ABRecordCopyValue可以返回什么？ （解决不良访问） [英] What ABRecordCopyValue can return? (solving a bad access)

问题描述

我正在使用这个简单的代码来获取ios 7中地址簿的所有联系人。我的地址中有155个联系人。当我记录人们的姓名时，我从我的地址簿中获取了34个正确的名字（显然是随机的），15个名称为null，然后在第50个项目上有一个糟糕的访问崩溃

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)

我尝试了loggin surname，或者图片没有变化。我试图避免在null对象上进行ABRecordCopyValue而不进行任何更改。我尝试在项目> 50上执行ABRecordCopyValue，并在50到150的项目上得到相同的结果。我做错了什么？什么ABRecordCopyValue可以返回正确的值并且为空？

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);
    }
}

推荐答案

我想 ^{（我其实很确定）}问题是 nPeople 是错误的值并且不匹配 allPeople 数组中的条目数，就像你想象的那样。当 CFArray 已经提供了直接的方法时，你使用了一种奇怪的方法来获取 nPeople 。

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.

我认为这样可行：

CFIndex nPeople = CFArrayGetCount(allPeople);

此外，您需要检查 person 是否为非 - NULL 使用前：

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

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

这篇关于ABRecordCopyValue可以返回什么？ （解决不良访问）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！