ios - flickr 无法解析 JSON

Question

我正在使用 flickr 公共(public) API，但我在解析 JSON 时遇到问题。这是我的代码。

 NSString *urlString = @"https://api.flickr.com/services/feeds/photos_public.gne?format=json";
    NSURL *url = [NSURL URLWithString:urlString];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
   // operation.responseSerializer = [AFJSONResponseSerializer serializer];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        //(JSON text did not start with array or object and option to allow fragments not set.)
        NSString *rawString = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

        NSData *refinedData = [responseObject subdataWithRange:NSMakeRange([@"jsonFlickrFeed(" length], [responseObject length]-([@"jsonFlickrFeed(" length]+1))];
        NSError *parseError = nil;

        NSDictionary *jsonObject=[NSJSONSerialization
                                  JSONObjectWithData:refinedData
                                  options:NSJSONReadingMutableLeaves
                                  error:&parseError];
        NSError *parsingError = nil;



    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {


    }];

    [operation start];

解析时出错:

Error Domain=NSCocoaErrorDomain Code=3840 "The data couldn’t be read because it isn’t in the correct format." (Invalid escape sequence around character 15901.) UserInfo=0x7fa613da71c0 {NSDebugDescription=Invalid escape sequence around character 15901.}

解析时是否需要指定特定的字符集？

由于 API 响应不在我的控制范围内，因此需要在我这边完成哪些更改。

解决方法: @vishnuvaran 的猜测在逻辑上是正确的，除此之外我们需要转义“\”这个字符，然后只有我才能解析 JSON。

[requiredString replaceOccurrencesOfString:@"\\\'"  withString:@" "   options:NSLiteralSearch range:NSMakeRange(0, [requiredString length])];

Answer 1

您提供了错误的子数据范围。只需更改这一行

NSData *refinedData = [responseObject subdataWithRange:NSMakeRange([@"jsonFlickrFeed(" length], [responseObject length]-([@"jsonFlickrFeed(" length]+1))];

下一行

NSData *refinedData = [responseObject subdataWithRange:NSMakeRange([@"jsonFlickrFeed(" length], ([responseObject length]-1)-([@"jsonFlickrFeed(" length]))];

希望对你有所帮助。