Created
May 31, 2011 22:59
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gamekit packets
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| /** Types of packets sent by session. */ | |
| typedef enum { | |
| PacketTypeStart, /**> packet to notify games to start. */ | |
| PacketTypeRequestSetup, /**> server wants client info. */ | |
| PacketTypeSetup, /**> send client info to server. */ | |
| PacketTypeSetupComplete, /**> round trip made for completion. */ | |
| PacketTypeTurn, /**> packet to notify game that a turn is up. */ | |
| PacketTypeRoll, /**> packet to send roll to players. */ | |
| PacketTypeEnd, /**> packet to end game. */ | |
| PacketTypeHeartbeat, /**> packet to attempt to keep peers alive. */ | |
| PacketTypeRematch, /**> packet to send a rematch message to peers. */ | |
| PacketTypeAvatars /**> sending packet containing player images. */ | |
| } PacketType; | |
| ////// | |
| // sends data to the connected peers | |
| - (void)sendPacket:(NSData *)data ofType:(PacketType)type | |
| { | |
| NSMutableData *newPacket = [NSMutableData dataWithCapacity:([data length]+sizeof(uint32_t))]; | |
| // Data is prefixed with the PacketType so the peer knows what to do with it. | |
| uint32_t swappedType = CFSwapInt32HostToBig((uint32_t)type); | |
| [newPacket appendBytes:&swappedType length:sizeof(uint32_t)]; | |
| [newPacket appendData:data]; | |
| // Send data checking for success or failure | |
| NSError *error; | |
| BOOL didSend = [_gkSession sendDataToAllPeers:newPacket withDataMode:GKSendDataReliable error:&error]; | |
| if (!didSend) | |
| { | |
| NSLog(@"error in sendDataToPeers: %@", error); | |
| } | |
| } | |
| // handles data sent to peers | |
| - (void)receiveData:(NSData *)data fromPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context | |
| { | |
| PacketType header; | |
| uint32_t swappedHeader; | |
| if ([data length] >= sizeof(uint32_t)) | |
| { | |
| // chop off the packet type header | |
| [data getBytes:&swappedHeader length:sizeof(uint32_t)]; | |
| // convert it to our packet type | |
| header = (PacketType)CFSwapInt32BigToHost(swappedHeader); | |
| // range of data minus the packet type flag | |
| NSRange payloadRange = {sizeof(uint32_t), [data length]-sizeof(uint32_t)}; | |
| // the data itself | |
| NSData *payload = [data subdataWithRange:payloadRange]; | |
| // figure out the message sent | |
| NSString *message = [[[NSString alloc] initWithData:payload encoding:NSUTF8StringEncoding] autorelease]; | |
| if (header == PacketTypeStart) | |
| { | |
| // do something with message | |
| } | |
| } | |
| } | |
| ///////// | |
| // using it | |
| NSString *data = "Some string to send"; | |
| // has to be NSData | |
| NSData *packet = [data dataUsingEncoding:NSUTF8StringEncoding]; | |
| [self sendPacket:packet ofType:PacketTypeStart] |
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