To help on the development of peer to peer apps on the iPhone, I developed an abstraction on GKSession called NetworkProxy. To use it, we just create a new instance of a NetworkMessage:
NetworkMessage* message = [[[NetworkMessage alloc] init] autorelease];
Set it’s message type and any other (optional) information we may want to transmit:
[message setMessageType:NetworkMessageType_FinalScore];
[message setScore:35];
[message setMessage:@"Text to send goes here!"];
And send it:
[networkProxy sendMessage:message];
NetworkProxy is the class that does the heavy work. It is initialized with a connected GKSession:
@implementation NetworkProxy
-(id) initWithSession:(GKSession*) msession
{
…
return self;
}
And expects a INetworkClient to be injected, to be able to handle incoming messages:
-(void) setClient:(id<INetworkClient>) mnetworkClient
{
networkClient = [mnetworkClient retain];
}
Inheriting INetworkClient means implementing two methods, one to handle incoming messages and one for network errors:
@protocol INetworkClient <NSObject>
@required
-(void) messageReceived:(NetworkMessage*) data;
-(void) networkError;
@end
Incoming messages should be pretty straight forward:
-(void) messageReceived:(NetworkMessage*) data
{
switch ([data messageType]) {
case NetworkMessageType_GameStarting:
…
break;
case NetworkMessageType_Click:
…
break;
case NetworkMessageType_FinalScore:
…
break;
default:
break;
}
}
If you’re planning on using the code start by checking the NetworkMessage class. That’s where the magic (with some help from NSCoder) is.
Start by adding your own message types:
typedef enum {
NetworkMessageType_GameStarting = 0,
NetworkMessageType_Click = 1,
NetworkMessageType_FinalScore = 2,
NetworkMessageType_SendBomb = 3
} NetworkMessageType;
And be sure to un/serialize them properly:
- (id)initWithCoder:(NSCoder *)coder
{
self = [super init];
[coder decodeValueOfObjCType:@encode(NSInteger) at:&messageType];
[coder decodeValueOfObjCType:@encode(NSInteger) at:&score];
return self;
}
- (void)encodeWithCoder:(NSCoder *)coder
{
[coder encodeValueOfObjCType:@encode(NSInteger) at:&messageType];
[coder encodeValueOfObjCType:@encode(NSInteger) at:&score];
}
Of course, you can have your NetworkMessage with complex objects as attributes, just make sure they also implement NSCoder.
Code here.
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• O teclado é excelente mas… o facto de ainda não ter Português é extremamente frustrante! Imaginem que cada palavra que escrevo o corrector ortográfico ‘corrige-me’ algo com parecido em inglês…
