如何使用MSMQ发送/接收多播消息?

时间:2015-02-27 19:53:29

标签: c# .net vb.net msmq

有人可以帮我找到一些示例代码,使用您选择的任何.NET语言,使用MSMQ发送和接收多播消息。我四处搜索,看到发送是:

MessaegQueue topic = new MessageQueue("formatname:multicast=234.1.1.1:8081")
topic.Send("Hello out there")

我尝试用Receive做同样的想法:

MessageQueue topic = new MessageQueue("formatname:multicast=234.1.1.1:8081")
topic.Receive();

但我一无所获。任何人都可以展示如何接收多播消息的示例代码吗?还是我发错了?

1 个答案:

答案 0 :(得分:2)

所以我明白了。

发送多播消息:

MessageQueue topic = new MessageQueue("formatname:multicast=234.1.1.1:8081")
topic.Send("Hello out there")

要接收多播消息:

这有点棘手,因为您无法订阅多播地址。您需要做的是创建一个队列,最好创建一个专用队列,该队列将附加到您要监视的多播地址,然后监听您创建的多播地址INSTEAD的专用队列。像这样:

  Dim privMulticastQueue As String = GetPrivateQueueForMulticastAddress("formatname:multicast=234.1.1.1:8081")
  Dim msgq as MessageQueue = GetMessageQueue(privMulticastQueue)
  msgq.MulticastAddress = GetMulticastAddress(destination)
  msgq.Label = "Private Queue for receiving messages from: " & destination
  msgq.Receive()

还有一些支持方法(可能有一种更好的方式来编写它们,所以请随意纠正,但这是我的第一次破解):

 Private Function GetPrivateQueueForMulticastAddress(ByVal dest As String) As String
    Dim privateQ As String = GetMulticastAddress(dest).Replace(".", "_").Replace(":", "_")
    Return ".\Private$\" & privateQ
 End Function

Private Function GetMulticastAddress(ByVal dest As String) As String
    Return dest.Split("=")(1)
End Function

Private Function GetMessageQueue(ByVal dest As String) As MessageQueue   
      Try
           If Not MessageQueue.Exists(dest) Then
             MessageQueue.Create(dest)
            End If

            Dim msgq As MessageQueue = New MessageQueue(dest)
            Return msgq
      Catch ex As Exception
            Throw New EMGException("Failed while trying to use destination: " & dest, ex)
      End Try

End Function