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在学习 iOS 开发时，使用 subdataWithRange:NSMakeRange 遇到一个问题
childs 2015-02-28 09:30:10 +08:00 8522 次点击这是一个创建于 3902 天前的主题，其中的信息可能已经有所发展或是发生改变。
我在加载存到数据库中的pdf文件(大约14M)的二进制数据时，通过
[data appendData:[self.archiveData subdataWithRange:NSMakeRange(self.offset, len)]];加载数据
len是int类型offset是NSInteger类型。
self.offset += len;
但是当self.offset增加到差不多7M左右的时候就会报错。错误如下：
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** NSAllocateMemoryPages(14082573) failed'
*** First throw call stack:
(
0 CoreFoundation 0x06345946 exceptionPreprocess + 182
1 libobjc.A.dylib 0x05fcea97 objc_exception_throw + 44
2 CoreFoundation 0x0634586d +[NSException raise:format:] + 141
3 Foundation 0x04f800ac NSAllocateMemoryPages + 106
4 Foundation 0x04e8e643 _NSDataCreateVMDispatchData + 34
5 Foundation 0x04e8c83a -[_NSPlaceholderData initWithBytes:length:copy:deallocator:] + 252
6 Foundation 0x04e8c72d -[NSData(NSData) initWithBytes:length:copy:freeWhenDone:bytesAreVM:] + 92
7 Foundation 0x04ee9363 -[NSData(NSData) copyWithZone:] + 144
8 CoreFoundation 0x062c4ce9 -[NSCFData copyWithZone:] + 105
9 Foundation 0x04f33531 -[NSSubrangeData initWithData:range:] + 484
10 Foundation 0x04ef3727 -[NSData(NSData) subdataWithRange:] + 657
11 ESPTablet 0x00edf137 -[CWHessianUnarchiver(Private) readDataWithTag:] + 189
12 ESPTablet 0x00edf1b3 -[CWHessianUnarchiver(Private) readDataWithTag:] + 313
13 ESPTablet 0x00edf1b3 -[CWHessianUnarchiver(Private) readDataWithTag:] + 313
14 ESPTablet 0x00edf1b3 -[CWHessianUnarchiver(Private) readDataWithTag:] + 313
15 ESPTablet 0x00edf1b3 -[CWHessianUnarchiver(Private) readDataWithTag:] + 313
16 ESPTablet 0x00edf1b3 -[CWHessianUnarchiver(Private) readDataWithTag:] + 313
17 ESPTablet 0x00edf1b3 -[CWHessianUnarchiver(Private) readDataWithTag:] + 313
。。。。错误还有很多没有全贴出来
这个错误好像是分配内存失败了
请教各位大神，知道这是什么原因吗？
7 条回复 2015-03-01 01:41:52 +08:00
 | 1 keithellis 2015-02-28 09:59:49 +08:00 内存泄露吧 |
 | 2 hyzjshwo  1 恩 没有更多代码 我赌你是内存分配过大，中间产生的内存超过栈的上限了。。。要么修改栈大小，要么控制产生的临时内存空间。 |
 | 3 flicker317 2015-02-28 10:20:38 +08:00 @hyzjshwo 应该是堆吧 |
| 4 hyzjshwo 2015-02-28 10:23:15 +08:00 @flicker317 那要看他具体代码了 |
 | 5 childs OP @hyzjshwo ESPTablet[8934:184080] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** NSAllocateMemoryPages(14082573) failed' *** First throw call stack: ( 0 CoreFoundation 0x063b9946 __exceptionPreprocess + 182 1 libobjc.A.dylib 0x06042a97 objc_exception_throw + 44 2 CoreFoundation 0x063b986d +[NSException raise:format:] + 141 3 Foundation 0x04ff40ac NSAllocateMemoryPages + 106 4 Foundation 0x04f02643 _NSDataCreateVMDispatchData + 34 5 Foundation 0x04f0083a -[_NSPlaceholderData initWithBytes:length:copy:deallocator:] + 252 6 Foundation 0x04f0072d -[NSData(NSData) initWithBytes:length:copy:freeWhenDone:bytesAreVM:] + 92 7 Foundation 0x04f5d363 -[NSData(NSData) copyWithZone:] + 144 8 CoreFoundation 0x06338ce9 -[__NSCFData copyWithZone:] + 105 9 Foundation 0x04fa7531 -[NSSubrangeData initWithData:range:] + 484 10 Foundation 0x04f67727 -[NSData(NSData) subdataWithRange:] + 657 11 ESPTablet 0x00f53134 -[CWHessianUnarchiver(Private) readDataWithTag:] + 218 12 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 13 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 14 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 15 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 16 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 17 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 18 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 19 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 20 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 21 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 22 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 23 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 24 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 25 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 26 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 27 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 28 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 29 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 30 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 31 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 32 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 33 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 34 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 35 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 36 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 37 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 38 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 39 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 40 ESPTablet 0x00f531ba -[CWHessianUnarhiver(Private) readDataWithTag:] + 352 41 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 42 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 43 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 44 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 45 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 46 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 47 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 48 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 49 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 50 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 51 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 52 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 53 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 54 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 55 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 56 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 57 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 58 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 59 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 60 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 61 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 62 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 63 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 64 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 65 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 66 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 67 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 68 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 69 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 70 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 71 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 72 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 73 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 74 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 75 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 76 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 77 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 78 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 79 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 80 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 81 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 82 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 83 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 84 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 85 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 86 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 87 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 88 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 89 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 90 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 91 ESPTablet 0x00f531ba -[CWHessianUnarchiver(Private) readDataWithTag:] + 352 目前只能贴这么多 剩下的错误跟这些类似 |
| 6 hyzjshwo 2015-02-28 10:37:13 +08:00 @childs 我不知道你要干什么事 但是这句代码暴露了你或者你们对内存管理上的一些缺陷 [data appendData:[self.archiveData subdataWithRange:NSMakeRange(self.offset, len)]]; 这段在内存里会有两份pdf大小的空间。data这个变量来看你似乎只是临时使用，那你为什么要一段一段取self.archiveData 而不是直接使用呢？还有兄弟，如果是必现的bug都是最容易解决的bug。 |
 | 7 tuoxie007 2015-03-01 01:41:52 +08:00 看起来就是系统无法一次性申请到这么大的内存，因为你subdata出来的其实是个数组。总之大文件的处理最好不能一次性读到内存里，否则再多内存也不够你用，得分段处理数据流啊 |
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