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  9. Subscribing to MultipleItems

Subscribing to MultipleItems

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29 Apr 2012 18:30 #837 by support
Subscribing to MultipleItems was created by support
From: Zbynek Zahradnik
Sent: Sunday, March 25, 2012 6:37 AM
To: P.
Subject: RE: Subscribing to MultipleItems
Peter,
The answer is No. You will receive just the items that have changed, and there can therefore be number of entries in MultipleItemsChanged event between 1 and the total count of items subscribed.
Also note that the without regard for which of SubscribeItem/SubscribeMultipleItems method you use, the effect is that each change of a subscribed item always appears in both ItemChanged and MultipleItemsChanged events. I.e., SubscribeItem is NOT tied to just ItemChanged and SubscribeMultipleItems is NOT tied to just MultipleItemsChanged.
Kind regard,
Zbynek Zahradnik, OPC Labs
Original Message
From: P.
Sent: Friday, March 23, 2012 10:57 PM
To: Zbynek Zahradnik
Subject: Subscribing to MultipleItems
Zbynek
If I subscribe to 10 items using the subscribemultipleitems method and then monitor the multipleitemschanged event to monitor changes to the subscribed items will the returned array always contain the same number of entries or will the number of entries be dependent on the number of items that have changed?
Regards
P.

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  1. Forum
  3. Discussions
  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Subscribing to MultipleItems
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