problems getting data from localhost:8888 in objective c using json - php

Question

I am trying to use a server for the first time.
I have downloaded MAMP and have a local sever on my mac http://localhost:8888
I have a php file jsontest.php that shows my data from a SQL database
<?php
// Database credentials
$host = 'localhost';
$db = 'json';
$uid = 'json';
$pwd = 'json1';
// Connect to the database server
$link = mysql_connect($host, $uid, $pwd) or die("Could not connect");
//select the json database
mysql_select_db($db) or die("Could not select database");
// Create an array to hold our results
$arr = array();
//Execute the query
$rs = mysql_query("SELECT id,userid,firstname,lastname,email FROM users");
// Add the rows to the array
while($obj = mysql_fetch_object($rs)) {
$arr[] = $obj;
}
echo '{"users":'.json_encode($arr).'}';
?>
When i go to to http://localhost:8888/jsontest.php (the jsontest.php file is stored in MAMP/htdocs) I can see my data:
{"users":[{"id":"1","userid":"fhardy","firstname":"Frank","lastname":"Hardy","email":"fhardy#hauntedclock.com"},{"id":"2","userid":"jhardy","firstname":"Joe","lastname":"Hardy","email":"jhardy#hauntedclock.com"},{"id":"3","userid":"ndrew","firstname":"Nancy","lastname":"Drew","email":"ndrew#hauntedclock.com"},{"id":"4","userid":"sdoo","firstname":"Scooby","lastname":"Doo","email":"sdoo#mysterymachine.com"}]}
I then use the following objective c code to read from this server:
NSURL *url = [NSURL URLWithString:#"http://localhost:8888/jsontest.php"];
NSData *data = [NSData dataWithContentsOfURL:url];
jsonArray = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]; //
NSLog(#"jsonArray: %#", jsonArray);
But the app crashes with the error
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil'
I know the error is coming from my server as it works with the server from a tutorial. But i cannot get it to work with my local server on my mac. I have tried using just http://localhost/jsontest.php but it still doesn't work.
Any help would be greatly appreciated.

Answer 1

Instead of localhost, put your IP.
That's it...
This is how you will get your local IP.
Also check this