Socket Programming in Objective-C - objective-c

Question

currently I am wanting to program a chat server. I am having trouble really understanding the documentations though.
Currently, this is my code, basically extracted from the developer library:
#import "ServerSide.h"
#implementation ServerSide
#synthesize socket;
#synthesize socketAddress;
#synthesize handleConnect;
#synthesize portNumber;
- (id)init{
self = [super init];
if (self) {
self.socket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketAcceptCallBack, handleConnect, NULL);
}
return self;
}
- (void) bind {
memset(&socketAddress, 0, sizeof(socketAddress));
socketAddress.sin_len = sizeof(socketAddress);
socketAddress.sin_family = AF_INET; /* Address family */
socketAddress.sin_port = htons(self.portNumber); /* Or a specific port */
socketAddress.sin_addr.s_addr= INADDR_ANY;
CFDataRef sincfd = CFDataCreate(kCFAllocatorDefault, (UInt8 *)&socketAddress, sizeof(socketAddress));
CFSocketSetAddress(socket, sincfd);
CFRelease(sincfd);
}
- (void) listen {
CFRunLoopSourceRef socketsource = CFSocketCreateRunLoopSource(kCFAllocatorDefault, socket, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), socketsource, kCFRunLoopDefaultMode);
CFSocketGetNative(socket);
}
Now, 'handleconnect' is a CFSocketCallBack ivar with no initialization.
Now I have seen others use different implementations to creating a socket server but this was the one from the docs and I would like to build on top of that.
I am currently attempting to connect to the server but it looks like this doesn't even open a socket. I can't seem to connect to it through terminal using telnet localhost 'port#' either.
Heres the client implementation:
#import "Client.h"
#implementation Client
#synthesize host;
#synthesize port;
#synthesize readStream;
#synthesize writeStream;
#synthesize inputStream;
#synthesize outputStream;
- (void)setup {
NSLog(#"Setting up connection to %# : %i", [[NSURL URLWithString:host] absoluteString], port);
CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, (__bridge CFStringRef)[[NSURL URLWithString:host] host], port, &readStream, &writeStream);
if(!CFWriteStreamOpen(writeStream)) {
NSLog(#"Error, writeStream not open");
return;
}
}
- (void)open {
NSLog(#"Opening streams.");
inputStream = (__bridge_transfer NSInputStream *)readStream;
outputStream = (__bridge_transfer NSOutputStream *)writeStream;
[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];
}
- (void)close {
NSLog(#"Closing streams.");
[inputStream close];
[outputStream close];
[inputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream setDelegate:nil];
[outputStream setDelegate:nil];
inputStream = nil;
outputStream = nil;
}
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)event {
NSLog(#"Stream triggered.");
switch(event) {
case NSStreamEventHasSpaceAvailable: {
if(stream == outputStream) {
NSLog(#"outputStream is ready.");
}
break;
}
case NSStreamEventHasBytesAvailable: {
if(stream == inputStream) {
NSLog(#"inputStream is ready.");
uint8_t buf[1024];
unsigned int len = 0;
len = (int)[inputStream read:buf maxLength:1024];
if(len > 0) {
NSMutableData* data=[[NSMutableData alloc] initWithLength:0];
[data appendBytes:(const void *)buf length:len];
[self readIn:[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]];
data = nil;
}
}
break;
}
default: {
NSLog(#"Stream is sending an Event: %lu", event);
break;
}
}
}
- (void)readIn:(NSString *)s {
NSLog(#"Reading in the following:");
NSLog(#"%#", s);
}
- (void)writeOut:(NSString *)s {
uint8_t *buf = (uint8_t *)[s UTF8String];
[outputStream write:buf maxLength:strlen((char *)buf)];
NSLog(#"Writing out the following:");
NSLog(#"%#", s);
}
#end
I run the server on a specified port, then tell the client to connect to the specified host and port number.
But now how do I pass data in the socket I have opened...
I don't expect some large explanation, but if someone could give me a better understanding of what needs to be done to further this implementation, I'd greatly appreciate it.