Struct TagValue 

pub struct TagValue {
    pub tag_id: String,
    pub value: String,
    pub quality: String,
    pub timestamp: String,
}

A single tag’s read result.

Returned by OpcProvider::read_tag_values and OpcProvider::read_tag_values_for_display.

Examples

use opc_da_client::TagValue;

let tv = TagValue {
    tag_id: "Simulation.Random.1".to_string(),
    value: "42.5".to_string(),
    quality: "Good".to_string(),
    timestamp: "2026-01-01 00:00:00".to_string(),
};
assert_eq!(tv.tag_id, "Simulation.Random.1");

Fields

tag_id: String

The fully qualified tag identifier (e.g., "Channel1.Device1.Tag1").

value: String

The current value as a string representation.

OpcProvider::read_tag_values preserves VT_BSTR contents exactly. OpcProvider::read_tag_values_for_display may add presentation quotes around BSTR values.

quality: String

OPC quality indicator (e.g., "Good", "Bad", or "Uncertain").

timestamp: String

Timestamp of the last value change, formatted as a local time string.

Trait Implementations

impl Clone for TagValue

fn clone(&self) -> TagValue

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TagValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for TagValue

impl PartialEq for TagValue

fn eq(&self, other: &TagValue) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TagValue