Receive(String,PubSubBuffer,PubSubHeaderData,Int32) Method

This command is used in conjunction with the blocking method, and not the SubscribeCB method. If subscriptions are made with SubscribeCB and then this method is called, an exception will be raised indicating incompatible usage of callback and blocking methods. If the application requires asynchronous delivery through callbacks, then SubscribeCB should be used with a callback delegate, rather than and .

This method is useful if the application wants to process messages in a synchronous manner from a special processing thread or a pool of such threads.

If the receive method is used with a global connection (as specified through using the Connect command with no arguments), then all and calls share the same interface and therefore the same incoming and outgoing message queues. The result of this sharing is that two different threads using and calls cannot be guaranteed that they will receive messages that they have subscribed to as these messages may go to the other thread calling . This is useful for thread-pooling, where multiple threads are handling the incoming messages independent of the subscribing threads, but if the subscribing thread also expects to be the exclusive receiver of its subscriptions, then a non-global connection is needed.

• C#

PubSubConnection PS = new PubSubConnection();
PS.OpenConnection("192.168.10.10", 5051);
PS.Subscribe("mySystem.MyTopic", PubSubUpdateFlag.PS_INTEGRITY);
while (true)
{
    PS.Receive(topic, Buff, HeaderData, -1);
}

Target Platforms: For information on software requirements, refer to the AVEVA Enterprise SCADA Supported Configurations documentation.

Reference

PubSubConnection Class
PubSubConnection Members
Overload List
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