objective-c – 从NSString调试EXC_BAD_ACCESS_app

概述我的控制台中有一条EXC_BAD_ACCESS消息.我在 this site上读到了环境变量NSZombieEnabled和MallocStackLoggingNoCompact.我创建了我的环境变量：NSZombieEnabled = YES和MallocStackLoggingNoCompact = 1.在控制台中,我看到了 2010-03-01 19:13:46.924 CruzNomad[ 我的控制台中有一条EXC_BAD_ACCESS消息.我在 this site上读到了环境变量NSZombIEEnabled和MallocStackLoggingNoCompact.我创建了我的环境变量：NSZombIEEnabled = YES和MallocStackLoggingNoCompact = 1.在控制台中,我看到了

2010-03-01 19:13:46.924
CruzNomad[7952:207] *** -[CFString
stringByAddingPercentEscapesUsingEnCoding:]:
message sent to deallocated instance
0x58448e0

然后在(gdb)提示符下,我做了信息malloc-history 0x58448e0,它给了我：

Alloc: Block address: 0x058448e0 length: 64Stack - pthread: 0xa0b33500 number of frames: 25    0: 0x98e089bc in malloc_zone_malloc    1: 0x21516aa in _CFRuntimeCreateInstance    2: 0x2152bf8 in __CFStringCreateImmutableFunnel3    3: 0x21567d9 in CFStringCreatecopy    4: 0x21742fc in _CFStringCreateWithFormatandArgumentsAux    5: 0xdb546 in -[NSPlaceholderString initWithFormat:locale:arguments:]    6: 0xdb4d8 in +[Nsstring stringWithFormat:]    7: 0x23aa3 in -[BuisnessCardVIEwController vIEwDIDLoad] at /Users/.../Classes/BuisnessCardVIEwController.m:85    8: 0x3d6796 in -[UIVIEwController vIEw]    9: 0x347b4 in -[gm_menuVIEwController btn5_pressed:] at /Users/.../Classes/menuVIEwController.m:535   10: 0x357459 in -[UIApplication sendAction:to:from:forEvent:]   11: 0x3baba2 in -[UIControl sendAction:to:forEvent:]   12: 0x3bcdc3 in -[UIControl(Internal) _sendActionsForEvents:withEvent:]   13: 0x3bbb0f in -[UIControl touchesEnded:withEvent:]   14: 0x370e33 in -[UIWindow _sendtouchesForEvent:]   15: 0x35a81c in -[UIApplication sendEvent:]   16: 0x3610b5 in _UIApplicationHandleEvent   17: 0x2984ed1 in PurpleEventCallback   18: 0x2197b80 in CFRunLoopRunspecific   19: 0x2196c48 in CFRunLoopRunInMode   20: 0x298378d in GSEventRunModal   21: 0x2983852 in GSEventRun   22: 0x362003 in UIApplicationMain   23: 0x2c8c in main at /Users/.../source/main.m:14   24: 0x2bfa in start

第7行说问题出现在BuisnessCardVIEwController.m的第85行.那条线在这里：

fullAddress = [Nsstring stringWithFormat:@"%@ %@",fullAddress,myString];

我将附加fullAddress和myString的内容并将其存储在fullAddress中.

如果我正确地解释了这一点,那么看起来在此行之后,fullAddress被释放.当我删除断点并将鼠标悬停在变量上时,其值显示“超出范围”.

fullAddress稍后在此方法中工作.我使用它发送给谷歌,以便在相同方法的第164行中进行反向地理编码.

Nsstring    *urlString = [Nsstring stringWithFormat:@"http://maps.Google.com/maps/geo?q=%@&output=csv",[fullAddress stringByAddingPercentEscapesUsingEnCoding:NSUTF8StringEnCoding]];

即使在这里,它也说“超出范围”.我很难过……任何建议？

谢谢！

托马斯

解决方法在大多数情况下,当您不保留属性为对象并在其他方法中向其发送延迟消息时,会发生这种情况.

所以,在初始化一些字符串的地方尝试：