Question

I am using the SBJson framework found at github(brilliant stuff) https://github.com/stig/json-framework/

with example : http://blog.zachwaugh.com/post/309924609/how-to-use-json-in-cocoaobjective-c

This twitter example works great now.

So I change my url and

for (NSDictionary *status in statuses)
{
 // You can retrieve individual values using objectForKey on the status NSDictionary
 // This will print the tweet and username to the console
 NSLog(@"%@ - %@", [status objectForKey:@"text"], [[status objectForKey:@"user"] objectForKey:@"screen_name"]);
}

to

for (NSDictionary *status in statuses)
{
  // You can retrieve individual values using objectForKey on the status NSDictionary
  // This will print the tweet and username to the console
  NSLog(@"%@ - %@", [status objectForKey:@"text"], [[status objectForKey:@"message"] objectForKey:@"nationalad"]);
}

so my json on my page has message: and a nationalad: yet I don’t get any return or or log print out. These are the only 2 things I have changed.

Any Ideas?

This is for the edit:

 SBJsonParser *parser = [[SBJsonParser alloc] init];

// Prepare URL request to download statuses from Twitter
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.mywebpagehere.com"]];

// Perform request and get JSON back as a NSData object
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

// Get JSON as a NSString from NSData response
NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];

// parse the JSON response into an object
// Here we're using NSArray since we're parsing an array of JSON status objects
NSArray *statuses = [parser objectWithString:json_string error:nil];

// Each element in statuses is a single status
// represented as a NSDictionary
for (NSDictionary *status in statuses)
{
    // You can retrieve individual values using objectForKey on the status NSDictionary
    // This will print the tweet and username to the console
    //NSLog(@"%@ - %@", [status objectForKey:@"text"], [[status objectForKey:@"message"] objectForKey:@"nationalad"]);
  //  NSLog(@"Message: %@", [status objectForKey:@"message"]);

 }
  // NSDictionary *json = [NSString JSONValue];
  NSLog(@"Status: %@", statuses);     
  // NSArray *items = [statuses valueForKeyPath:@"data.array"];
  //NSLog(@"message : %@", [[items objectAtIndex:1] objectForKey:@"message"]);

and the server page:

{
'message': "<p style=\"color:#FFFFFF;font-family:'Century Gothic',futura,'URW Gothic L',Verdana,sans-serif;\">Welcome!<\/p><p style=\"color:#FFFFFF;font-family:'Century Gothic',futura,'URW Gothic L',Verdana,sans-serif;\">Check out today's Dinner and Lunch specials below!<\/p>",
'nationalad': "<img src='http:\/\/www.mywebpage.com\/images\/national\/fullrz_3_4e81fa75ceba5_mywebpage.JPG'>"
}

Answer 1

That’s not valid JSON — all strings must be inside double quotation marks, including names. If you fix your server so that it outputs

{
"message": "<p style=\"color:#FFFFFF;font-family:'Century Gothic',futura,'URW Gothic L',Verdana,sans-serif;\">Welcome!<\/p><p style=\"color:#FFFFFF;font-family:'Century Gothic',futura,'URW Gothic L',Verdana,sans-serif;\">Check out today's Dinner and Lunch specials below!<\/p>",
"nationalad": "<img src='http:\/\/www.mywebpage.com\/images\/national\/fullrz_3_4e81fa75ceba5_mywebpage.JPG'>"
}

(note that both message and nationalad are inside double quotation marks), SBJSON should be able to parse your JSON string.

There’s another issue, though: your server isn’t returning an array — it’s returning a single object instead. Either fix your server code so that it returns an array of objects or, in your client code, parse a single object:

NSDictionary *status = [parser objectWithString:json_string error:nil];

Also, note that by using nil in

NSArray *statuses = [parser objectWithString:json_string error:nil];

you’re effectively telling the JSON parser not to return an error object in case there’s an error. Ignoring errors is usually a bad idea. You could do something like this:

NSError *jsonParseError;
NSArray *statuses = [parser objectWithString:json_string error:&jsonParseError];
if (!statuses) {
    // there's been a parse error; look at jsonParseError
    // for example:
    NSLog(@"JSON parse error: %@", jsonParseError);
}

or this:

NSError *jsonParseError;
NSDictionary *status = [parser objectWithString:json_string error:&jsonParseError];
if (!status) {
    // there's been a parse error; look at jsonParseError
    // for example:
    NSLog(@"JSON parse error: %@", jsonParseError);
}