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Trying to read OPC UA value with Delphi
29 Aug 2017 10:56 #5457
by eh
Trying to read OPC UA value with Delphi was created by eh
I'm trying to read a value from a tag on my OPC UA server.
Therefore I used following code, but I get an error(see attachment). What am I missing or doing wrong?
Therefore I used following code, but I get an error(see attachment). What am I missing or doing wrong?
var Client: TEasyUAClient;
Value: OleVariant;
DataDialog: TUADataDialog;
Endpoint, Node: string;
begin
DataDialog := TUADataDialog.Create(nil);
DataDialog.UserPickEndpoint := True;
DataDialog.ShowDialog(nil);
Endpoint := DataDialog.EndpointDescriptor.ToString;
Node := DataDialog.NodeDescriptor.ToString;
Client := TEasyUAClient.Create(nil);
Value := Client.ReadValue(DataDialog.EndpointDescriptor.ToString, DataDialog.NodeDescriptor.ToString);
cxtextedit3.Text := Value;
end;
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