ua.client.uaStrToNodeId

Converts a string to a NodeId object.

Delphi

function uaStrToNodeId(Source: string): uaNodeId;

C++

uaNodeId uaStrToNodeId(AnsiString Source);

Description

In OPC UA, every entity in the address space is a unique node.

Each node has a NodeId object, which is has 3 properties:

Property
NamespaceIndex	The namespace index as a number. Default is 0.
IdentifierType	The data type of the identifier. Default is string
Identifier	The identifier for a node.

Following Identifier types are supported:

IdentifierType	character
number	i
string	s
globally unique identifier (GUID)	g
opaque value (ByteString)	b

To convert a string to a NodeId object you have to use following format:

ns=<NamespaceIndex>;<IdentifierType>=<Identifier>

Examples:

ns=2;s=MyTemperature // namespace index 2, string identifier

i=2045 // namespace index 0, numeric identifier

G.OPCItems.AddItem('ns=0;i=2256'); // NodeId with IdentifierType i = number and NamespaceIndex = 0 (default)

G.OPCItems.AddItem('ns=5;s=Random1'); // NodeId with IdentifierType s = string (default) and NamespaceIndex = 5