Comments on: iPhone Coding Tutorial – Creating an Online Leaderboard For Your Games

By: srz2

srz2 — Tue, 05 Mar 2013 23:38:00 +0000

do you have a method to return data from the MySQL database (maybe through php) that you can use instead of using a UIWebView? For instance, if I wanted to pull the information from a specific person and then display that in a UIViewController, how would i do that?

By: Aaa

Aaa — Fri, 20 Jan 2012 13:59:00 +0000

Nice tutorial,, brief and clear!
Thanks!

By: bob

bob — Thu, 29 Dec 2011 09:14:00 +0000

Hi, I am having issues with this tutorial. Â I have my database made and it shows username and score. I have addedÂ Â Â [self submitScore:score username:usernameTextbox.text]; to a button and added a corresponding textfield. Â However, when I press the button and the uiwebview pops up I just see an empty table with the column titles ‘username’ and ‘password’ the table created from the database). Â I don’t know why the data (username from textfield and score) isn’t being sent to the database?

By: Marcelo

Marcelo — Mon, 04 Apr 2011 21:52:00 +0000

Thank you very much!!!

By: web application developers

web application developers — Wed, 23 Feb 2011 13:23:00 +0000

very useful programs. Thanks for this. Very clear and helpful tutorial, good work!

By: Scott

Scott — Thu, 10 Feb 2011 09:53:00 +0000

Hate to say this, but where is the rest of the tutorial?

I read through it before your new site upgrade, and now I’m starting it, the pages are broken…

Any help with this?

By: Joel

Joel — Mon, 07 Feb 2011 12:59:59 +0000

And I forgot a parentes:
if($phpHash != $hash) {

By: Joel

Joel — Mon, 07 Feb 2011 12:58:02 +0000

Goddamnit:

#import [bracket]CommonCrypto/CommonDigest.h[bracket]

By: Joel

Joel — Mon, 07 Feb 2011 12:55:47 +0000

Utilities.m is supposed to import:

#import

By: Joel

Joel — Mon, 07 Feb 2011 12:46:54 +0000

Thank you very much for this excellent project! I tweaked your code a little bit so that it got more safe, using MD5 hash.

Objective-C:

Utilities.h
@interface NSString (md5)


- (NSString *) MD5;

@end

Utilities.m
#import


@implementation NSString (md5)
- (NSString *) MD5

{

	const char *cStr = [self UTF8String];

	unsigned char result[16];

	CC_MD5( cStr, strlen(cStr), result );

	return [[NSString stringWithFormat:

			@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",

			result[0], result[1], result[2], result[3],

			result[4], result[5], result[6], result[7],

			result[8], result[9], result[10], result[11],

			result[12], result[13], result[14], result[15]

			] lowercaseString];

}

@end

Leaderboard.m:
#import "Utilities.h" ... NSString *secret = @"some_secret";


NSString *hash = [[NSString alloc] initWithFormat:

				  @"%@%@%f", secret, udid, theScore];

hash = [hash MD5];

NSString *urlString = [NSString stringWithFormat:@"http://icodeblog.com/ws/put_score.php?hash=%@&udid=%@&name=%@&score=%f" hash,udid,username,theScore];

PHP:

put_score.php
$secret = "some_secret";


$udid   = isset($_GET['udid']) ? $_GET['udid'] : "";

$name   = isset($_GET['name']) ? $_GET['name']  : "";

$score  = isset($_GET['score']) ? $_GET['score'] : "";

$hash  = isset($_GET['hash']) ? $_GET['hash'] : "";
$udid  = mysql_real_escape_string($udid);

$name  = mysql_real_escape_string($name);

$score = mysql_real_escape_string($score);

$hash = mysql_real_escape_string($hash);
$phpHash = $secret . $udid . $score;

$phpHash = md5($phpHash);

if($phpHash != $hash { die('Nothing to see here...'); }

I hope this help someone!

Best regards,
Joel