C# and IBM WebSphere MQ message borwsing

[How Gee]

Hello, Can anyone help me, how can i browse the all messages in the queue? i have found several examples to get or put the messages, but about the browsing i haven't. The folloing example is browse the first messages, but i would like to see the all messages... MQQueueManager mqQMgr; MQQueue mqQueue; MQMessage mqMsg = new MQMessage(); MQGetMessageOptions mqGetMsgOpts = new MQGetMessageOptions(); mqQMgr = new MQQueueManager(qmName); mqQueue = mqQMgr.AccessQueue(qName, MQC.MQOO_BROWSE | MQC.MQGMO_LOGICAL_ORDER // open queue for browse + MQC.MQOO_FAIL_IF_QUIESCING); mqGetMsgOpts.Options = MQC.MQGMO_WAIT | MQC.MQGMO_BROWSE_FIRST; mqQueue.Get(mqMsg, mqGetMsgOpts); MessageBox.Show(mqMsg.ReadString(mqMsg.TotalMessageLength)); Thanx, Gee

[Gavin Jerman]

Replace MQC.MQGMO_BROWSE_FIRST with MQC.MQGMO_BROWSE_NEXT and call Get in a loop until it fails - it will throw a harmless exception with a reason code of MQRC_NO_MSG_AVAILABLE when there are no more messages to browse. I would also suggest that you use MQGMO_NO_WAIT rather than MQGMO_WAIT so that you don't have to wait until a message appears on the queue when you browse an empty queue. Example code using home-brewed helper methods:

public bool browseMessages(out ArrayList messages, string queue)
{
// browse (i.e. get without removing) a message on the message queue
messages = new ArrayList();
MQQueueManager mqQM = null;
MQQueue mqQ = null;

  try
  {
    if (queue == null || queue.Length == 0)
      throw new Exception("Queue name required");

    // connect to queue manager
    connectManager(out mqQM);

    // open queue with required access
    connectQueue(mqQM, queue, MQC.MQOO\_FAIL\_IF\_QUIESCING + MQC.MQOO\_BROWSE, out mqQ);

    // get message options
    MQGetMessageOptions mqGMO = new MQGetMessageOptions();
    mqGMO.Options = MQC.MQGMO\_FAIL\_IF\_QUIESCING + MQC.MQGMO\_NO\_WAIT + MQC.MQGMO\_BROWSE\_NEXT; // browse with no wait
    mqGMO.MatchOptions = MQC.MQMO\_NONE; // no matching required

    MQMessage mqMsg = new MQMessage(); // object to receive the message

    // browse all messages on the queue
    while (true)
    {
      // browse message - exception will be thrown when no more messages
      mqQ.Get(mqMsg, mqGMO);

      // get message text from the message object
      messages.Add(mqMsg.ReadString(mqMsg.MessageLength));
    }
  }
  catch (MQException mqex)
  {
    if (mqex.ReasonCode == MQC.MQRC\_NO\_MSG\_AVAILABLE)
    {
      // harmless exception MQ throws to indicate that there are no messages on the queue
      return true;
    }
    else
      throwMQException(mqex);
  }
  finally
  {
    if (mqQ != null)
      mqQ.Close();

    if (mqQM != null)
      mqQM.Disconnect();
  }

  return false;
}

Gavin