json data custom http request

Question

So far all I've been working with is receiving data from an restAPI using json in objective-c (using SBJson classes). I am now attempting to send post data but I have no experience with it. The raw body looks something like the following:

  //http://www.myapi.com/api/user=123
  "Username": "foo",
  "Title": null,
  "FirstName": "Nick",
  "MiddleInitial": null,
  "LastName": "Foos",
  "Suffix": null,
  "Gender": "M",
  "Survey": {
         "Height": "4'.1\"",
         "Weight": 100,
               }

What would be the best way this type of data?

danh · Accepted Answer · 2013-02-13 16:49:00Z

1

Let's say you have the post data in a string, called myJSONString. (Getting from Objective-C collections to the json is straight-forward too. Looks like @Joel answered that).

// build the request
NSURL *url = [NSURL urlWithString:@"http://www.mywebservice.com/user"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";

// build the request body
NSData *postData = [myJSONString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
[request setHTTPBody:postData];
[request setValue:[NSString stringWithFormat:@"%d", [postData length]] forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

// run the request
[NSURLConnection sendAsynchronousRequest:request
                                   queue:[NSOperationQueue mainQueue]
                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                           if (!error) {
                               // yay
                           } else {
                               // log the error
                           }
                       }];

answered Feb 13, 2013 at 16:49

danh

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2 Comments

bardockyo Over a year ago

Thank you for your response. I've got a question. I am also having to send a unique key as a customer header. How would I go about sending that as well?

danh Over a year ago

Sure. [request setValue:@"value" forHTTPHeaderField:@"key"];

Joel · Accepted Answer · 2013-02-13 16:45:52Z

1

You want a dictionary with entries for each key above, then convert the dictionary to a JSON string. Note that the Survey key is a dictionary itself. Something like this.

NSMutableDictionary *dictJson= [NSMutableDictionary dictionary];
[dictJson setObject:@"foo" forKey:@"Username"];
...
[dictJson setObject:dictSurvey forKey:@"Survey"];

//convert the dictinary to a JSON string
NSError *error = nil;
SBJsonWriter *jsonWriter = [[SBJsonWriter alloc] init];
NSString *result = [jsonWriter stringWithObject:dictJson error:&error];
[jsonWriter release];

answered Feb 13, 2013 at 16:45

Joel

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1 Comment

bardockyo Over a year ago

Thanks so much for the response. I had no idea how to approach the surveys dict. This will def work.

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