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  "title" : "C Types"
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# C Types

Identify the C types that correspond to Address Book objects.

## Topics

### Essentials

[`typealias ABAddressBook`](/documentation/AddressBook/ABAddressBook-swift.typealias)

A reference to an ABAddressBook object.

### Data Types

[`class ABPersonRef`](/documentation/AddressBook/ABPersonRef)

A reference to an ABPerson object.

[`class ABGroupRef`](/documentation/AddressBook/ABGroupRef)

A reference to an ABGroup object.

[`typealias ABMultiValue`](/documentation/AddressBook/ABMultiValue-swift.typealias)

A reference to an `ABMultiValue` or `ABMutableMultiValueobject`.

[`typealias ABMutableMultiValue`](/documentation/AddressBook/ABMutableMultiValue-swift.typealias)

A reference to an ABMutableMultiValue object.

### Pickers

[`typedef struct OpaqueABPicker * ABPickerRef;`](/documentation/AddressBook/ABPickerRef)

A reference to an ABPicker object.

### Action Plug-In

[`typedef struct { ... } ABActionCallbacks;`](/documentation/AddressBook/ABActionCallbacks)

This is the structure that the `ABActionRegisterCallbacks` returns to tell Address Book about the action the plug-in implements.

### Deprecated

[`struct ABPersonImageFormat`](/documentation/AddressBook/ABPersonImageFormat)

Indicates an image format.


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