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C/C++ Code Example: Setting PROPID_Q_JOURNAL_QUOTA

This example provides an application-defined function that sets the PROPID_Q_JOURNAL_QUOTA property of the journal of an existing queue based on a given maximum journal size provided by the caller.

For information on how Message Queuing uses queue journals, see Target Journaling.

Setting this property on an existing queue changes the maximum size of the queue journal, however, it does not affect messages already in the queue journal.

A direct format name can be passed to this function only for a local private queue.

To set PROPID_Q_JOURNAL_QUOTA

  1. Validate the input parameters provided by the caller.

  2. Define the maximum number of queue properties to be specified and the queue property counter.

  3. Define the MQQUEUEPROPS structure.

  4. Specify PROPID_Q_JOURNAL_QUOTA.

  5. Initialize the MQQUEUEPROPS structure.

  6. Call MQSetQueueProperties to set the maximum size of the queue journal. If the call fails the returned error code is returned to the caller.

Code Example

The following code example can be run on all versions of Message Queuing.

HRESULT SetQueueJournalQuotaProp(
                                 LPCWSTR wszQueueFormatName, 
                                 int iValue
                                 )
{
  
  // Validate the input string.
  if (wszQueueFormatName == NULL)
  {
    return MQ_ERROR_INVALID_PARAMETER;
  }
  
  
  // Define the maximum number of queue properties and a property counter.
  const int NUMBEROFPROPERTIES = 1;
  DWORD cPropId=0;
  
  
  // Define a queue property structure.
  MQQUEUEPROPS   QueueProps;
  QUEUEPROPID    aQueuePropId[NUMBEROFPROPERTIES];
  MQPROPVARIANT  aQueuePropVar[NUMBEROFPROPERTIES];
  HRESULT        aQueuePropStatus[NUMBEROFPROPERTIES];
  HRESULT hr = MQ_OK;
  
  
  // Specify the PROPID_Q_JOURNAL_QUOTA property.
  aQueuePropId[cPropId] = PROPID_Q_JOURNAL_QUOTA;    // Property ID
  aQueuePropVar[cPropId].vt = VT_UI4;                // Type indicator
  aQueuePropVar[cPropId].ulVal = iValue;             // Journal quota
  cPropId++;
  
  
  // Initialize the MQQUEUEPROPS structure.
  QueueProps.cProp = cPropId;
  QueueProps.aPropID = aQueuePropId;
  QueueProps.aPropVar = aQueuePropVar;
  QueueProps.aStatus = aQueuePropStatus;
  
  
  // Set the queue properties.
  hr = MQSetQueueProperties(wszQueueFormatName, &QueueProps);
  return hr;
}
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