Specifying the journaling level does not create a queue journal.

Queue journals are system queues created by MSMQ. The application can only read the messages in a journal.

When you store messages in a journal queue, clear these queues periodically to remove messages that are no longer needed.

Messages stored in the journal queue count against the quota for the computer where the journal queue resides (the computer quota is set by the administrator).

To save removed messages in a journal queue, specify PROPID_Q_JOURNAL in the MQQUEUEPROPSstructure and call MQCreateQueuewhen creating the queue.

In the embedded implementation of MSMQ, specifying MQ_JOURNAL with the MQSetQueuePropertiesfunction does not turn journaling on.

To have journaling, you must create a queue with journaling turned on.

To stop storing messages in the journal queue, specify PROPID_Q_JOURNAL in the MQQUEUEPROPSstructure and call MQSetQueueProperties.

When the property value is changed, the remaining messages retrieved from the specified queue will be discarded.

To determine if removed messages are being stored in the journal queue, specify PROPID_Q_JOURNAL in the MQQUEUEPROPSstructure and call MQGetQueuePropertiesand examine its returned value.

By default, MSMQ sets the size of a journal queue to INFINITE. To specify the size of a journal queue, see PROPID_Q_JOURNAL_QUOTA.

The following examples show how PROPID_Q_JOURNAL is specified in the MQQUEUEPROPSstructure for setting and retrieving this property.

To set PROPID_Q_JOURNAL

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aPropID[i] = PROPID_Q_JOURNAL; // Property identifier aVariant[i].vt = VT_UI1; // Type indicator aVariant[i].bVal = MQ_JOURNAL; // Journal queue is used i++;

To retrieve PROPID_Q_JOURNAL

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aPropID[i] = PROPID_Q_JOURNAL; // Property identifier aVariant[i].vt = VT_UI1; // Type indicator i++;

Note:
OS versions prior to 2.12 require the MSMQ add-on pack.