NSJSONSerialization - 无法将数据转换为字符串 [英] NSJSONSerialization - Unable to convert data to string

问题描述

我在使用NSJSONSerialization从Met Office Datapoint API读取JSON时遇到问题。

我收到以下错误

 错误Domain = NSCocoaErrorDomain Code = 3840操作无法完成。（Cocoa错误3840.）（无法将数据转换为字符58208周围的字符串。
 

我已检查并认为这是根据字符位置的违规行

  {id：353556，latitude：57.1893，longitude： -  5.0929，name：sóilChaorainn } 
  

根据我尝试的两个验证器，JSON本身似乎有效，

NSJSONSerialization不应该使用'ó'等字符吗？

如果没有，我该如何改变编码类型来处理这个问题？

很感谢提前

$

为了使其工作，首先使用NSISOLatin1StringEncoding从URL内容创建一个字符串，然后使用NSUTF8编码创建要在NSJSONSerialization中使用的NSData。

以下工作创建相应的json对象

  NSError * error; 
 NSString * string = [NSString stringWithContentsOfURL：[NSURL URLWithString：@http://datapoint.metoffice.gov.uk/public/data/val/wxfcs/all/json/sitelist?key=<YOUR_API_KEY ] encoding：NSISOLatin1StringEncoding错误：&错误]; 
 
 NSData * metOfficeData = [string dataUsingEncoding：NSUTF8StringEncoding]; 
 
 id jsonObject = [NSJSONSerialization JSONObjectWithData：metOfficeData options：kNilOptions error：& error]; 
 
 if（error）{
 //错误处理
} else {
 //使用你的json对象
 NSDictionary * locations = [jsonObject objectForKey： @Locations]; 
 NSArray * location = [locations objectForKey：@Location]; 
 NSLog（@从DataPoint接收％d个位置，[位置计数]）; 
} 
  

I'm having a problem with NSJSONSerialization reading JSON from the Met Office Datapoint API.

I get the following error

Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Unable to convert data to string around character 58208.

I have checked and think this is the offending line according to the character position

{"id":"353556","latitude":"57.1893","longitude":"-5.0929","name":"Sóil Chaorainn"}

The JSON itself appears to be valid according to a couple of Validators I tried, and I would expect it too be from a large organisation such as Met Office.

Shouldn't NSJSONSerialization work fine with characters such as 'ó'?

If not how do I go about changing the encoding type to deal with this?

Many Thanks in Advance

解决方案

The Met Office Datapoint sends back data in ISO-8859-1 which isn't one of the supported data format for NSJSONSerialization.

To make it work create a string from the URL content at first with NSISOLatin1StringEncoding and then create the NSData you want to use in the NSJSONSerialization with a NSUTF8 encoding.

The following works to create the corresponding json object

NSError *error;
NSString *string = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://datapoint.metoffice.gov.uk/public/data/val/wxfcs/all/json/sitelist?key=<YOUR_API_KEY"] encoding:NSISOLatin1StringEncoding error:&error];

NSData *metOfficeData = [string dataUsingEncoding:NSUTF8StringEncoding];

id jsonObject = [NSJSONSerialization JSONObjectWithData:metOfficeData options:kNilOptions error:&error];

if (error) {
    //Error handling
} else {
    //use your json object
    NSDictionary *locations = [jsonObject objectForKey:@"Locations"];
    NSArray *location = [locations objectForKey:@"Location"];
    NSLog(@"Received %d locations from the DataPoint", [location count]);
}

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