如何获取由OSX上的SLRequest返回的NSCFDictionary内的数据？ [英] How to get data that's inside NSCFDictionary returned by SLRequest on OSX?

问题描述

  SLRequest * facebookRequest = [SLRequest requestForServiceType：SLServiceTypeFacebook 
 requestMethod：SLRequestMethodGET 
 URL：[NSURL URLWithString：@https://graph.facebook.com/fql] 
参数：[NSDictionary dictionaryWithObject：@SELECT uid，name，pic_square FROM user WHERE uid IN（SELECT uid2 FROM friend WHERE uid1 = me（））forKey：@q]]; 
 
 [facebookRequest setAccount：_facebookAccount]; 
 
 [facebookRequest performRequestWithHandler：^（NSData * responseData，NSHTTPURLResponse * urlResponse，NSError * error）{
 if（！error）{
 id json = [NSJSONSerialization JSONObjectWithData：responseData options ：0 error：nil]; 
 NSLog（@％@，[json class]）; 
 // NSCFDictionary。我该如何获取这个数据？ 
} else {
 NSLog（@error fb）; 
} 
}];任何关于如何检索NSCFDictionary内的数据的想法？我试过 [json valueforKey ...] 但没有
解决方案
使用NSDictionary的 -objectForKey：方法：
  id json = [NSJSONSerialization JSONObjectWithData：responseData选项：0 error：nil]; 
 if（[json isKindOfClass：[NSDictionary class]]）{
 NSDictionary * dict =（NSDictionary *）json; 
 for（NSString * key in dict）{
 id object = [dict objectForKey：key]; 
 NSLog（@键\％@ \的对象是：％@，key，object）; 
} 
} 
  
顺便提一句，一个NSCFDictionary可以像NSDictionary一样对待。这是一个SO问题，解释为：什么是NSCFDictionary？一旦你知道，你可以很容易地弄清楚如何处理通过查看NSDictionary的文档。
 
I make this facebook request:
SLRequest *facebookRequest = [SLRequest requestForServiceType:SLServiceTypeFacebook
                                                    requestMethod:SLRequestMethodGET
                                                              URL:[NSURL URLWithString:@"https://graph.facebook.com/fql"]
                                                       parameters:[NSDictionary dictionaryWithObject:@"SELECT uid, name, pic_square FROM user WHERE uid IN (SELECT uid2 FROM friend WHERE uid1 = me())" forKey:@"q"]];

[facebookRequest setAccount:_facebookAccount];

[facebookRequest performRequestWithHandler:^(NSData* responseData, NSHTTPURLResponse* urlResponse, NSError* error) {
     if(!error){
           id json = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:nil];
           NSLog(@"%@", [json class]); 
           //NSCFDictionary. How can i get the data that's inside this?
     }else{
           NSLog(@"error fb");
            }
     }];
Any thoughts on how to retrieve the data inside the NSCFDictionary? I've tried [json valueforKey...] but nothing
解决方案
Use NSDictionary's -objectForKey: method:
id json = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:nil];
if ([json isKindOfClass:[NSDictionary class]]) {
    NSDictionary *dict = (NSDictionary*)json;
    for (NSString *key in dict) {
        id object = [dict objectForKey:key];
        NSLog(@"The object for key \"%@\" is: %@", key, object);
    }
}
Incidentally, it wouldn't take much to figure out that a NSCFDictionary can be treated like a NSDictionary. Here's one SO question that explains that: What is an NSCFDictionary? Once you know that, you can easily figure out how to deal with it by looking at the documentation for NSDictionary.

                        
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