responseString为null

Question

my webservice returns json string with new lines so It causes problem that responseString gives always null.

NSString *responseString=[[NSString alloc] initWithData:kampanyadata encoding:NSUTF8StringEncoding];

NSLog(@"%@",[NSString stringWithFormat:@"responsestring:%@",responseString]);

----responsestring:null

how can I replaces new lines character in JSON String?

Answer 1

NSString *tempString = [tempString stringByReplacingOccurrencesOfString:@"\n" withString:@" "];

我认为您需要这样做:)

Answer 2

Are you sure kampanyadata is not null? If it's not null try to use NSASCIIStringEncoding like this:

NSString *responseString=[[NSString alloc] initWithData:kampanyadata encoding:NSASCIIStringEncoding];.

Offtopic

And btw the NSLog(); method takes a NSString formatted already as parameter so you can use:

NSLog(@"responsestring:%@",responseString);

Answer 3

    soapResults = [[NSString alloc]
                    initWithBytes: [webData mutableBytes]
                    length:[webData length]
                    encoding:NSUTF8StringEncoding];

try this this works fine for me

Answer 4

You got some NSData, and you tried to convert it to an NSString. There's no JSON involved at this point. Any errors have nothing to do with JSON or newline characters whatsoever. Possibilities: 1. The NSData that you received is nil. 2. The NSData that you received isn't in UTF-8 format.

Your NSLog statement is quite funny. Look at the definition of NSLog - the first parameter is a format string. Instead of

NSLog(@"%@",[NSString stringWithFormat:@"responsestring:%@",responseString]);

you should write

NSLog (@"responseString:%@", responseString);

And you can pass the JSON document directly to NSJSONSerializer. No need to convert it to an NSString. Actually, if the data is large, just a waste of valuable memory.