As a part of assignment I have to scan my LAN and get the names of devices connected to wifi. I went through apples documentation this and many other S.O links like this. However resolution is not happening, some error occurs. I am not a networking guy and hence most of it sounded greek to me. an almost same question has been asked here This is my code. I have written down the error that is occurring in comments.
An alternate answer would be helpful too.
+ (NSArray *)hostnamesForAddress:(NSString *)address {
// Get the host reference for the given address.
CFStreamError streamError;
struct addrinfo hints;
struct addrinfo *result = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_NUMERICHOST;
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
int errorStatus = getaddrinfo([address cStringUsingEncoding:NSASCIIStringEncoding], NULL, &hints, &result);
if (errorStatus != 0) return nil;
CFDataRef addressRef = CFDataCreate(NULL, (UInt8 *)result->ai_addr, result->ai_addrlen);
if (addressRef == nil) return nil;
freeaddrinfo(result);
CFHostRef hostRef = CFHostCreateWithAddress(kCFAllocatorDefault, addressRef);
if (hostRef == nil) return nil;
CFRelease(addressRef);
BOOL isSuccess = CFHostStartInfoResolution(hostRef, kCFHostNames, &streamError);
// always false
if (!isSuccess){
NSLog(@"error:%@",[self convertCFStreamErrorIntoNSError:streamError]);
// error:Error Domain=kCFErrorDomainCFNetwork Code=2 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)" UserInfo=0x1cd29190 {kCFGetAddrInfoFailureKey=8}
return nil;
}
// Get the hostnames for the host reference.
CFArrayRef hostnamesRef = CFHostGetNames(hostRef, NULL);
NSMutableArray *hostnames = [NSMutableArray array];
for (int currentIndex = 0; currentIndex < [(__bridge NSArray *)hostnamesRef count]; currentIndex++) {
[hostnames addObject:[(__bridge NSArray *)hostnamesRef objectAtIndex:currentIndex]];
}
return hostnames[0];
}
