Question

我想将json数据放到一个块中，但它失败了。

互联网请求

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *dataResult, NSError *connectionError) {        
if (!connectionError) {
    if (successBlock) {
        //NSString* str = [[NSString alloc] initWithData:dataResult encoding:NSUTF8StringEncoding];
        //NSLog(@"response data: %@", str);
        NSDictionary *json = [[NSDictionary alloc]init];
        json = [NSJSONSerialization JSONObjectWithData:dataResult options:kNilOptions error:nil];
        successBlock(json);
    }
} else {
    if (failureBlock) {
        failureBlock(connectionError);
    }
}
}];

successBlock定义如下：

typedef void(^HttpRequestSuccessBlock)(id responseObject);
typedef void(^HttpRequestFailBlock)(NSError *error);

我可以成功获取dataResult中的1并将其转换为NSString，我NSlog，它实际上是Json格式。

但是当运行代码时，它崩溃并显示以下错误：

2017-08-21 09:43:22.258 shopiPhoneDemo[24397:5799646] -[__NSDictionaryI bytes]: unrecognized selector sent to instance 0x7faa75501220
2017-08-21 09:43:22.264 shopiPhoneDemo[24397:5799646] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryI bytes]: unrecognized selector sent to instance 0x7faa75501220'

更新堆栈跟踪：

2017-08-21 09:43:22.258 shopiPhoneDemo[24397:5799646] -[__NSDictionaryI bytes]: unrecognized selector sent to instance 0x7faa75501220
2017-08-21 09:43:22.264 shopiPhoneDemo[24397:5799646] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryI bytes]: unrecognized selector sent to instance 0x7faa75501220'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000105e8cb0b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x00000001058f1141 objc_exception_throw + 48
    2   CoreFoundation                      0x0000000105efc134 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
    3   CoreFoundation                      0x0000000105e13840 ___forwarding___ + 1024
    4   CoreFoundation                      0x0000000105e133b8 _CF_forwarding_prep_0 + 120
    5   Foundation                          0x00000001054281a1 -[_NSJSONReader findEncodingFromData:withBOMSkipLength:] + 46
    6   Foundation                          0x0000000105428087 -[_NSJSONReader parseData:options:] + 58
    7   Foundation                          0x0000000105427fbb +[NSJSONSerialization JSONObjectWithData:options:error:] + 139
    8   shopiPhoneDemo                      0x0000000104cc4e2d __24-[AppDelegate youtuTest]_block_invoke + 77
    9   shopiPhoneDemo                      0x0000000104cbfc3f __62-[TXQcloudFrSDK sendRequest:mothod:successBlock:failureBlock:]_block_invoke + 271
    10  CFNetwork                           0x0000000108a045ae __67+[NSURLConnection sendAsynchronousRequest:queue:completionHandler:]_block_invoke_2 + 161
    11  Foundation                          0x00000001053fb3b7 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
    12  Foundation                          0x00000001053fb0bb -[NSBlockOperation main] + 101
    13  Foundation                          0x00000001053f9877 -[__NSOperationInternal _start:] + 627
    14  Foundation                          0x00000001053f55fc __NSOQSchedule_f + 198
    15  libdispatch.dylib                   0x000000010940905c _dispatch_client_callout + 8
    16  libdispatch.dylib                   0x00000001093ea40b _dispatch_main_queue_callback_4CF + 411
    17  CoreFoundation                      0x0000000105e51909 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
    18  CoreFoundation                      0x0000000105e17ae4 __CFRunLoopRun + 2164
    19  CoreFoundation                      0x0000000105e17016 CFRunLoopRunSpecific + 406
    20  GraphicsServices                    0x000000010b4bba24 GSEventRunModal + 62
    21  UIKit                               0x0000000106999134 UIApplicationMain + 159
    22  shopiPhoneDemo                      0x0000000104cd0eff main + 111
    23  libdyld.dylib                       0x000000010945565d start + 1
)
    libc++abi.dylib: terminating with uncaught exception of type NSException

Json NSLog是：

{"errorcode":0,"errormsg":"OK","session_id":"","name":"陈佳佳","name_confidence_all":[99,99,99],"sex":"女","sex_confidence_all":[99],"nation":"汉","nation_confidence_all":[99],"birth":"1985/9/11","birth_confidence_all":[100,100,100,100,100,100,100,100,100],"address":"福建省尤溪县汤川乡汤三村16号","address_confidence_all":[99,99,99,99,99,99,99,99,99,99,99,99,99,99,99],"id":"350426198509113027","id_confidence_all":[100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100],"frontimage":"","frontimage_confidence_all":[],"watermask_confidence_all":[],"valid_date_confidence_all":[],"authority_confidence_all":[],"backimage_confidence_all":[],"detail_errorcode":[],"detail_errormsg":[]}

{
"errorcode": 0,
"errormsg": "OK",
"session_id": "",
"name": "陈佳佳",
"name_confidence_all": [
  99,
  99,
  99
],
"sex": "女",
"sex_confidence_all": [
  99
],
"nation": "汉",
"nation_confidence_all": [
  99
],
"birth": "1985/9/11",
"birth_confidence_all": [
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100
],
"address": "福建省尤溪县汤川乡汤三村16号",
"address_confidence_all": [
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99,
  99
],
"id": "350426198509113027",
"id_confidence_all": [
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100
],
"frontimage": "",
"frontimage_confidence_all": [],
"watermask_confidence_all": [],
"valid_date_confidence_all": [],
"authority_confidence_all": [],
"backimage_confidence_all": [],
"detail_errorcode": [],
"detail_errormsg": []
}

我试图做的事情：

我尝试为mutablecopy制作json，但它不起作用。
我尝试将id更改为NSDictionary，但它也没有。

Answer 1

您可能正在处理NSArray而不是NSDictionary。因此，处理这两种情况会更好。

id json = [NSJSONSerialization JSONObjectWithData:dataResult options:kNilOptions error:nil];

if ([json isKindOfClass:[NSArray class]]) {
    NSLog(@"its an array!");
    NSArray *jsonArray = (NSArray *)json;
    NSLog(@"jsonArray - %@",jsonArray);
}
else {
    NSLog(@"its probably a dictionary");
    NSDictionary *jsonDictionary = (NSDictionary *)json;
    NSLog(@"jsonDictionary - %@",jsonDictionary);
}

Answer 2

我认为数据内部或json parcer内部存在问题。尝试使用其他json解析器和开放代码，例如https://github.com/johnezang/JSONKit/blob/master/JSONKit.h。你可以找到，究竟是什么发送了这个例外。

[__NSDictionaryI bytes]：无法识别的选择器发送到实例0x7faa75501220

2 个答案: