未归档对象会发生什么？ [英] What happens with unarchived objects?
问题描述
使用NSKeyedUnarchiver解除封存物件后，我可以照常使用，但我无法重新封存。当我尝试，它崩溃。
After I've unarchived an object with NSKeyedUnarchiver, I am able to use it like usual, but I am unable to re-archive it. When I try, it crashes.
[NSKeyedArchiver archiveRootObject:unarchivedObject toFile:fileName];
我尝试查看苹果的开发人员资源，但我还没有看到彻底解释正确的使用的NSKeyedArchiver。请帮助。
I tried looking in the developer resources in apple but I haven't seen a thorough explination of proper usage of NSKeyedArchiver. Please Help.
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000023
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Application Specific Information:
objc_msgSend() selector name: replacementObjectForKeyedArchiver:
iPhone Simulator 3.2 (193.8), iPhone OS 3.2 (iPad/7B367)
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x958a0ed7 objc_msgSend + 23
1 OGLGame 0x0000c7e2 -[Sounds encodeWithCoder:] + 59 (Sounds.m:86)
2 Foundation 0x0280d25b _encodeObject + 827
3 Foundation 0x028243cc -[NSKeyedArchiver _encodeArrayOfObjects:forKey:] + 284
4 Foundation 0x0281a367 -[NSArray(NSArray) encodeWithCoder:] + 615
5 Foundation 0x0280d25b _encodeObject + 827
6 OGLGame 0x0000ebc2 -[Row encodeWithCoder:] + 244 (Row.m:153)
7 Foundation 0x0280d25b _encodeObject + 827
8 Foundation 0x028243cc -[NSKeyedArchiver _encodeArrayOfObjects:forKey:] + 284
9 Foundation 0x0281a367 -[NSArray(NSArray) encodeWithCoder:] + 615
10 Foundation 0x0280d25b _encodeObject + 827
11 Foundation 0x0285de10 +[NSKeyedArchiver archiveRootObject:toFile:] + 176
据我所知，是我的Sounds类。
As far as I can tell, it might be my Sounds class. I'll check it over while you check this over.
虽然经过研究，我发现：
Although, after research I found this:
replacementObjectForKeyedArchiver:
被子类覆盖以替换另一个对象
Overridden by subclasses to substitute another object for itself during keyed archiving.
- （id）replacementObjectForKeyedArchiver：（NSKeyedArchiver *）archiver
参数
archiver
创建存档的键控存档。
返回值
对象编码而不是接收者（如果不同）。
Parameters archiver A keyed archiver creating an archive. Return Value The object encode instead of the receiver (if different).
讨论
方法仅在编码器中未设置对象的替换映射（例如，由于之前调用replacementObjectForKeyedArchiver：到该对象）时才被调用。
推荐答案
苹果开发论坛上的线程似乎表明 replacementObjectForKeyedArchiver：在您尝试编码的对象上调用。这听起来像你试图编码的对象之一 - [Sounds encodeWithCoder：] 已经释放内存和 replacementObjectForKeyedArchiver：
A thread on the Apple dev forums seems to indicate that replacementObjectForKeyedArchiver: is called on the objects you are attempting to encode. It sounds like one of the objects you are trying to encode inside -[Sounds encodeWithCoder:] has been freed from memory and replacementObjectForKeyedArchiver: is being called it on causing a seg fault.
https://devforums.apple.com/message/1079616
这篇关于未归档对象会发生什么？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！
