Comments inline.
On Jul 13, 2009, at 10:29 PM, James Lin wrote:
Hi all...
Continuing on with my network between 2 iPhone quest...
Thanks to Luke who made me aware of Game Kit and GKVoiceChat.
As I am new to network programming, I need you to help me make sense
of the documentation.
If I am reading the GKVoiceChat documentation
correctly...GKVoiceChat works in the following manner:
1. provide each client with an arbitrary participant ID and try to
connect through GKVoiceChatService (is it a server/service provided
by Apple?), and
the service will allow the 2 iPhones to discover each other and make
connection?
When using voice chat, the connection is entirely handled by your
code. The voice chat service simply handles the audio input and output
and packetizing of the audio for transmission and receipt. The
connection and sending is all your job.
2. Session can be created over Bonjour service. Can i create a
"Session" object from the participantID that I provide for the two
iPhones?
In this case, session does not refer to an object. Session is a
generic term referring to whatever network setup your code has created.
3. There is a method called
voiceChatService:sendData:toParticipantID: as part of the protocol.
The documentation says:
Implement the client’s voiceChatService:sendData:toParticipantID:
method.
- (void)voiceChatService:(GKVoiceChatService *)voiceChatService
sendData:(NSData
*)data toParticipantID:(NSString *)participantID
{
[session sendData: data toPeer:[NSArray arrayWithObject:
participantID]
withDataMode: GKSendDataReliable error: nil];
}
The service calls the client when it needs to send data to other
participants in the chat. Most commonly,
it does this to establish its own real-time connection with other
participants. As both the GKSession
and GKVoiceChatService use an NSData object to hold their data,
simply pass it on to the session.
If the same network is being used to transmit your own information,
you may need to add an identifier
before the packet to differentiate your data from voice chat data.
Does this mean I can also send my own data over the internet through
this service once a voicechat connection is made?'
This is not a data send service, as covered above. The networking code
is entirely up to you. Once you've established your own connection
code, you could easily tailor it to hand whatever data you want to
send, but the voice chat API won't help with that.
4. Anyone know if sample code is available anywhere on the net for
GKVoiceChat?
5. In the Game Kit Programming Guide documentation, it mentioned two
methods
voiceChatService:sendData:toParticipantID:
voiceChatService:sendRealTimeData:toParticipantID:
However, these two methods are mysteriously missing from the
GKVoiceChatService Class documentation.
Am I missing something?
If I am reading the documentation correctly: does this mean I can
use the GKVoiceChatService that discovered each through
the service and SEND MY OWN DATA between the two iPhones?
No. These methods only inform you that packetized audio code is ready
to be sent and asks you to send it on behalf of the voice chat
service. As noted above, the sending is your business.
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