plClass

Message type set by Message Queuing.

Message Queuing sets the Class property to one of the following values:

Normal messages (all messages created by your application):

MQMSG_CLASS_NORMAL

A normal Message Queuing message.

Positive acknowledgment messages (generated by MSMQ):

MQMSG_CLASS_ACK_REACH_QUEUE

The original message reached its destination queue.

MQMSG_CLASS_ACK_RECEIVE

The original message was retrieved by the receiving application.

Negative arrival acknowledgment messages (generated by MSMQ):

MQMSG_CLASS_NACK_ACCESS_DENIED

The sending application does not have access rights to the destination queue.

MQMSG_CLASS_NACK_BAD_DST_Q

The destination queue is not available to the sending application.

MQMSG_CLASS_NACK_BAD_ENCRYPTION

The destination queue manager could not decrypt a private (encrypted) message (see MSMQMessage.PrivLevel).

MQMSG_CLASS_NACK_BAD_SIGNATURE

Message Queuing could not authenticate the original message. The original message's digital signature is not valid.

MQMSG_CLASS_NACK_COULD_NOT_ENCRYPT

The source queue manager could not encrypt a private message (see MSMQMessage.PrivLevel).

MQMSG_CLASS_NACK_HOP_COUNT_EXCEEDED

The original message's hop count is exceeded.

MQMSG_CLASS_NACK_Q_EXCEED_QUOTA

The original message's destination queue is full.

MQMSG_CLASS_NACK_REACH_QUEUE_TIMEOUT

Either the time-to-reach-queue or time-to-be-received timer expired before the original message reached the destination queue.

For transactional messages, this is an in-doubt negative acknowledgment. For example, the local queue manager sets this class when the message timer expires, even though a positive confirmation might be in route from the remote queue manager.

MQMSG_CLASS_NACK_PURGED

The message was purged before reaching the destination queue.

MQMSG_CLASS_NACK_NOT_TRANSACTIONAL_Q

A transactional message was sent to a nontransactional queue.

MQMSG_CLASS_NACK_NOT_TRANSACTIONAL_MSG

A non-transactional message was sent to a transactional queue.

MQMSG_CLASS_NACK_UNSUPPORTED_CRYPTO_PROVIDER

The target queue manager does not have the enhanced (128-bit) cryptographic provider installed.

Negative read acknowledgment messages (generated by MSMQ):

MQMSG_CLASS_NACK_Q_DELETED

The queue was deleted before the message could be read from the queue.

MQMSG_CLASS_NACK_Q_PURGED

The queue was purged and the message no longer exists.

MQMSG_CLASS_NACK_RECEIVE_TIMEOUT

The original message was not removed from the queue before its time-to-be-received timer expired.

For transactional messages, this means that the remote queue manager has indicated that the message was not retrieved. This is the only negative acknowledgment that can be trusted to indicate the message was not retrieved.

MQMSG_CLASS_NACK_RECEIVE_TIMEOUT_AT_SENDER

For transactional messages only. The local queue manager has indicated that the original message was not removed from the queue before its time-to-be-received timer expired.

This class is an in-doubt negative acknowledgment. For example, the local queue manager sets this class when the time-to-be-received timer expires, even though a positive confirmation may be in route from the remote queue manager.

Report messages (generated by MSMQ):

MQMSG_CLASS_REPORT

Sent each time the message enters or leaves a Message Queuing server.