Question

我无法相信我甚至无法使用JSONKit这个简单的测试存根......

我有一个包含有效JSON文档的json文件，以及这个简单的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    NSError *err = nil;
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"dk" ofType:@"json"];
    NSData *jsonData = [NSData dataWithContentsOfFile:filePath options:NSDataReadingMappedIfSafe error:&err];

    NSString *dkk = [[NSString alloc] initWithContentsOfFile:filePath];
    NSLog(@"Found file with contents: \n%@",dkk);

    if(jsonData)
    {
        NSLog(@"Data length is: %d",[jsonData length]);
        id objectReturnedFromJSON = [jsonData objectFromJSONData];
        if(objectReturnedFromJSON)
        {
            if([objectReturnedFromJSON isKindOfClass:[NSDictionary class]])
            {
                NSDictionary * dictionaryFromJSON = (NSDictionary *)objectReturnedFromJSON;
                // ...
            } else {
                NSLog( @"no dictionary from the data returned by the server... check the data to see if it's valid JSON");
            }
        } else {
            NSLog( @"nothing valid returned from the server...");
        }
    } else {
        NSLog( @"no data back from the server");
    }

}

objectFromJSONData的结果似乎总是返回null。输出如下所示：

2013-01-15 00:58:37.187 JSONTest[38110:c07] Found file with contents: 
myObject = {
    "first": "John",
    "last": "Doe",
    "age": 39,
    "sex": "M",
    "salary": 70000,
    "registered": true,
    "favorites": {
        "color": "Blue",
        "sport": "Soccer",
        "food": "Spaghetti"
    } 
}

2013-01-15 00:58:51.818 JSONTest[38110:c07] Data length is: 196
2013-01-15 00:58:54.058 JSONTest[38110:c07] Data length is: (null)
(lldb)

我错过了什么？输入JSON有效（如NSLog语句所示）。

很抱歉，如果这是一个愚蠢的事情，但即使在这个小小的测试案例中，我也浪费了太多时间，让我觉得我错过了一些东西。

Answer 1

您拥有的JSON无效。它没有根元素，myObject键也没有括在括号内。

JSONKit - objectFromJSONData似乎总是返回nil

1 个答案: