JSONKit使用Objective-C解析嵌套的JSON

Question

I am trying to parse my nested JSON with JSONKit and the 2nd level JSON isn't being parsed correctly.

Here's sample JSON...

{
    "app": {
        "content": "[{\\\"Id\\\":\\\"1\\\",\\\"Name\\\":\\\"John\\\"},{\\\"Id\\\":\\\"2\\\",\\\"Name\\\":\\\"John\\\"}]"
    }
}

and Here's my code...

NSString *jsonString = "...long nested json string...";

NSDictionary *jsonParsed = [jsonString objectFromJSONString];

NSString *content = [[jsonParsed objectForKey:@"app"] objectForKey:@"content"];

NSDictionary *jsonContent = [content objectFromJSONString];

NSLog(@"%@", jsonContent);

Where am I going wrong?

Answer 1

This is quite easy to answer: You are escaping \\ as well as " . So your result in the NSString* content will be \\" . This is something your JSON parser won't digest. So use instead of \\\\\\" this \\" .

Answer 2

If you replace the content string with following:

"[{\"Id\":\"1\",\"Name\":\"John\"},{\"Id\":\"2\",\"Name\":\"John\"}]"

It will be parsed correctly.

JSON.parse("[{\"Id\":\"1\",\"Name\":\"John\"},{\"Id\":\"2\",\"Name\":\"John\"}]")
>>> [Object { Id="1", Name="John"}, Object { Id="2", Name="John"}]

Maybe you have escaped the content string twice at somewhere in your code.

---

I just used firebug to see if the JSON was correct. JSONKit is the same:

clowwindy:~ clowwindy$ cat /tmp/input.txt 
{
    "app": {
        "content": "[{\"Id\":\"1\",\"Name\":\"John\"},{\"Id\":\"2\",\"Name\":\"John\"}]"
    }
}

NSError *error;
NSString *input = [NSString stringWithContentsOfFile:@"/tmp/input.txt" encoding:NSUTF8StringEncoding error:&error];

NSString *jsonString = input;

NSDictionary *jsonParsed = [jsonString objectFromJSONString];

NSString *content = [[jsonParsed objectForKey:@"app"] objectForKey:@"content"];

NSDictionary *jsonContent = [content objectFromJSONString];

NSLog(@"%@", jsonContent);
NSLog(@"%@", content);

2012-01-02 00:26:39.818 testjson[12700:707] (
        {
        Id = 1;
        Name = John;
    },
        {
        Id = 2;
        Name = John;
    }
)
2012-01-02 00:26:39.822 testjson[12700:707] [{"Id":"1","Name":"John"},{"Id":"2","Name":"John"}]