[Syphor]

Hey all,
In my app I'm using smallsockets v0.9 to communicate over a tcp/ip network. Though I've run into a problem.
I'm sending data using the socket function

- (void)writeDataNSData*)data

and I read the incomming data with the function

- (int)readDataNSMutableData*)data

Though for exampl if i send 2 pieces of data in one function straight after eachother the other end recieves these data items as 1 data item.

eg.

Code:
[socket writeData:myData];
[socket writeData:yourData];

;
-------

Code:
[socket readData:response];
NSLog(@"%@", response);

;

You would expect his to output something like

[TestApp]:: <1234 1234 1234>
[TestApp]:: <1234 1234 1234>

Though unfortunatly it outputs this:

[TestApp]:: <1234 1234 1234> <1234 1234 1234>

Any help would be appreciated

[ambush]

Sup Syphor, I take it no one could help you with this problem @ spymac

Well I use some kind of spiffy threaded version of SmallSockets I coded, and, well I *had* (for 10 mins ) the same problem.

It's all in the packet structure.

For instance, I use this structure (notice the fixed lengths)

[__] [_] [_....................]

[packet length as unsigned short (2 bytes)] [packet type as char (1 byte)] [packet contents as char array (undefined amount of bytes, max would theorically be the max value of an unsigned short, which is 65,535).]

Also, I have an object, SGPacket and its subclass, (all the possible other types) SGResetPacket, SGChatPacket, etc.....

After receiving the data, I take the data and call the -packets message on it.

But wait, that's not in the regular NSData instance methods, you're right, I made one extension.

Code:
@interface NSData (NSData+SGPacketsAdditions)
- (NSArray *)packets; // That returns an array of SGPackets contained in receiver's content
@end

So I call -packets on it, and it returns an array of packets, and I treat the one by one with my handlePacket method.

But. How do I know how many packets there are?

It's easy, but you know that (given that the packet is not malformed) the first 2 bytes of the data you'll receive indicate the LENGTH of the first packet. So you calculate where it stops, and take those bytes, init a NSData with them, and pass them to your Packet object. Something like

Code:
+ (SGPacket *)packetWithData:(NSData *)data

for each packet.

Now, it is SGPacket's responsibility to analyze the data, of course, and return the right SGPacket subclass.

I'm not a network expert, but I think this is how it should act. Please, correct me if I'm wrong, I'm about to ship my app

PS: Where did you find SmallSockets 0.9???????

[Syphor]

Wow, I would love to have that spiffy threaded version of smallsockets... if u can could u please email it to syphor@mac.com

P.S. I meant version 0.6