---
title: VNDetectBarcodesRequest
framework: vision
role: symbol
role_heading: Class
path: vision/vndetectbarcodesrequest
---

# VNDetectBarcodesRequest

A request that detects barcodes in an image.

## Declaration

```swift
class VNDetectBarcodesRequest
```

## Overview

Overview This request returns an array of VNBarcodeObservation objects, one for each barcode it detects.

## Topics

### Specifying Symbologies

- [supportedSymbologies()](vision/vndetectbarcodesrequest/supportedsymbologies().md)
- [symbologies](vision/vndetectbarcodesrequest/symbologies.md)
- [coalesceCompositeSymbologies](vision/vndetectbarcodesrequest/coalescecompositesymbologies.md)
- [VNBarcodeSymbology](vision/vnbarcodesymbology.md)
- [supportedSymbologies](vision/vndetectbarcodesrequest/supportedsymbologies.md)

### Accessing the Results

- [results](vision/vndetectbarcodesrequest/results.md)
- [VNBarcodeObservation](vision/vnbarcodeobservation.md)

### Identifying Request Revisions

- [VNDetectBarcodesRequestRevision3](vision/vndetectbarcodesrequestrevision3.md)
- [VNDetectBarcodesRequestRevision2](vision/vndetectbarcodesrequestrevision2.md)
- [VNDetectBarcodesRequestRevision1](vision/vndetectbarcodesrequestrevision1.md)

## Relationships

### Inherits From

- [VNImageBasedRequest](vision/vnimagebasedrequest.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Barcode detection

- [VNBarcodeCompositeType](vision/vnbarcodecompositetype.md)