Twitter的GET Trends/:woeid的SBJSON解析问题 [英] SBJSON parsing issue with Twitter's GET trends/:woeid
问题描述
我正在尝试理解使用sbjson解析通过调用Twitter的GET Trends/:woeid返回的以下json时遇到的问题
I am trying to understand an issue I am having when using sbjson to parse the following json returned by a call to Twitter's GET trends/:woeid
我正在使用以下URL:@"http://api.twitter.com/1/trends/1.json",我得到以下响应:(为了节省空间而被截断了)
I am using the following URL: @"http://api.twitter.com/1/trends/1.json" and I get the following response: (truncated to save space)
[
{
"trends": [
{
"name": "Premios Juventud",
"url": "http://search.twitter.com/search?q=Premios+Juventud",
"query": "Premios+Juventud"
},
{
"name": "#agoodrelationship",
"url": "http://search.twitter.com/search?q=%23agoodrelationship",
"query": "%23agoodrelationship"
}
],
"as_of": "2010-07-15T22:40:45Z",
"locations": [
{
"name": "Worldwide",
"woeid": 1
}
]
}
]
这是我用来解析并显示名称和网址的代码:
Here is the code I'm using to parse and display the name and url:
NSMutableString *content = [[NSMutableString alloc] initWithBytes:[responseData bytes] length:[responseData length] encoding:NSUTF8StringEncoding];
[content replaceCharactersInRange:NSMakeRange(0, 1) withString:@""];
[content replaceCharactersInRange:NSMakeRange([content length]-1, 1) withString:@""];
NSLog(@"Content is: %@", content);
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSDictionary *json = [parser objectWithString:content];
//NSArray *trends = [json objectForKey:@"trends"];
NSArray *trends = [json objectForKey:@"trends"];
for (NSDictionary *trend in trends)
{
[viewController.names addObject:[trend objectForKey:@"name"]];
[viewController.urls addObject:[trend objectForKey:@"url"]];
}
[parser release];
这是示例代码,已被破坏,因为它针对的是Twitter的GET Trends(现已弃用).该代码仅在我手动删除第一个'['和最后一个']'时有效.但是,如果我不从响应中删除这些字符,则解析器将返回一个NSString元素,其中一个 NSString元素:json响应.
This is sample code that is broken because it was targeted to Twitter's GET trends call which is now deprecated. The code will only work if I manually remove the first '[' and last ']'. However if I don't remove those characters from the response, the parser returns a NSArray of one NSString element: the json response.
我应该如何正确解析此响应.预先感谢.
How should I correctly parse this response. Thanks in advance.
推荐答案
我自己解决了这个问题,我对NSArray感到困惑,因为只有一个元素似乎是字符串.
I worked the issue out myself, I was confused by the NSArray coming back with only one element that appeared to be a string.
数组中的一个元素不是NSString而是NSDictionary,一旦我理解了这一点,我就可以通过将元素分配给NSDictionary来正确处理数据,然后使用适当的键访问趋势"数据:
The one element in the array was not an NSString but a NSDictionary, once I understood this I could approach the data correctly by assigning the element to a NSDictionary, then accessing the "trends' data with the appropriate key:
NSMutableString *content = [[NSMutableString alloc] initWithBytes:[responseData bytes] length:[responseData length] encoding:NSUTF8StringEncoding];
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSArray *json = [parser objectWithString:content];
NSDictionary *trends = [json objectAtIndex:0];
for (NSDictionary *trend in [trends objectForKey:@"trends"])
{
[viewController.names addObject:[trend objectForKey:@"name"]];
[viewController.urls addObject:[trend objectForKey:@"url"]];
}
[parser release];
使用Apple提供的最新发布的NSJSONSerialization可以使其更加干净:
It's a bit cleaner using the newly released NSJSONSerialization provided by Apple:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSArray *json = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:nil];
NSDictionary *trends = [json objectAtIndex:0];
for (NSDictionary *trend in [trends objectForKey:@"trends"])
{
[viewController.names addObject:[trend objectForKey:@"name"]];
[viewController.urls addObject:[trend objectForKey:@"url"]];
}
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
[viewController.serviceView reloadData];
}
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