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# AVMetadataMachineReadableCodeObject

Barcode information detected by a metadata capture output.

```
class AVMetadataMachineReadableCodeObject
```

## Overview

The `AVMetadataMachineReadableCodeObject` class is a concrete subclass of [`AVMetadataObject`](/documentation/AVFoundation/AVMetadataObject) defining the features of a detected one-dimensional or two-dimensional barcode.

An `AVMetadataMachineReadableCodeObject` instance represents a single detected machine readable code in an image.  It’s an immutable object describing the features and payload of a barcode.

On supported platforms, the [`AVCaptureMetadataOutput`](/documentation/AVFoundation/AVCaptureMetadataOutput) class outputs arrays of detected machine readable code objects.

## Topics

### Getting machine-readable code values

[`corners`](/documentation/AVFoundation/AVMetadataMachineReadableCodeObject/corners-58qbe)

A Swift array of corner points.

[`corners`](/documentation/AVFoundation/AVMetadataMachineReadableCodeObject/corners-8f6bv)

The points defining the (x, 	y) locations of the corners.

[`descriptor`](/documentation/AVFoundation/AVMetadataMachineReadableCodeObject/descriptor)

A barcode description for use in Core Image.

[`stringValue`](/documentation/AVFoundation/AVMetadataMachineReadableCodeObject/stringValue)

Returns the error-corrected data decoded into a human-readable string.

### Constants

[Machine-readable object types](/documentation/AVFoundation/machine-readable-object-types)

Constants used to specify the type of barcode to scan.


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