dOPC Client Toolkit

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.

function AsyncRead(aItemList: TdOPCItemList = nil): boolean;
__fastcall boolean AsyncRead(TdOPCItemList aItemList = null);

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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