Skip to main content Skip to search

Table of Contents

LabVIEW User Manual
LabVIEW Overview
LabVIEW New Features and Changes
Upgrading LabVIEW
Finding Your Way in LabVIEW
Examples, VI Templates, Project Templates, and Sample Projects
Installing LabVIEW
LabVIEW Concepts
LabVIEW How To
- LabVIEW How To
  - Setting up LabVIEW
  - Creating your project
  - Customizing LabVIEW
  - Customizing your Palette
  - Source Controls with LabVIEW
  - LabVIEW Classes
  - Block Diagrams
  - Searching Options in LabVIEW
  - LabVIEW Misc
  - VIs
  - Objects
  - Controls and Indicators
  - Arrays and Clusters
  - Matrices
  - Formula Nodes, Expression Nodes, and Script Nodes
  - Variables
    - Read and Write Variables
    - Local Variables
    - Global Variables
    - Shared Variables
  - Numeric Data
  - Comparing functions in LabVIEW
  - Showing and Hiding Labels and Digital Displays
  - Importing Background Images for Panes
  - Importing Graphics on Linux
  - Importing Graphics on macOS
  - Importing Graphics on Windows
  - Editing the Labels of Buttons
  - Graphs and Charts
  - Changing the Numeric Representation of a Waveform
  - Acquiring or Simulating a Signal
  - Analyzing a Signal
  - Displaying a Signal
  - Filtering a Signal
  - Merging Signals
  - Splitting Signals
  - Instrument Driver Modification Instructions
  - Creating Instrument Driver Projects
  - Creating Instrument Driver VIs
  - Displaying Pixels Not Visible in a 2D Picture Control
  - Resetting 2D Picture Controls
  - Using Sound Input and Sound Output Devices
  - Creating a 3D Scene with the 3D Picture Control
  - Configuring a Camera for a 3D Scene
  - Configuring a Light Source for a 3D Scene
  - Changing the Surface Appearance of a 3D Object
  - Creating Relationships between 3D Objects
  - Adding Text to a 3D Scene
  - Configuring a 3D Scene Window
  - Changing the Mechanical Action of a Boolean Object
  - Configuring a Mixed Checkbox
  - Creating a Radio Buttons Control
  - Creating and Operating Boolean Controls and Indicators
  - Building Digital Tables
  - Listboxes, Tree Controls, and Tables
  - Structures
  - Loops
  - Subdiagram and Case Structures
  - Events
  - Strings
  - Adding Color Ramps to Dials, Knobs, and Gauges
  - Adding Sliders or Needles
  - Adding Text Labels to Numeric Objects with Scale
  - Changing Scale Limits
  - Changing Scrolling Ranges of Scroll Bar Controls
  - Characters Numeric Controls and Indicators Accept
  - Configuring the Time and Date in a Time Stamp Control
  - Displaying Higher Digits of Precision in a Time Stamp Control
  - Placing Arbitrary Markers on Scales
  - Scaling Slide and Rotary Controls and Indicators
  - Using Scroll Bar Controls
  - Using the Increment and Decrement Buttons
  - Valid Format Specifiers for Numeric Data Types
  - Empty Paths
  - Symbolic Paths
  - Display Options
  - Creating Type Definitions and Strict Type Definitions
  - Editing Saved Type Definitions and Saved Strict Type Definitions
  - Manually Updating Type Definition Instances
  - Reestablishing the Link to a Type Definition or Strict Type Definition
  - SubVI and Express VI
  - Terminals
  - Selecting a Connector Pane Pattern
  - Setting Required, Recommended, and Optional Inputs and Outputs
  - Icons
  - Menus
  - Troubleshooting
  - Documenting in LabVIEW
  - Printing in LabVIEW
  - Reports in LabVIEW
  - Adding New Exported VIs Entries
  - Editing Existing Exported VIs Entries
  - Removing VIs from the Exported VIs List
  - Adding New Machine Access List Entries
  - Editing Existing Machine Access List Entries
  - Removing Machine Access List Entries
  - Setting Machine Access for the VI Server
  - Removing Browser Access List Entries
  - Calling Shared Libraries in LabVIEW
  - Building a Function Prototype
  - Completing the.c File
  - Importing Functions from a Shared Library File
  - Example: Importing Functions from a Shared Library File
  - Troubleshooting the Import Shared Library Wizard
  - Using the Flatten To String Function
  - Creating Dotted Properties and Methods
  - Creating Properties and Methods
  - Creating Properties and Methods with the Class Browser Window
  - Registering and Handling.NET Framework and ActiveX Events
  - Creating.NET Controls in a.NET Container
  - Creating.NET Objects on the Block Diagram
  - Using Static .NET Properties and Methods
  - Loading .NET Framework 2.0, 3.0, and 3.5 Assemblies in LabVIEW
  - Loading Changes to a .NET Framework Assembly in Memory
  - Specifying Which Version of a .NET Assembly to Use
  - Debugging Calls to.NET Framework Assemblies
  - ActiveX
  - Editing Existing Property and Invoke Nodes
  - Linking Property Nodes and Invoke Nodes to Terminals
  - Connectivity in LabVIEW
LabVIEW Measurement Concepts
LabVIEW Shared Libraries
Signal Processing and Analysis
Accessing Scanned I/O Data
PID and Fuzzy Logic
Distributed System Manager Overview

Product DocumentationLabVIEW User Manual...LabVIEW How ToReading the Value of a Variable

Table of Contents

Reading the Value of a Variable

Download PDF

Updated2025-04-01
1 minute(s) read

Required permission: VariableRead

To read the value of a shared variable, you must read the VariableValue. To read a VariableValue, use the following URI format:

GET http://[host]:[port]/nivariable/VariableValues('[dynamic api url]')

For example, use the following URI to read the value of ni.var.psp://localhost/hvac/t01 :

GET http://my_server:3580/nivariable/VariableValues('ni.var.psp://localhost/hvac/t01')?$format=json

Note In the JSON response, the timestamp is represented as milliseconds after 1970/1/1 0:0:0, UTC time.

To read the value property without the timestamp, use the following URI:

GET http://my_server:3580/nivariable/VariableValues('ni.var.psp://localhost/hvac/t01')/Value?$format=json

Was this information helpful?

Previous

Finding Out Basic Information about a Shared Variable

Next

Writing to a Variable

Previous

Finding Out Basic Information about a Shared Variable

Next

Writing to a Variable

Log in to get a better experience