how to print barcode in vb.net 2008 Creating peer-to-peer applications using the peer picker in Objective-C

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Creating peer-to-peer applications using the peer picker
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the Game Kit/Gamekit.h header file in every project file that you wish to use the Game Kit functionality. The GKPeerPickerController is simple to implement. You initialize it, set its delegate, and show it. Here s an example of displaying the GKPeerPickerController:
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- (void)viewDidLoad { [super viewDidLoad]; chatPicker = [[GKPeerPickerController alloc] init]; [chatPicker setDelegate:self]; [chatPicker setConnectionTypesMask:GKPeerPickerConnectionTypeNearby]; peers = [[NSMutableArray alloc] init]; } -(IBAction) connect { [chatPicker show]; }
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As you can see, it isn t much different than displaying a UIAlertView or UIActionSheet. Here, you initialize the picker inside the viewDidLoad method and show it when the user presses a connect button. This allows you to reuse the same picker in case the user wants to find a different peer or needs to reconnect in the event the connection gets dropped. Figure 15.1 shows what the peer-picker interface looks like when it s displayed.
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Figure 15.1 The peer-picker interface on both the iPhone and iPad. Using Bluetooth, users can connect to other nearby devices and interact in real time.
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Peer-to-peer connections using Game Kit
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One interesting variable you set is connectionTypeMask. It lets the picker know what type of peers it s searching for. The values you can use here are GKPeerConnectionTypeNearby and GKPeerConnectionTypeOnline. The value GKPeerConnectionTypeNearby is required by any application that wants to use Game Kit; it tells the application to look for peers over Bluetooth as well as the local wireless network. If this value isn t included, your application will throw an exception. The other value, GKPeerConnectionTypeOnline, tells the picker that you want to search for peers online. This requires some more complex networking knowledge that s out of the scope of this book. As usual, you set the delegate of the picker to self. This requires that the class implement the GKPeerPickerControllerDelegate interface. Table 15.1 describes the delegate methods in detail.
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Table 15.1
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GKPeerPickerControllerDelegate method descriptions
Delegate Method Description This optional method is called when the user selects a connection type. As noted previously, the possible connection types are GKPeerConnectionTypeNearby and GKPeerConnectionTypeOnline. This optional method is called when the controller requests a session. Implementing this method gives you greater control over the session, including the ability to customize the display name and session ID. This is an optional method but is expected to be implemented. It s called when a peer connects. At this point, you should dismiss the peer picker and take ownership of the session. This is another optional but expected method that s called when the user cancels the request. At this point, you notify the user that the session was cancelled.
peerPickerController:didSelectConnectionType:
peerPickerController:sessionForConnectionType:
peerPickerController:didConnectPeer:toSession:
peerPickerControllerDidCancel:
Although all the delegate methods are optional, it s a good idea to implement all of them in your application for greater control over the picker s actions. The last thing you do in the viewDidLoad method is to create an NSMutableArray of peers. You add peers to this array as they join. Keeping a reference to all connected peers is necessary when sending data to them. We ll discuss this in greater detail later in this section. Now that you ve created the picker, the next step is to implement these delegate methods. Listing 15.1 shows how you can implement each of these delegate methods.
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Creating peer-to-peer applications using the peer picker
Listing 15.1
GKPeerPickerControllerDelegate methods
- (void)peerPickerController:(GKPeerPickerController *)picker didSelectConnectionType:(GKPeerPickerConnectionType)type{ } - (void)peerPickerControllerDidCancel:(GKPeerPickerController *)picker{ NSLog(@"The connection was cancelled"); } - (void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session{ self.chatSession = session;
Localizes session to class
self.chatSession.delegate = self; [self.chatSession setDataReceiveHandler: self withContext:nil]; [chatPicker dismiss]; }
Hides picker Creates custom session
- (GKSession *)peerPickerController:(GKPeerPickerController *)picker sessionForConnectionType:(GKPeerPickerConnectionType)type{ GKSession* session = [[GKSession alloc] initWithSessionID:@"chatSession" displayName:@"Peer" sessionMode:GKSessionModePeer]; [session autorelease]; return session; }
The peerPickerController:didSelectConnectionType: method has no use in this application because you have only one connection type. If you added multiple connection types, you d do an if statement here and handle each connection type accordingly. The peerPickerControllerDidCancel: method isn t very interesting and is useful only to the developer. This method prints a message to the console notifying you that the connection was cancelled. Normally, you might want to do something like display an UIAlertView to do this. peerPickerController:didConnectPeer: does three things B. First, it sets the incoming session to the class s session property. This lets you use it in other methods. Next, the session s delegate is set to the class. Table 15.2 lists the session delegate methods that can be implemented. Finally, the dataReceiveHandler of the session is set to the class. This allows the class to receive network data sent to the session. In order to use the class as the session s dataReceiveHandler, you must implement the receiveData method. We ll discuss this method a little later in this section. When the picker has done its job and is no longer needed, you dismiss it C. The last method lets you to create a custom session D. If you didn t implement this method, a default session would be created for you. As you can see, you can specify a custom session ID as well as a display name. The session ID is used to differentiate the application s session from others that might be in the area. The display name is a custom name for a given peer. Think of it as a username. The next step is to implement the session delegate methods to manage the session.
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