ( queue == null )
{
queue = (MQQueue) m_QMgr.AccessQueue( m_szQueue,
(int)MQ.MQOO_FAIL_IF_QUIESCING + (int)MQ.MQOO_BROWSE,
"", "", "" );
}
while ( Global.bListening )
{
Global.nMessagesInReceive++;
MQMessage mqMsg = (MQMessage)m_AXsession.AccessMessage();//new MQMessage();
MQGetMessageOptions mqGetMsgOps = (MQGetMessageOptions)m_AXsession.AccessGetMessageOptions();
mqGetMsgOps.WaitInterval = m_nPollDelay;
mqGetMsgOps.Options += (int)MQ.MQGMO_BROWSE_NEXT;
try
{
// Get call appears to correctly fetch a COM object message
queue.Get( mqMsg, mqGetMsgOps, 0 );
// ReadString is call (i.e.mqMsg is NOT null), but returns null
string newdata = mqMsg.ReadString( mqMsg.MessageLength );
if ( newdata != null )
{
// we never get here
if ( newdata != "" )
{
data = newdata;
m_szData = data;
// if all's well, return with data as the new message data
Global.nMessagesInReceive--;
return eResult.RES_SUCCESS ;
}
}
}
catch ( Exception ex )
{
Global.nMessagesInReceive--;
// if ( m_AXsession.ReasonCode == MQ.MQRC_NO_MSG_AVAILABLE )
{
continue;
}
m_szExceptionError = ex.Message;
return eResult.RES_ERROR;
}
} // end while
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Thanks for your help.
Much appreaciated.
Daniel.
Last edited by dunesand on Wed Mar 17, 2004 3:32 am; edited 1 time in total |
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| dunesand |
| Posted: Wed Mar 17, 2004 2:44 am Post subject: |
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Acolyte
Joined: 17 Nov 2003
Posts: 65
Location: Cambridgeshire, UK
|
------ 11:03
it must be the Get (..., ..., 0 ) call.
When reading the documentation I thought this property was optional, and defaulted to zero.
MessageLength is zero, and the ReasonName is "NONE"
----- 11:31
i really don't understand this... put in another value, say 1024 or MaxMessageLength, and still is null on ReadString. |
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