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The machine . is the local computer. For Each q As MessageQueue In MessageQueue.GetPrivateQueuesByMachine( . ) Debug.WriteLine(String.Format( FormatName={0}, Id={1}, Transactional={2}", _ q.FormatName, q.Id, q.Transactional)) Next
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The FormatName property of a queue is a GUID that identifies the queue or a string in the form DIRECT=OS:servername\private$\queuename, as in
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FormatName=DIRECT=OS:myserver\private$\samplequeue
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You can also create a public queue by using the servername\queuename syntax, but this syntax isn t supported if MSMQ is installed in workgroup mode. You typically cre ate a queue by using a piece of code like the following:
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Const QUEUE_NAME As String = .\private$\SampleQueue" Dim queue As MessageQueue Try Create the queue if it doesn t exist already. If Not MessageQueue.Exists(QUEUE_NAME) Then False means the queue isn t transactional.
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queue = MessageQueue.Create(QUEUE_NAME, False)
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queue.Label = MySampleQueue"
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queue.EncryptionRequired = EncryptionRequired.Optional
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Else queue = New MessageQueue(QUEUE_NAME) End If Catch ex As Exception MessageBox.Show(ex.Message, Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try
You can reference a queue by its path (for example, myserver\private$\samplequeue) or the label associated with the queue, as in the following:
Dim q2 As New MessageQueue( Label:MySampleQueue )
The path and the label must be resolved internally to the format name, however, and therefore they add a little overhead. Moreover, the Format Name Direct syntax is the only syntax that allows access to private queues on remote computers, so it is the rec ommended one. You can use the Purge instance method to delete all the messages in the queue or the Delete shared method to remove the entire queue:
Delete all messages from the queue. queue.Purge() Delete the queue from MSMQ. MessageQueue.Delete(queue.Path)
In general, only an administrator can create and delete queues; if the previous code runs under a nonadministrator account, it raises an Access Denied error.
31:
Serviced Components
Note You can also create a MessageQueue object at design time, by dragging and dropping it either from the Server Explorer window or from the Components tab of the Toolbox. One of the benefits of design-time creation is the ability to create an installer class that automates the process of creating the queue on the target machine.
Sending Messages
You send a message to a queue by calling the Send method of a MessageQueue object. This method takes the message body in its first argument and a second, optional argument that specifies a label for the message (not to be confused with the label of the queue):
Dim msg As String = This is my first MSMQ message" queue.Send(msg, Sample Message )
You can see actual sent messages in the MMC snap-in, and you can double-click a mes sage to browse its properties, including the actual bytes of the message body. (See Fig ure 31-22.)
Figure 31-22
Looking at messages and their properties in the Message Queuing MMC snap-in
The value that you pass to the first argument of the Send method can be any primitive value or any .NET object that can be serialized to XML for example, a DataSet or a public class that you define and that has a public default constructor. (See the note at the end of 23 for more details about XML serialization.) A single MSMQ mes sage can t contain more than 4 megabytes of data.
Part VII:
Advanced Topics
You can better control the message and its other properties by explicitly creating a Message object, as in this code:
Dim m As New Message
Set label, body, and priority.
m.Label = txtLabel.Text
m.Body = txtMessage.Text
m.Priority = MessagePriority.High
Send the message in binary format.
m.Formatter = New BinaryMessageFormatter
This message must be received within one hour.
m.TimeToBeReceived = New TimeSpan(1, 0, 0)
The message must be recoverable in case of system failure.
m.Recoverable = True
Send the message to the queue.
queue.Send(m)
Using the BinaryMessageFormatter instead of the XmlMessageFormatter (the default formatter) usually improves performance but makes debugging harder. You can also set a default formatter for the queue instead of creating it for each individual message:
queue.Formatter = New BinaryMessageFormatter
You should use only one type of formatter in a given application, because the receiver program must set the Formatter property of the queue or the message in advance to match the formatter used when sending the message.
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