Adding a Custom Aggregate to a DDK driver

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Originally published on Geo SCADA Knowledge Base by Anonymous user | June 10, 2021 01:02 AM

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As the DDK manual specifies, a custom aggregate can be added to any of the DDK classes as follows.

VB Sample

 _Public FTAgg As FileTransferClientAgg

where FileTransferClientAgg is the name of the class you have derived from the aggregate class.

Frequent Problem

The following error can be caused when adding a custom aggregate

07-NOV-2007 15:42:30.625 00F0 [FWKMET ADTModule]     Aggregate: FTAgg07-NOV-2007 15:42:30.625 00F0 [FWKERR ADTModule] Object reference not set to an instance of an object.

One cause of this problem is missing the table attribute for the derived class.

The class should be defined as follows

 _Public Class FileTransferClientAggInherits ClearSCADA.DBObjFramework.Aggregate


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Anonymous user

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