Applies To: Windows 10, Windows 7, Windows 8, Windows 8.1, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server Technical Preview, Windows Vista
Optional. The PrivLevel property of the MSMQQueueInfo object specifies whether the queue accepts private (encrypted) messages, non-private messages, or both.
Property PrivLevel As Long
You can set PrivLevel to any one of the following values:
The queue accepts only non-private (clear) messages.
The queue accepts only private (encrypted) messages.
The default. The queue does not force privacy. It accepts private (encrypted) messages and non-private (clear) messages.
The application can set the privacy level of queues and messages. If the privacy level of the message does not correspond to the privacy level of the queue, the message is rejected by the queue, and, if the sending application requested a negative acknowledgment message when it sent the message, MQMSG_CLASS_BAD_ENCRYPTION is returned to the sending application to indicate the message was rejected.
To specify the privacy level when creating the queue, set the PathName property and the PrivLevel property, and then call the MSMQQueueInfo.Create method.
To reset or retrieve the privacy level of an existing queue, your application must first obtain an MSMQQueueInfo object that represents the queue. This object can be returned by a query using the MSMQQuery.LookupQueue method or created by the sending or receiving application.
Before using an application-created MSMQQueueInfo object, the application must initialize it to refer to the queue by setting its MSMQQueueInfo.PathName or MSMQQueueInfo.FormatName property. For public queues, setting the FormatName property with a cached public format name instead of the PathName property frees Message Queuing from the need to retrieve information stored in the directory service to generate this format name. Direct format names can be used only for local private queues.
To reset the privacy level of an existing queue, set PrivLevel to a new level and call the MSMQQueueInfo.Update method. This method updates the queue information stored by Message Queuing. For public queues, this information is stored in the directory service. For private queues, this information is stored on the local computer.
To retrieve the stored privacy level of a queue, call the MSMQQueueInfo.Refresh method and inspect the PrivLevel property.
Private messages can be encrypted in two ways.
By the sending Queue Manager. For information on how the sending Queue manager encrypts messages, see Message Queuing-Encrypted Messages.
By the sending application. For information on how an application encrypts messages, see Application-Encrypted Messages
Equivalent API Function Property
With function calls, the equivalent property is PROPID_Q_PRIV_LEVEL.
The following examples are included in Using Message Queuing.
|For an example of||See|
|Requesting encryption when sending messages||Visual Basic Code Example: Requesting Encryption|
|Creating a queue that accepts only private messages||Visual Basic Code Example: Enforcing Encryption|
|Setting and retrieving the privacy level of an existing queue||Visual Basic Code Example: Setting MSMQQueueInfo.PrivLevel
Visual Basic Code Example: Retrieving MSMQQueueInfo.PrivLevel
Windows NT/2000/XP: Included in Windows NT 4.0 SP3 and later.
Windows 95/98/Me: Included in Windows 95 and later.
Header: Declared in Mqoai.h.
Library: Use Mqoa.lib.