ABAddressBook

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http://developer.apple.com/iphone/library/documentation/ContactData/Conceptual/AddressBookProgrammingGuideforiPhone/500-DirectInteraction/DirectInteraction.html#//apple_ref/doc/uid/TP40007744-CH6-SW1

Read person record:

ABAddressBookRef addressBook = ABAddressBookCreate();

CFArrayRef people = ABAddressBookCopyArrayOfAllPeople(addressBook);

CFMutableArrayRef peopleMutable = CFArrayCreateMutableCopy(

                                          kCFAllocatorDefault,

                                          CFArrayGetCount(people),

                                          people

);

[peopleMutable sortUsingFunction:ABPersonComparePeopleByName

                         context:(void*)sortOrdering];

/* the equivalent in Procedural C:

 CFArraySortValues (

        peopleMutable,

        CFRangeMake(0, CFArrayGetCount(peopleMutable)),

        (CFComparatorFunction)ABPersonComparePeopleByName,

        (void*)ABPersonGetSortOrdering()

);

*/

CFRelease(addressBook);

CFRelease(people);

CFRelease(peopleMutable);