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# CGDataConsumer

An abstraction for data-writing tasks that eliminates the need to manage a raw memory buffer.

```
class CGDataConsumer
```

## Overview

Most apps should use <doc://com.apple.documentation/documentation/ImageIO/CGImageDestination> objects instead.

## Topics

### Creating Data Consumers

[`init(info:cbks:)`](/documentation/CoreGraphics/CGDataConsumer/init(info:cbks:))

Creates a data consumer that uses callback functions to write data.

[`init(url:)`](/documentation/CoreGraphics/CGDataConsumer/init(url:))

Creates a data consumer that writes data to a location specified by a URL.

[`init(data:)`](/documentation/CoreGraphics/CGDataConsumer/init(data:))

Creates a data consumer that writes to a CFData object.

[`CGDataConsumerCallbacks`](/documentation/CoreGraphics/CGDataConsumerCallbacks)

A structure that contains pointers to callback functions that manage the copying of data for a data consumer.

[`CGDataConsumerPutBytesCallback`](/documentation/CoreGraphics/CGDataConsumerPutBytesCallback)

Copies data from a Core Graphics-supplied buffer into a data consumer.

[`CGDataConsumerReleaseInfoCallback`](/documentation/CoreGraphics/CGDataConsumerReleaseInfoCallback)

Releases any private data or resources associated with the data consumer.

### Retaining and Releasing Data Consumers

[`CGDataConsumerRelease`](/documentation/CoreGraphics/CGDataConsumerRelease)

Decrements the retain count of a data consumer.

[`CGDataConsumerRetain`](/documentation/CoreGraphics/CGDataConsumerRetain)

Increments the retain count of a data consumer.

### Working with Core Foundation Types

[`typeID`](/documentation/CoreGraphics/CGDataConsumer/typeID)

Returns the Core Foundation type identifier for Core Graphics data consumers.

## See Also

  [Quartz 2D Programming Guide](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/Introduction/Introduction.html#//apple_ref/doc/uid/TP30001066)


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