Too long a string for JSONValue ?

[ggekko]

Hi everyone,


I'm pretty new to iphone sdk, so please excuse me if my question doesn't make sense !

I have an issue with json parsing :
- I established a connection to a remote server to receive a json object, which looks like this :

{"news1":{"title":"hello", "content":"hello world"}, "news2":{"title":"hi", "content":"hi world"}, .... }

- In the didReceiveData method, I assigned the json string :

NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

- then I built my dictionary :

NSDictionary *results = [jsonString JSONValue];

As long as the "content" string doesn't exceed a certain number of characters, everything works fine.

But if my "content" string becomes very long (which should be the case at the end of my project), the news do not load and the console returns the following error :

2009-11-16 16:25:16.778 newsReaderV5[3448:207] -JSONValue failed. Error trace is: (
Error Domain=org.brautaset.JSON.ErrorDomain Code=5 UserInfo=0x3b29380 "Unescaped control character '0x0'",
Error Domain=org.brautaset.JSON.ErrorDomain Code=3 UserInfo=0x3b29770 "Object value expected for key: content",
Error Domain=org.brautaset.JSON.ErrorDomain Code=3 UserInfo=0x3b29850 "Object value expected for key: news1"
)
2009-11-16 16:25:16.789 newsReaderV5[3448:207] -JSONValue failed. Error trace is: (
Error Domain=org.brautaset.JSON.ErrorDomain Code=3 UserInfo=0x3b2a3c0 "Unrecognised leading character"
)

Does anyone have an idea about what all this means ? I'm completely stuck here...

Thanks in advance for your help !

[ggekko]

I found a solution !


After a NSLog, I noticed that the parsed json object was not entirely loaded. I don't know why, but it seems that NSString objects have a limited size.
So I managed getting all that data into my NSString string by doing so :

	if(jsonString == nil)
	{
	jsonString = [[NSMutableString alloc] initWithData:data encoding:NSUTF8StringEncoding];

	}
	else {
		NSMutableString *temp_string = [[NSMutableString alloc] initWithString:jsonString];
		
		[jsonString release];
		jsonString = [[NSMutableString alloc] initWithData:data encoding:NSUTF8StringEncoding];
		[temp_string appendString:jsonString];
	
		[jsonString release];
		jsonString = [[NSMutableString alloc] initWithString: temp_string];
		[temp_string release];

	}

I know the code is not that clear, but I didn't find any other solution yet !


If anyone finds a better way, let me know !

[davidPan]

for update

	int tmpNetStatus = [[SBJsonStreamParser new]parse:data];
		
		switch (tmpNetStatus) {
			case SBJsonStreamParserComplete:

				break;
			case SBJsonStreamParserWaitingForData:
				jsonString = nil;
				jsonString = [[NSMutableString alloc] initWithData:data encoding:NSUTF8StringEncoding];
				break;
			case SBJsonStreamParserError:
			{
				if (jsonString == nil) {
					return;
				}
				
				NSMutableString *temp_string = [[NSMutableString alloc] initWithString:jsonString];
				jsonString = [[NSMutableString alloc] initWithData:data encoding:NSUTF8StringEncoding];
				[temp_string appendString:jsonString];
				[jsonString release];
				jsonString = nil;
				
				
				//do what you want to
				}
			}
				break;
			default:
				break;
		}

[lucav]

Originally Posted by davidPan

for update

	int tmpNetStatus = [[SBJsonStreamParser new]parse:data];
		
		switch (tmpNetStatus) {
			case SBJsonStreamParserComplete:

				break;
			case SBJsonStreamParserWaitingForData:
				jsonString = nil;
				jsonString = [[NSMutableString alloc] initWithData:data encoding:NSUTF8StringEncoding];
				break;
			case SBJsonStreamParserError:
			{
				if (jsonString == nil) {
					return;
				}
				
				NSMutableString *temp_string = [[NSMutableString alloc] initWithString:jsonString];
				jsonString = [[NSMutableString alloc] initWithData:data encoding:NSUTF8StringEncoding];
				[temp_string appendString:jsonString];
				[jsonString release];
				jsonString = nil;
				
				
				//do what you want to
				}
			}
				break;
			default:
				break;
		}

potresti postare il codice completo?

[lucav]

can you post the complete code?
thank you