NSJSONSerialization导致EXC_BAD_ACCESS

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问题描述

目前我正在编写一个应用程序（目标iOS 6，启用了ARC），它使用JSON进行数据传输，使用Core Data进行持久存储。 JSON数据是由PHP脚本通过json_encode在MySQL数据库中生成的。

Currently I am writing an app (Target iOS 6, ARC enabled) that uses JSON for data transmission and Core Data for persistent storage. The JSON data is generated out of a MySQL database by a PHP script via json_encode.

我的问题是，对于某些表中的数据，以下代码失败：

My Problem is that with data from certain tables the following code fails:

- (NSDictionary *)executeFetch:(NSString *)query
{
    NSURL *requesturl = [NSURL URLWithString:[query stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    NSError *dataError = nil;
    self.jsonData = [NSData dataWithContentsOfURL:requesturl options:kNilOptions error:&dataError];

    NSError *error = nil;
    self.jsonSerializationResult = [NSJSONSerialization JSONObjectWithData:self.jsonData options:NSJSONReadingMutableContainers|NSJSONReadingMutableLeaves error:&error];

    return self.jsonSerializationResult;

}

程序总是因行中出现EXC_BAD_ACCESS错误而崩溃它说self.jsonSerializationResult和Instruments说有一个Zombie被发现了。我知道这意味着我发送消息的对象是零，但我无法找到如何解决它...这就是乐器所说的：

The program always crashes with an EXC_BAD_ACCESS error on the line where it says self.jsonSerializationResult and Instruments says that there was a Zombie detected. I know that this means that some object I send a message to is nil, but I can't find out how to fix it... That's what Instruments has to say:

#   Address Category    Event Type  RefCt   Timestamp   Size    Responsible Library Responsible Caller
0   0xa1b8a70   CFString (mutable)  Malloc  1   00:01.603.081   32  Foundation  -[NSPlaceholderMutableString initWithBytesNoCopy:length:encoding:freeWhenDone:]
1   0xa1b8a70   CFString (mutable)  Release 0   00:01.603.137   0   Foundation  newJSONValue
2   0xa1b8a70   CFString (mutable)  Zombie  -1  00:01.603.259   0   Foundation  newJSONString

我的程序适用于除此之外的每个JSON输出：

My program works with every JSON output except for this one:

{
   "termin":[
      {
         "termin_id":"17",
         "veranstaltung_id":"20",
         "beginn":"2012-09-28 17:00:00",
         "ende":"2012-09-28 18:00:00",
         "freie_pl\u00e4tze":null
      },
      {
         "termin_id":"18",
         "veranstaltung_id":"26",
         "beginn":"2012-09-28 19:00:00",
         "ende":"2012-09-28 20:00:00",
         "freie_pl\u00e4tze":null
      },
      {
         "termin_id":"19",
         "veranstaltung_id":"26",
         "beginn":"2012-09-28 21:00:00",
         "ende":"2012-09-28 22:00:00",
         "freie_pl\u00e4tze":null
      },
      {
         "termin_id":"20",
         "veranstaltung_id":"46",
         "beginn":"2012-09-28 19:00:00",
         "ende":"2012-09-28 20:00:00",
         "freie_pl\u00e4tze":null
      },
      {
         "termin_id":"24",
         "veranstaltung_id":"66",
         "beginn":"2012-09-28 22:00:00",
         "ende":"2012-09-28 22:30:00",
         "freie_pl\u00e4tze":"120"
      }
   ]
}

I thought about some possible error sourced but none seems to be the responsible:

jsonData或jsonSerializationResult可能是nil：它们不是

PHP生成的无效JSON：使用验证器检查了它

null值：其他表没有问题

有没有人知道？

NSJSONSerialization

NSJSONSerialization导致EXC_BAD_ACCESS

问题描述

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