NSString* aStr;
aStr = [[NSString alloc] initWithData:aData encoding:NSASCIIStringEncoding];

NSData* aData;
aData = [aStr dataUsingEncoding: NSASCIIStringEncoding];

 
//
//  GameKitTestViewController.h
//  GameKitTest
//
//  Created by Gavi Narra on 6/16/09.
//  Copyright ObjectGraph LLC 2009. All rights reserved.
//
 
#import <UIKit/UIKit.h>
#import <GameKit/GameKit.h>
 
@interface GameKitTestViewController : UIViewController<GKPeerPickerControllerDelegate,GKSessionDelegate> {
	GKPeerPickerController *mPicker;
	GKSession *mSession;
	IBOutlet UITextField *mTextField;
	IBOutlet UITextView *mTextView;
	NSMutableArray *mPeers;
}
 
-(IBAction) connectClicked:(id)sender;
-(IBAction) sendData:(id)sender;
@property (retain) GKSession *mSession;
 
@end

//
//  GameKitTestViewController.m
//  GameKitTest
//
//  Created by Gavi Narra on 6/16/09.
//  Copyright ObjectGraph LLC 2009. All rights reserved.
//
 
#import "GameKitTestViewController.h"
 
@implementation GameKitTestViewController
 
@synthesize mSession;
 
 
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}
*/
 
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
 
 
 
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
 
	mPicker=[[GKPeerPickerController alloc] init];
	mPicker.delegate=self;
	mPicker.connectionTypesMask = GKPeerPickerConnectionTypeNearby | GKPeerPickerConnectionTypeOnline;
	mPeers=[[NSMutableArray alloc] init];
}
 
 
 
 
 
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
 
- (void)didReceiveMemoryWarning {
	// Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
 
	// Release any cached data, images, etc that aren't in use.
}
 
- (void)viewDidUnload {
	// Release any retained subviews of the main view.
	// e.g. self.myOutlet = nil;
}
 
 
- (void)dealloc {
	[mPeers release];
    [super dealloc];
}
 
#pragma mark Events
 
-(IBAction) connectClicked:(id)sender{
//Show the connector
	[mPicker show];
}
 
#pragma mark PeerPickerControllerDelegate stuff
 
/* Notifies delegate that a connection type was chosen by the user.
 */
- (void)peerPickerController:(GKPeerPickerController *)picker didSelectConnectionType:(GKPeerPickerConnectionType)type{
	if (type == GKPeerPickerConnectionTypeOnline) {
        picker.delegate = nil;
        [picker dismiss];
        [picker autorelease];
		// Implement your own internet user interface here.
    }
}
 
/* Notifies delegate that the connection type is requesting a GKSession object.
 
 You should return a valid GKSession object for use by the picker. If this method is not implemented or returns 'nil', a default GKSession is created on the delegate's behalf.
 */
- (GKSession *)peerPickerController:(GKPeerPickerController *)picker sessionForConnectionType:(GKPeerPickerConnectionType)type{
 
	//UIApplication *app=[UIApplication sharedApplication];
	NSString *txt=mTextField.text;
 
	GKSession* session = [[GKSession alloc] initWithSessionID:@"gavi" displayName:txt sessionMode:GKSessionModePeer];
    [session autorelease];
    return session;
}
 
/* Notifies delegate that the peer was connected to a GKSession.
 */
- (void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session{
 
	NSLog(@"Connected from %@",peerID);
 
	// Use a retaining property to take ownership of the session.
    self.mSession = session;
	// Assumes our object will also become the session's delegate.
    session.delegate = self;
    [session setDataReceiveHandler: self withContext:nil];
	// Remove the picker.
    picker.delegate = nil;
    [picker dismiss];
    [picker autorelease];
	// Start your game.
}
 
-(IBAction) sendData:(id)sender{
 
	NSString *str=@"Hello SaiBaba";
	[mSession sendData:[str dataUsingEncoding: NSASCIIStringEncoding] toPeers:mPeers withDataMode:GKSendDataReliable error:nil];
}
 
- (void) receiveData:(NSData *)data fromPeer:(NSString *)peer inSession: (GKSession *)session context:(void *)context
{
    // Read the bytes in data and perform an application-specific action.
 
	NSString* aStr;
	aStr = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
	NSLog(@"Received Data from %@",peer);
	mTextView.text=aStr;
 
 
}
 
/* Notifies delegate that the user cancelled the picker.
 */
- (void)peerPickerControllerDidCancel:(GKPeerPickerController *)picker{
 
}
 
#pragma mark GameSessionDelegate stuff
 
/* Indicates a state change for the given peer.
 */
- (void)session:(GKSession *)session peer:(NSString *)peerID didChangeState:(GKPeerConnectionState)state{
 
	switch (state)
    {
        case GKPeerStateConnected:
		{
			NSString *str=[NSString stringWithFormat:@"%@\n%@%@",mTextView.text,@"Connected from pier ",peerID];
			mTextView.text= str;
			NSLog(str);
			[mPeers addObject:peerID];
			break;
		}
        case GKPeerStateDisconnected:
		{
			[mPeers removeObject:peerID];
 
			NSString *str=[NSString stringWithFormat:@"%@\n%@%@",mTextView.text,@"DisConnected from pier ",peerID];
			mTextView.text= str;
			NSLog(str);
			break;
		}
    }
}
 
@end