Question

你好，所以我试图解析一个json，但每次我尝试失败。我已经尝试过这种方法，我最近使用过，除了这个以外的所有其他项目。 json是有效的。

 NSString *post = [NSString stringWithFormat:@"x=2&y=3&z=1"];

    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[[NSURL alloc] initWithString:@"link-to-php.php"]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:postData];


    NSURLResponse *requestResponse;
    NSData *requestHandler = [NSURLConnection sendSynchronousRequest:request returningResponse:&requestResponse error:nil];
    NSError *error;
    NSMutableDictionary *getJsonData = [NSJSONSerialization
                                        JSONObjectWithData:requestHandler
                                        options:NSJSONReadingMutableContainers
                                        error:&error];

    if( error )
    {
        NSLog(@"%@", [error localizedDescription]);
    }
    else {
        NSArray *json = getJsonData[@"data"];



        for ( NSDictionary *jsn in json )
        {


            NSLog(@"dea %@",jsn[@"content"]);
        }





    }

我的JSON代码就是这个

{"status":1,"error_message":null,"data":{"name":"Test","img":"","content":"Continut de test"}}

我得到的错误是

[__NSCFString objectForKeyedSubscript:]: unrecognized selector sent to instance 0x17e7b7c0
2015-08-03 14:58:50.706 InfoCons[4418:1720073] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString objectForKeyedSubscript:]: unrecognized selector sent to instance 0x17e7b7c0'

Answer 1

你的json formate返回字典中的字典格式数据而不是数组格式返回＆＃34;数据＆＃34;键。

尝试此代码从json获取数据：

 if( error )
    {
        NSLog(@"%@", [error localizedDescription]);
    }
    else {
        NSLog(@"%@",getJsonData[@"data"][@"content"]); // print value of dictionary
    }

解析NSCFString objectForKeyedSubscript时出错

1 个答案: