Interface ClientSessionDataTypeService

getBuiltInDataType

• getBuiltInDataType(nodeId: NodeId): Promise<DataType>
• getBuiltInDataType(nodeId: NodeId, callback: (err: Error, dataType?: DataType) => void): void

• retrieve the built-in DataType of a Variable, from its DataType attribute.

  this method is useful to determine which DataType to use when constructing a Variant

  async

  example

  const session = ...; // ClientSession
  const nodeId = opcua.VariableIds.Server_ServerStatus_CurrentTime;
  session.getBuiltInDataType(nodeId,function(err,dataType) {
    assert(dataType === opcua.DataType.DateTime);
  });
  // or
  nodeId = opcua.coerceNodeId("ns=2;s=Static_Scalar_ImagePNG");
  const dataType: await session.getBuiltInDataType(nodeId);
  assert(dataType === opcua.DataType.ByteString);
  

  Parameters

  • nodeId: NodeId

    the node id of the variable to query

  Returns Promise<DataType>

• Parameters

  • nodeId: NodeId

  • callback: (err: Error, dataType?: DataType) => void

    • • (err: Error, dataType?: DataType): void

      • Parameters

        • err: Error

        • Optional dataType: DataType

        Returns void

  Returns void