WiFi connection - reading name

[freshking]

Hi,

im exploring the WiTap sample code and there is on thing i would like to do: I would like to read out the name of your network partner, once connect.

Here is a code snipped it think you can read it out from:

- (void)handleNewConnectionFromAddress: (NSData *)addr inputStream: (NSInputStream *)istr outputStream: (NSOutputStream *)ostr {

// if the delegate implements the delegate method, call it

if (self.delegate && [self.delegate respondsToSelector: @selector(didAcceptConnectionForServer: inputStream: outputStream: )]) {
[self.delegate didAcceptConnectionForServer: self inputStream: istr outputStream: ostr];

}
}

// This function is called by CFSocket when a new connection comes in.
// We gather some data here, and convert the function call to a method
// invocation on TCPServer.

static void TCPServerAcceptCallBack(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) {

TCPServer *server = (TCPServer *)info;

if (kCFSocketAcceptCallBack == type) {

// for an AcceptCallBack, the data parameter is a pointer to a CFSocketNativeHandle

CFSocketNativeHandle nativeSocketHandle = *(CFSocketNativeHandle *)data;
uint8_t name[SOCK_MAXADDRLEN];
socklen_t namelen = sizeof(name);
NSData *peer = nil;

if (0 == getpeername(nativeSocketHandle, (struct sockaddr *)name, &namelen)) {

peer = [NSData dataWithBytes:name length:namelen];

}

CFReadStreamRef readStream = NULL;
CFWriteStreamRef writeStream = NULL;
CFStreamCreatePairWithSocket(kCFAllocatorDefault, nativeSocketHandle, &readStream, &writeStream);

if (readStream && writeStream) {

CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
[server handleNewConnectionFromAddresseer inputStreamNSInputStream *)readStream outputStreamNSOutputStream *)writeStream];

} else {

// on any failure, need to destroy the CFSocketNativeHandle
// since we are not going to use it any more

close(nativeSocketHandle);

}

if (readStream) CFRelease(readStream);
if (writeStream) CFRelease(writeStream);

}
}

Would be great if somebody could help my figure out how to do that.
Thanks for taking your time!

[freshking]

I tried this:

- (void)handleNewConnectionFromAddress: (NSData *)addr inputStream: (NSInputStream *)istr outputStream: (NSOutputStream *)ostr {

if (self.delegate && [self.delegate respondsToSelector: @selector(didAcceptConnectionForServer:inputStream : outputStream: )]) {
[self.delegate didAcceptConnectionForServer: self inputStream: istr outputStream: ostr];

NSString *output = [[NSString alloc] initWithData: addr encoding: NSUTF8StringEncoding];
NSLog(@"NAME: %@", output);
}
}

but im only getting this as a result:

2009-09-11 11:20:27.877 Texter[2020:20b] NAME: (null)

Why is that?

[smithdale87]

According to the NSString class reference, this method
"Returns nil if the initialization fails for some reason (for example if data does not represent valid data for encoding)."

So you can check if your "addr" is nil. If not, then it more than likely can't be converted to UTF8.