ios - [__NSDictionaryI bytes]: unrecognized selector sent to instance 0x7faa75501220 -

i want json data block, failed.

1. the internet request is

   [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);     } } }]; 

2. the successblock defined this:

   typedef void(^httprequestsuccessblock)(id responseobject); typedef void(^httprequestfailblock)(nserror *error); 

3. i can dataresult in 1 , translate nsstring, , nslog it, json format.

but when run code, crashed , shows following errors:

2017-08-21 09:43:22.258 shopiphonedemo[24397:5799646] -[__nsdictionaryi bytes]: unrecognized selector sent instance 0x7faa75501220 2017-08-21 09:43:22.264 shopiphonedemo[24397:5799646] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nsdictionaryi bytes]: unrecognized selector sent instance 0x7faa75501220' 

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update stack trace:

2017-08-21 09:43:22.258 shopiphonedemo[24397:5799646] -[__nsdictionaryi bytes]: unrecognized selector sent instance 0x7faa75501220 2017-08-21 09:43:22.264 shopiphonedemo[24397:5799646] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nsdictionaryi bytes]: unrecognized selector sent 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 uncaught exception of type nsexception 

the json nslog is:

{"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":[]} 

i use json editor format is:

{ "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": [] } 

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what have tried do:

1. i try make mutablecopy json, doesn't working.
2. i try change id nsdictionary, doesn't working either.

might dealing nsarray rather nsdictionary. it's better handle both of cases.

id json = [nsjsonserialization jsonobjectwithdata:dataresult options:kniloptions error:nil];  if ([json iskindofclass:[nsarray class]]) {     nslog(@"its array!");     nsarray *jsonarray = (nsarray *)json;     nslog(@"jsonarray - %@",jsonarray); } else {     nslog(@"its dictionary");     nsdictionary *jsondictionary = (nsdictionary *)json;     nslog(@"jsondictionary - %@",jsondictionary); }