Gamekit and iPhone - ios

Question

I have my app set up to send a custom level in a form of a array to another person during a p2p connection. The receiving device saves the array to file for later use. I set up gamekit in my application, it will successfully search and connect to another device without any problems. Though a problem arises when I send data to a device, the receiving device will receive the data (and save the custom level like it should) but it will immediately crash afterwords.
Here are my methods that I use to send and receive data.
-(void) sendDataToPeers:(NSData *) data
{
if (currentSession)
{
//send the data
[self.currentSession sendDataToAllPeers:data withDataMode:GKSendDataReliable error:nil];
//Alerting the user that the custom level has been sent.
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Sent!" message:#"Your custom level has been sent." delegate:self cancelButtonTitle:#"Close" otherButtonTitles:nil];
[alert show];
[alert release];
}
}
-(void) btnSend
{
//Data that will be sent
NSMutableData *theData = [NSMutableData data];
//Archiver
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:theData];
//Desired level to send
int theLevel =[[CTManager sharedInstance]getLevel];
//Path to the custom levels
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory=[paths objectAtIndex:0];
NSString *customLevelsSen = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat:#"customLevels"]];
//Custom levels array
NSArray *theLevels = [[NSArray alloc] initWithContentsOfFile: customLevelsSen];
//Gets the desired level array from array of custom levels
NSArray *myArray = [[NSArray alloc]initWithArray:[theLevels objectAtIndex:theLevel-51]];
//prepare data
[archiver encodeObject:myArray forKey:#"level"];
[archiver finishEncoding];
//send the data
[self sendDataToPeers:theData];
//cleanup
[archiver release];
[theLevels release];
[myArray release];
}
-(void) receiveData:(NSData *)data fromPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context
{
//Archiver
NSKeyedUnarchiver *archiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
//Gets the custom level in form of an array from data.
NSArray *level = [archiver decodeObjectForKey:#"level"];
[archiver finishDecoding];
[archiver release];
//Path to the array of custom levels
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory=[paths objectAtIndex:0];
NSString *customLevelsRec = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat:#"customLevels"]];
//Gets the array of custom levels
NSMutableArray *customLevelArray = [[NSMutableArray alloc] initWithContentsOfFile:customLevelsRec];
//Adds a new array to the array of custom levels
[customLevelArray addObject:level];
//Saves the array.
[customLevelArray writeToFile:customLevelsRec atomically:YES];
//cleanup
[customLevelArray release];
//Message saying a custom level has been recieved
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Received!" message:#"A custom level has been saved." delegate:self cancelButtonTitle:#"Close" otherButtonTitles:nil];
[alert show];
[alert release];
}
Testing this has been a pain since I don't have two devices of my own currently, so I send a beta build to my friend who inturns tests them (he has ipod and iphone). Any help with this is appreciated...
If I can't find the problem I will most likely send the entire xcode project to him and via screen share work with the project on his computer to efficiently build and test the application. And I will be able to use debug mode.

Answer 1

I don't know if you ever found an answer to this question or not, I hope you did. But if you didn't I highly recommend that you try the new features of the new SDK. Instead of going through the whole encode/decode process, they have made it simple by having you do the following (in your send methodology):
data = [NSKeyedArchiver archivedDataWithRootObject:anObject];
where anObject can be pretty much any object, array, dictionary, whatever...
In your receive methodology:
NSObject *object = [NSKeyedUnarchiver unarchiveObjectWithData:data];
where object can also be pretty much any object.
As far as the crash you are experiencing, have you verified on which line the crash occurs? Are you sure it happens in the code you posted? Or is it happening somewhere else?

Answer 2

I don't see anything wrong in your receiveData method.
Have you checked that the folder where you are trying to save the data (customLevels) exists?
I have succeeded to connect via an application using GameKit a device and the iPhone simulator. It's really handy to debug.
I haven't check if it was by bluetooth or wifi.

Answer 3

NSData* data = [#"TEXT" dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
[self.session sendData:data toPeers:peerID withDataMode:GKSendDataReliable error:&error];
(void) receiveData:(NSData *)data fromPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context {
NSString* message = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];//#"TEXT"
NSString* nameOfTheTransmitter = [session displayNameForPeer:peer];// name who sent
}