Initializer

init(data:)

Creates a data provider that reads from a CFData object.

Declaration

init?(data: CFData)

Parameters

data

The CFData object to read from.

Return Value

A new data provider. You are responsible for releasing this object using CGDataProviderRelease.

Discussion

You can use this function when you need to represent Core Graphics data as a CFData type. For example, you might create a CFData object when reading data from the pasteboard.

See Also

Creating Direct-Access Data Providers

init?(url: CFURL)

Creates a direct-access data provider that uses a URL to supply data.

init?(filename: UnsafePointer<Int8>)

Creates a direct-access data provider that uses a file to supply data.

struct CGDataProviderDirectCallbacks

Defines pointers to client-defined callback functions that manage the sending of data for a direct-access data provider.

typealias CGDataProviderGetBytePointerCallback

A callback function that returns a generic pointer to the provider data.

typealias CGDataProviderGetBytesAtPositionCallback

A callback function that copies data from the provider into a Core Graphics buffer.

typealias CGDataProviderReleaseBytePointerCallback

A callback function that releases the pointer Core Graphics obtained by calling CGDataProviderGetBytePointerCallback.

typealias CGDataProviderReleaseInfoCallback

A callback function that releases any private data or resources associated with the data provider.

typealias CGDataProviderReleaseDataCallback

A callback function that releases data you supply to the function init(dataInfo:data:size:releaseData:).

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software