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


init?(filename: UnsafePointer<Int8>)



The full or relative pathname to use for the data provider. When you supply Core Graphics data via the provider, it reads the data from the specified file.

Return Value

A new data provider or NULL if the file could not be opened. You are responsible for releasing this object using CGDataProviderRelease.


You use this function to create a direct-access data provider that supplies data from a file. When you supply Core Graphics with a direct-access data provider, Core Graphics obtains data from your program in a single block.

See Also

Creating Direct-Access Data Providers

init?(data: CFData)

Creates a data provider that reads from a CFData object.

init?(url: CFURL)

Creates a direct-access data provider that uses a URL 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:).

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