ua.client.TdOPCUAClient.ReadNodeAttributes

Reads one or more Attributes of one or more Nodes.

Delphi

function ReadNodeAttributes(NodeIds: TArray<string>; Attributes: TArray<integer>; TimestampsToReturn: integer = uaTimestampsToReturn.Neither): TArray<uaDataValue>;

C++

__fastcall TArray<uaDataValue> ReadNodeAttributes(TArray<string> NodeIds, TArray<integer> Attributes, int TimestampsToReturn = uaTimestampsToReturn.Neither);

Description

This method can be used to read one or more Attributes of one or more Nodes. It returns an array of uaDataValues.

Parameter	Description
NodeIds	String array of nodes.
Attributes	Defines which attributes we want to read. For further information look also at: TuaAttributes
TimestampsToReturn	Defines which timestamps you want to return (look also at: uaTimestampsToReturn) Default is Neither, which means the method returns no timestamps.
Result	An array of uaDataValues

Example

Copy Code

program dOPUACTest; uses variants, ua.client, ua.buildintypes; var OPCClient: TdOPCUAClient; Results: TArray<uaDataValue>; begin OPCClient := TdOPCUAClient.Create(nil); OPCClient.Url := 'opc.tcp://opcuaserver.com:48010'; OPCClient.Active := true; Results := OPCClient.ReadNodeAttributes(['i=2259', 'i=2263'],[TuaAttributes.DisplayName, TuaAttributes.Value]); Writeln(Results[0].ValueToVariant+' has value: '+VarToStr(Results[1].ValueToVariant)); Writeln(Results[2].ValueToVariant+' has value: '+VarToStr(Results[3].ValueToVariant)); Writeln('Press Enter to exit'); Readln; OPCClient.Free; end.