iPhone SDK：带CFRelease的EXC_BAD_ACCESS用于ABAddressBookRef

Question

我的代码有非常奇怪的错误..实际上，根本没有错误，只是调试器以“程序接收到的信号：”EXC_BAD_ACCESS“”消息开始。 任何人都可以帮助我吗？我非常困惑......谢谢。

-(NSString *)fullNameForPhone:(NSString *)ph withAlternativeText:(NSString *)text 
{ 
    ABAddressBookRef addressBookRef = ABAddressBookCreate(); 
    NSLog(@"create addressBookRef"); 
    NSString *stringToReturn = text; 

    CFArrayRef allPeopleRef = ABAddressBookCopyArrayOfAllPeople(addressBookRef); 
    NSLog(@"create allPeopleRef"); 
    CFIndex nPeople = ABAddressBookGetPersonCount(addressBookRef); 

    int i = 0; 
    BOOL nameFound = NO; 

    while ((i < nPeople) && (!nameFound)) 
    { 
     ABRecordRef recordRef = CFArrayGetValueAtIndex(allPeopleRef, i); 
     NSLog(@" create recordRef"); 
     CFStringRef allRecordPhonesRef = ABRecordCopyValue(recordRef, kABPersonPhoneProperty); 
     NSLog(@" create allRecordPhonesRef"); 
     CFIndex nPhones = ABMultiValueGetCount(allRecordPhonesRef); 
     int currentPhone = 0; 
     for (currentPhone = 0; currentPhone < nPhones; currentPhone++) 
     { 
      CFStringRef currentPhoneNumberRef = ABMultiValueCopyValueAtIndex(allRecordPhonesRef, currentPhone); 
      NSLog(@"   create currentPhoneNumberRef"); 
      NSString *currentCleanPhoneNumber = [self cleanPhoneNumberForString:[NSString stringWithFormat:@"%@", currentPhoneNumberRef]]; 
      if (currentPhoneNumberRef!=NULL) 
      { 
       NSLog(@"   release currentPhoneNumberRef"); 
       CFRelease(currentPhoneNumberRef); 
      } 

      if ([ph isEqualToString:currentCleanPhoneNumber]) 
      { 
       CFStringRef firstName = ABRecordCopyValue(recordRef, kABPersonFirstNameProperty); 
       CFStringRef lastName = ABRecordCopyValue(recordRef, kABPersonLastNameProperty); 
       NSString *fullName = [self fullNameForFirstName:[NSString stringWithFormat:@"%@", firstName] 
                andLastName:[NSString stringWithFormat:@"%@", lastName]]; 
       if (firstName != NULL) 
        CFRelease(firstName); 
       if (lastName != NULL) 
        CFRelease(lastName); 
       stringToReturn = fullName; 
       nameFound = YES; 
       break; 
      } 

     } 

     CFRelease(allRecordPhonesRef); 
     NSLog(@" release allRecordPhonesRef"); 
     CFRelease(recordRef); 
     NSLog(@" release recordRef"); 
     i++; 
    } 
    CFRelease(allPeopleRef); 
    NSLog(@"release allPeopleRef"); 
    CFRelease(addressBookRef); 
    NSLog(@"release addressBookRef"); 
    return stringToReturn; 
} 

控制台输出是：

2009-07-31 00:20:05.230 abmodular[21747:20b] create addressBookRef 
2009-07-31 00:20:05.231 abmodular[21747:20b] create allPeopleRef 
2009-07-31 00:20:05.231 abmodular[21747:20b] create recordRef 
2009-07-31 00:20:05.232 abmodular[21747:20b] create allRecordPhonesRef 
2009-07-31 00:20:05.232 abmodular[21747:20b]   create currentPhoneNumberRef 
2009-07-31 00:20:05.232 abmodular[21747:20b]   release currentPhoneNumberRef 
2009-07-31 00:20:05.232 abmodular[21747:20b]   create currentPhoneNumberRef 
2009-07-31 00:20:05.233 abmodular[21747:20b]   release currentPhoneNumberRef 
2009-07-31 00:20:05.233 abmodular[21747:20b] release allRecordPhonesRef 
2009-07-31 00:20:05.233 abmodular[21747:20b] release recordRef 
2009-07-31 00:20:05.233 abmodular[21747:20b] create recordRef 
2009-07-31 00:20:05.234 abmodular[21747:20b] create allRecordPhonesRef 
2009-07-31 00:20:05.234 abmodular[21747:20b]   create currentPhoneNumberRef 
2009-07-31 00:20:05.234 abmodular[21747:20b]   release currentPhoneNumberRef 
2009-07-31 00:20:05.234 abmodular[21747:20b] release allRecordPhonesRef 
2009-07-31 00:20:05.235 abmodular[21747:20b] release recordRef 
2009-07-31 00:20:05.235 abmodular[21747:20b] release allPeopleRef 
[Session started at 2009-07-31 00:20:05 +0400.] 
GNU gdb 6.3.50-20050815 (Apple version gdb-966) 
.... 
Attaching to process 21747. 
kill 
quit 
The Debugger has exited with status 0.(gdb) 

按下继续输出 “EXC_BAD_ACCESS” 消息。 Xcode显示，我的代码中最新执行的字符串是CFRelease(addressBookRef);

Answer 1

我有同样的问题做类似的事情和进一步的研究，我发现我过了释放。按照Core Foundation docs：

如果创建或复制核心 Foundation对象，必须 随后释放它，当你 完成它。

我读到，作为含义，功能与单词获取不应该被释放你。如果这样做，当真正的所有者试图释放它时，它会在稍后引起问题。所以，当你做这种情况下：

ABRecordRef recordRef = CFArrayGetValueAtIndex(allPeopleRef, i); 

及更高版本：

CFRelease(recordRef); 

你发布的东西，是不应该被释放。很久以后，当你这样做：

CFRelease(allPeopleRef); 

数组将尝试释放其所有记录，不知道你已经释放了一些人。结果是你的错误。通过评论这一行，你可能会让错误消失，但我担心你已经造成了内存泄漏。

我建议你不要在叫CFRelease获取方法指针，做调用它创建或复制方法指针（可能有例外情况，但到目前为止，它为我的作品）。

Answer 2

allPeopleRef和addressBookRef指向相同的对象？副本可能很浅。 ABAddressBookCopyArrayOfAllPeople是做什么的？