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数据格式化程序暂时不可用,将在“继续”后重试

fullcontact memory-management iphone

amehta · 技术社区 · 15 年前

ContactsWithPN - start loop
Program received signal:  â0â.
Data Formatters temporarily unavailable, will re-try after a 'continue'. (Unknown error loading shared library "/Developer/usr/lib/libXcodeDebuggerSupport.dylib")

以下是导致此问题的代码:

+(NSArray *) contactsWithPhoneNumbers{
    NSArray *contacts = [ABContactsHelper contacts];
    NSMutableArray *rv = [[NSMutableArray alloc] init];
    NSLog(@"ContactsWithPN - start loop");
    for (int i = 0; i< [contacts count] ; i++) {
        ABContact * c = (ABContact*)[contacts objectAtIndex:i];
        ABContact * fullContact = [ABContact  contactWithRecordID:[c recordID]];

        if ([[fullContact phoneArray] count] > 0) {
            [rv addObject:fullContact];
        }
    }
    NSLog(@"ContactsWithPN - end loop");
    NSArray *ret = [[NSArray alloc] initWithArray:rv];
    return ret;
}

在调用上述类方法的视图控制器中,我添加了以下代码以查看是否发送了内存警告。他们不是!

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    NSLog(@"InviteFriends - memory warning received");
}

观察: +发现错误发生在不同的时间点——有时在索引253处,有时在索引246处。。 +只发生在IPhone上-不发生在模拟器上(在模拟器上,有<5个联系人)

4 回复 | 直到 12 年前

tc. 15 年前

相反,可以考虑查看电话控制台(Xcode->Organizer->Your phone->console,或iPCU中的等效控制台)。如果它说“内存级别很关键”之类的话,并提到要关闭你的应用程序,那么你的内存就用完了。此外,当内存不足时,crash reporter会在被终止的进程旁边写一个“内存不足”的崩溃日志,并带有“丢弃”字样;您应该在管理器中看到这些内容。(由于iOS4的“多任务”功能,抛弃也会发生在后台任务上。)

for (int i = 0; i< [contacts count] ; i++) {
    NSAutoreleasePool * pool = [NSAutoreleasePool new];

    ...

    [pool drain]; pool = nil;
}

你的代码也会泄露 ret 和 rv .

Henrik P. Hessel 15 年前

当应用程序内存不足时会发生此错误。你应该读书 Apples Memory Management Guide

fzaziz Danish 14 年前

第一件事是你的代码有内存泄漏。。。像这样修理

+(NSArray *) contactsWithPhoneNumbers{
    NSArray *contacts = [ABContactsHelper contacts];
    NSMutableArray *rv = [[NSMutableArray alloc] init];

    NSLog(@"ContactsWithPN - start loop");
    for (int i = 0; i< [contacts count] ; i++) {
        ABContact * c = (ABContact*)[contacts objectAtIndex:i];
        ABContact * fullContact = [ABContact  contactWithRecordID:[c recordID]];

        if ([[fullContact phoneArray] count] > 0) {
            [rv addObject:fullContact];
        }
    }

    NSLog(@"ContactsWithPN - end loop");
    NSArray *ret = [[NSArray alloc] initWithArray:rv];
    //You need to release rv since you dont need it any more as you have copied the contents to a new array ( this itself is a waste ) so you must release the old array
    [rv release];

    //Now when you return the array you must still not hold object ownership since the function dies after returning so you give it a delayed release which kicks in when the autorelease is flushed.
    return [ret autorelease];
}

通常情况下,自动释放在操作系统决定的特定时间刷新,但是您可以创建自己的池以确保不会浪费资源。所以你最好这样打电话

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSArray *contactArray = [[self contactsWithPhoneNumbers] retain];
[pool drain];
//This will release the object ownership held by the function

最后,你这样做,你没有内存泄漏,但你仍然得到这个错误。答案是因为记忆警告并没有像@tc那样对你产生影响。他说。所以简单的答案是主运行回路堵塞了。你可以做的是在一个单独的线程中执行这个操作,以确保主循环没有阻塞。。。如果你在iOS4+上,你可以通过

dispatch_queue_t otherQueue = dispatch_queue_create("com.company.otherqueue", NULL);
dispatch_async(otherQueue, ^{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSArray *contactArray = [[self contactsWithPhoneNumbers] retain];
    [pool drain];
}
dispatch_release(otherQueue);

现在这不一定意味着它将创建一个新线程,但是操作系统将管理队列,这样主队列就不会被阻塞,并且您将收到内存警告。从那时起,你必须释放记忆,并确保你不去了。

Sviatoslav Yakymiv 10 年前

我发现ABContact也会泄漏内存,请参阅下面的ABContactHelper部分代码。

+ (NSArray *) contacts
{
 ABAddressBookRef addressBook = ABAddressBookCreate();
 NSArray *thePeople = (NSArray *)ABAddressBookCopyArrayOfAllPeople(addressBook);
 NSMutableArray *array = [NSMutableArray arrayWithCapacity:thePeople.count];
 for (id person in thePeople)
 {
  [array addObject:[ABContact contactWithRecord:(ABRecordRef)person]];
 }
 [thePeople release];
        //I think need CFRelease(addressBook); here
 return array;
}