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# CGDataConsumerCallbacks

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

```
struct CGDataConsumerCallbacks
```

## Overview

The functions specified by the `CGDataConsumerCallbacks` structure are responsible for copying data that Core Graphics sends to your consumer and for handling the consumer’s basic memory management. You supply this structure to the function [`init(info:cbks:)`](/documentation/CoreGraphics/CGDataConsumer/init(info:cbks:)) to create a data consumer.

## Topics

### Initializers

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

[`init(putBytes:releaseConsumer:)`](/documentation/CoreGraphics/CGDataConsumerCallbacks/init(putBytes:releaseConsumer:))

### Instance Properties

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

A pointer to a function that copies data to the data consumer. For more information, see [`CGDataConsumerPutBytesCallback`](/documentation/CoreGraphics/CGDataConsumerPutBytesCallback).

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

A pointer to a function that handles clean-up for the data consumer, or `NULL`.


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