dOPC Client Toolkit Help file
TdOPCGroup.AsyncRead Method
public: __fastcall boolean AsyncRead(
    TdOPCItemList aItemList = nil
public boolean AsyncRead(
    TdOPCItemList aItemList
Visual Basic
Public Function AsyncRead(
    aItemList As TdOPCItemList = nil
) As boolean

AsyncRead performs an asynchronous read of the value, quality and timestamp information for all items either in the group or, if it is not nil, in the parameter aItemList.

The values are returned via the OnDataChange event. The result will be True on successful execution, otherwise False. Reading from the physical device is not affected by the Active state of the group or item.

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