Convert Return String from PHP into JSON Object

Question

I have an HTTP Post request that returns a JSON object. I can view the return value as a string and it is perfect. What I am stuck on is converting this return value into something that can be parsed as a JSON object. I'm not sure of the conceptual steps, much less the code that I should be writing.

Here is the code that I have. It crashes the JSON serialization line because the line before it where I attempt to convert the return string into NSData results in a nil value. Not even sure if I need this step, but I can't find a successful solution.

Can anyone tell me what I am doing wrong? Thanks!

- (void) finished: (NSNotification *) n
{
    MyDownloader *d = [n object];
    NSData *data = nil;
    if ([n userInfo]) {
        NSLog(@"information retrieval failed");
    } else {
        data = d.receivedData;
        NSString *text=[[NSString alloc]initWithData:d.receivedData encoding:NSUTF8StringEncoding];
        NSLog(@"%@", text);

        NSData *data = [NSData dataWithContentsOfFile:text];
        self.response = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

        if (self.response)
            [self parseJSONObject];
        else NSLog(@"The server has responded with something other than a JSON formatted object");
    }

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name: @"connectionFinished"
                                                  object:d];

}

Alexis King · Accepted Answer · 2014-01-02 20:09:57Z

1

You're using dataWithContentsOfFile, which is trying to load the data from a file in your local filesystem. Use this instead:

NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];

However, as @MartinR points out, there's no need to convert d.recievedData to a string and then back to data. Just use it directly.

NSData *data = d.recievedData;

answered Jan 2, 2014 at 20:09

Alexis King

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3 Comments

Martin R Over a year ago

Even that is not necessary, because d.receivedData already contains the JSON data. No need to convert it to a string and back.

AndroidDev Over a year ago

@Jake King - your solution worked. @Martin R - can you please suggest a line of code where I can directly use d.receivedData? This is the part that I am hung up on - how to get from my received data into something that I can parse. Thanks to you both!

Martin R Over a year ago

self.response = [NSJSONSerialization JSONObjectWithData:d.receivedData ...

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