iOS Development--Error summary & common errors and warnings in development summary (19)

Summary of common errors and warnings in development (19)

]nsjsonserialization Parsing error is neither a dictionary nor an array

Recently in the implementation of JSON parsing encountered a very classic error, looking for a long time did not find a good, method, after looking at the Internet, found that their brains were squeezed by the door!

I managed to get the data from my server. And get it after my data is sent to the function to analyze;

1- (void) Readin: (Nsmutabledata *) s {2NSLog (@"Reading in the following:");3NSString * Prints =[[NSString alloc] initwithdata:s encoding:nsutf8stringencoding];4NSLog (@"%@", prints);5 6Nserror *error =Nil;7NSData *jsondata =[[NSData alloc] initwithdata:s];8 9     if(jsondata) {Ten  One         IDJsonobjects = [Nsjsonserialization jsonobjectwithdata:jsondata options:nsjsonreadingmutablecontainers error:&ERROR]; A  -         if([Jsonobjects iskindofclass: [Nsarrayclass]]) -NSLog (@"Yes we got an Array"); the         Else if([Jsonobjects iskindofclass: [nsdictionaryclass]]) -NSLog (@"Yes we got an dictionary"); -         Else -NSLog (@"neither array nor dictionary!"); +  -  +  A         if(Error) { atNSLog (@"error is%@", [Error localizeddescription]); -             return; -         } -  -Nsarray *keys =[Jsonobjects AllKeys]; -          for(NSString *keyinchkeys) { inNSLog (@"%@ is%@", Key, [jsonobjects Objectforkey:key]); -         } to  +}Else { -  the         //Handle Error *     }  $}

Now what I'm printing on the console is:

• 2012-08-17 13:59:57.667 TaraftarlikOyunu[1157:c07] Reading in the following:2012-08-17 13:59:57.667 TaraftarlikOyunu[1157:c07] {"uID":"5878341","tm":"fb","hh":122,"pt":75,"coin":500,"ll":1,"qlevel":1,"coect":true,"potWeekly":{"pts":75,"intval":604800000},"acent":{"chamunt":0},"mes":[]}2012-08-17 13:59:57.668 TaraftarlikOyunu[1157:c07] neither array nor dictionary!2012-08-17 13:59:57.670 TaraftarlikOyunu[1157:c07] error is The operation couldn’t be completed. (Cocoa error 3840.)

Looks like the legal JSON object to me. Where did I do it wrong?

I got the data from Nsstream; Get the data from the server and here is my code to get it:

1  Casensstreameventhasbytesavailable: {2             if(Stream = =InputStream) {3NSLog (@"InputStream is ready.");4 5uint8_t buf[1024x768];6UnsignedintLen =0;7 8Len = [InputStream read:buf maxLength:1024x768];9NSLog (@"Length%i", Len);Ten                 if(Len >0) { One  Ansmutabledata* Data=[[nsmutabledata Alloc] Initwithlength:0]; -[Data appendbytes: (Const void*) buf Length:len]; - [self readin:data]; the  -                 } -             } -              Break; +}

Workaround 1:

The problem is that I get the JSON string to be terminated with null at the end, and when I try to deserialize it can not be converted to nsdictionary or Nsarray. Making a little change to the code makes everything perfect. The real code should be like this

1  Casensstreameventhasbytesavailable: {2         if(Stream = =InputStream) {3 4NSLog (@"InputStream is ready.");5 6uint8_t buf[1024x768];7UnsignedintLen =0;8 9Len = [InputStream read:buf maxLength:1024x768];TenNSLog (@"Length%i", Len); One             if(Len >0) { A  -Datum =[[nsmutabledata alloc] Initwithlength:0]; -  the[Datum appendbytes: (Const void*) BUF length:len-1]; -  -  -  +  -Nsdictionary * Jsondict =[nsjsonserialization jsonobjectwithdata:datum options:nsutf8stringencoding Error:nil]; +  ANSLog (@"is valid JSON object%d", [nsjsonserialization isvalidjsonobject:jsondict]); at  -  - [self readin:datum]; -                 } -             } -              Else { inNSLog (@"No buffer!"); -             } to              Break; +             } -  the  *     default: { $NSLog (@"Stream is sending an Event:%i",Event);Panax Notoginseng  -          Break; the     } +}

The only difference from the other is the last byte I threw, which became a valid JSON dictionary. Thank you for being interested in my question.

iOS Development--Error summary & common errors and warnings in development summary (19)