What ABRecordCopyValue can return? (solving a bad access)

问题

I'm using this simple code to get all contacts of the address book in ios 7. I have 155 contacts in my address. When i log people firstNames i obtain 34 correct names picked (apparently randomly) from my address book, 15 names null and then on item 50 a bad access crash on line

   NSString *firstNames = (__bridge NSString*)ABRecordCopyValue(person, kABPersonFirstNameProperty)

I tried loggin surname, or image getting no changes. I tried to avoid doing ABRecordCopyValue on null object getting no changes. I tried to execute ABRecordCopyValue on item >50 and got the same result on items from 50 to 150. What i'm doing wrong? What ABRecordCopyValue can return beside correct values and null?

+(NSArray *)getAllContactsAddress
{
CFErrorRef *error = nil;
ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);

// SUPPOSE access has been granted
BOOL accessGranted = true;

if (accessGranted) {
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);
    ABRecordRef source = ABAddressBookCopyDefaultSource(addressBook);
    CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering(addressBook, source, kABPersonSortByFirstName);
    CFIndex nPeople = ABAddressBookGetPersonCount(addressBook);
    NSMutableArray* items = [NSMutableArray arrayWithCapacity:nPeople];


    for (int i = 0; i < nPeople; i++)
    {
        ContactsData *contacts = [ContactsData new];

        ABRecordRef person = CFArrayGetValueAtIndex(allPeople, i);

        NSString *firstNames = (__bridge NSString*)ABRecordCopyValue(person, kABPersonFirstNameProperty);

        NSLog(@"%@",firstNames);
    }
}

回答1:

I think ^{(I'm actually pretty sure)} the issue is that nPeople is the wrong value and doesn't match the number of entries in the allPeople array, like you assume it does. You have used a strange method of getting nPeople when CFArray already provides a straight-forward method.

I reckon this will work:

CFIndex nPeople = CFArrayGetCount(allPeople);

Also you need to check if person is non-NULL before using it:

ABRecordRef person = CFArrayGetValueAtIndex(allPeople, i);
NSAssert(person, @"Non-person detected!");

来源：https://stackoverflow.com/questions/24651715/what-abrecordcopyvalue-can-return-solving-a-bad-access

标签

ios

addressbook

abrecord