JSONKit崩溃：在iPad的ratina 64位设备模拟器iOS7 X $ C $Ç5.1 [英] JSONKit Crash: iOS7 Xcode 5.1 in iPad ratina 64 bit device simulator

问题描述

我已经使用 JSONKit 库来解析字典，并获得 JSON 字符串。一切都很好，好正常的设备（iOS7）。但是，当我运行的应用程序在iOS的7-64位模拟器它坠毁在下面的方法：

I have used JSONKit library to parse dictionary and get JSON string. All is well and good with normal devices (iOS7). But when i run application in iOS 7-64 bit simulator it was crashed at below method:

- (NSString *)JSONString;

和在这条线的崩溃消息显示 JSONKit.m 类

And the crash message shows on this line of JSONKit.m class

试图找出它，但无法理清。

Tried to find out it but not able to sort out.

和我结束了我们本土的 NSJSONSerialization 类。

And i ended up with our native NSJSONSerialization class.

难道任何一个理清这一点？

Did any one sort out this?

推荐答案

据我所知，有不止一个的补丁版本试图修复64位的崩溃问题，你提到这里，如通过heroims JSONKit 64位崩溃修复。

As far as I know there are more than one patch versions that tried to fix the 64 bit crash issue you mention here, e.g. JSONKit 64bit crash fix by heroims.

他们都试图解决这个棘手线获得的标记指针的第一件事，一个指向一个Objective-C的对象点是一个指向对象类：

They all tried to fix that troublesome line for getting tagged pointers, "the very first thing that a pointer to an Objective-C object "points to" is a pointer to that objects class":

*((void **)objectPtr) 

我写了一个简单的code，以模拟碰撞，

I wrote a simple code to emulate the crash,

NSDictionary *dic = @{@"hi":@(4)};
void *keys[2], *objects[2];
CFDictionaryGetKeysAndValues((CFDictionaryRef)dic, (const void **)keys, (const void **)objects);
void *objectPtr = objects[0];
void *another = *((void **)objectPtr);//Only works for 32 bit machine
NSLog(@"%@",[another description]);

我的猜测是，对于64位编译器，苹果改变了标记指针实现的NSNumber，这会导致崩溃。检查此标记指针的讨论<一href="http://stackoverflow.com/questions/5819387/why-is-nsnumber-immutable">stackoverflow.com/questions/5819387/why-is-nsnumber-immutable

如果我修改的NSDictionary * DIC = @ {@喜：@（4）}; 到的NSDictionary * DIC = @ {@ 喜：@你好}; 它不会崩溃

If I change NSDictionary *dic = @{@"hi":@(4)}; to NSDictionary *dic = @{@"hi":@"hello"}; it won't crash.

我这里所说的补丁只是用object_getClass，这似乎打败的初衷，为什么不直接使用 object_getClass（）？......（评论权以上）

The patch I mentioned here just used object_getClass, which seems to defeat the original purpose, "Why not just use object_getClass()?..." (the comments right above)

所以，就像你说的，现在我也最终使用NSJSONSerialization类。

So like you said now I also end up using NSJSONSerialization class.

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