macOS CFSocket Callback not working....Please Help Me

likenoother said:

I am trying to receive broadcast on UDP. I have tried everything possible but i dont receive any callback. but i see the socket open on lsof. it shows my socket with the port number 15598. but for some reason dealWithData does not get called. am i missing something here i am very new to CFsockets. Please help

<Code>
static void dealWithData(CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *data, void *info)
{
printf("received %d bytes from socket %d\n", CFDataGetLength((CFDataRef)data), CFSocketGetNative(s));
}

static void receiveData(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info)
{
// CFSocketSendData(socket, address, (CFDataRef)data, 0.0);
printf("Hello World");
}


static void SetSocketBlockingEnabled(int sock, bool blocking)
{
int flags = fcntl(sock, F_GETFL, 0);
flags = blocking ? (flags&~O_NONBLOCK) : (flags|O_NONBLOCK);
fcntl(sock, F_SETFL, flags);
}

-(void) searchHosts
{
CFSocketRef searchsocket = CFSocketCreate(kCFAllocatorDefault, AF_INET, SOCK_DGRAM, IPPROTO_UDP, kCFSocketDataCallBack, (CFSocketCallBack)&dealWithData, NULL);
int fd = -1;
if ( searchsocket == NULL) {
NSLog(@"CfSocketCreate Failed");
}else{
if( searchsocket ) {
fd = CFSocketGetNative(searchsocket);
if (fd == -1) {

NSLog(@"CfSocketGetnative Failed");}
else{
int yes = 1;
setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (void *)&yes, sizeof(yes));
//SetSocketBlockingEnabled(fd, true);
}
}
}

struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_len = sizeof(addr);
addr.sin_family = AF_INET;
addr.sin_port = htons(15598); //port
//inet_aton("255.255.255.255", &addr.sin_addr);
//addr.sin_addr.s_addr = htonl(INADDR_ANY);

//bind(fd, (struct sockaddr *)&addr, sizeof(addr));

//struct sockaddr_in a = {0, AF_INET, 1234, 0};
CFDataRef searchAddress = CFDataCreate(NULL, (UInt8 *)&addr, sizeof(struct sockaddr_in));

CFSocketSetAddress(searchsocket, searchAddress);

//CFSocketSetAddress(searchsocket, searchAddress);

CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(NULL, searchsocket, 0);

if(source == NULL)
{
NSLog(@"Sorry could not created loop");
}

CFRunLoopAddSource(CFRunLoopGetMain(), source, kCFRunLoopDefaultMode);

//CFRelease(source);
//CFRelease(searchsocket);
CFRunLoopRun();
}
</Code>

Please help i am really stuck here.

Click to expand...