Post data in Objective C using Json

Question

I am trying to post data to a PHP web service.
I am familiar doing this in html using query $.post but I am very much stumped trying this in objective C. I tried several

Answer 1

I have run your code, and server side receive all message.

POST / HTTP/1.1
Host: linux-test
User-Agent: demoTest/1.0 CFNetwork/548.1.4 Darwin/11.3.0
Content-Length: 44
Accept: application/json
Content-Type: application/json
Accept-Language: en
Accept-Encoding: gzip, deflate
Connection: keep-alive

{"Email":"test@test.com","FirstName":"test"}

And follow code, if jsonRequest has Non-ASCII characters， the [jsonRequest length] will be wrong.

NSData *requestData = [NSData dataWithBytes:[jsonRequest UTF8String] length:[jsonRequest length]];

You can use strlen instead.

NSData *requestData = [NSData dataWithBytes:[jsonRequest UTF8String] length:strlen([jsonRequest UTF8String])];

or

[jsonRequest dataUsingEncoding:NSUTF8StringEncoding];

Answer 2

Try this one

NSData *requestData = [jsonRequest dataUsingEncoding:NSUTF8StringEncoding];

Answer 3

NSURL *url=[NSURL URLWithString:[NSString stringWithFormat:@"%@posts", SeverURL]];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"POST"];
[request addRequestHeader:@"content-type" value:@"application/json"];
[request addRequestHeader:@"User-Agent" value:@"iOS"];

request.allowCompressedResponse = NO;
request.useCookiePersistence = NO;
request.shouldCompressRequestBody = NO;
request.delegate=self;
NSString *json=[[self prepareData] JSONRepresentation];//SBJSON lib, convert a dict to json string
[request appendPostData:[NSMutableData dataWithData:[json dataUsingEncoding:NSUTF8StringEncoding]]];

[request startSynchronous];

Answer 4

I think you would be better off using the NSJSONSerialization class like this:

NSDictionary *tmp = [[NSDictionary alloc] initWithObjectsAndKeys:
                     email, @"Email",
                     fname, @"FirstName",
                     nil];
NSError *error;
NSData *postdata = [NSJSONSerialization dataWithJSONObject:tmp options:0 error:&error];
[request setHTTPBody:postData];

Using a dictionary and then converting it to JSON it's easier than creating it like a string.

Good luck!

[SWIFT 3.0] (update)

let tmp = ["email": email,
           "FirstName": fname]
let postData = try? JSONSerialization.data(withJSONObject: tmp, options: .prettyPrinted)
request.httpBody = postData