CFNetwork packet read callback not being called (iPhone)
Running on the iPhone simulator, I am listening on a port for packets, but my callback never gets called (and the packets are being sent for sure, checked with wireshark). Simplified code follows:
#define IN_PORT (51112)
static void ReadCallback (CFSocketRef theSocket, CFSocketCallBackType theType, CFDataRef theAddress, const void *data, void *info)
{
NSLog(@"Data received");
}
@implementation MyListener
- (void) ListenOnPort:(uint16_t)port withCallback:(CFSocketCallBack)callback
{
CFSocketContext context = {0,self,NULL,NULL,NULL};
CFSocketRef开发者_如何学JAVA cfSocket = CFSocketCreate(NULL, PF_INET, SOCK_DGRAM, PPROTO_UDP, kCFSocketReadCallBack, callback, &context);
if (cfSocket==NULL)
NSLog(@"CFSocketCreate failed");
struct sockaddr_in addr;
memset(&addr,0,sizeof(addr));
addr.sin_len = sizeof(addr);
addr.sin_family = AF_INET;
addr.sin_port = port;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
NSData *address = [NSData dataWithBytes:&addr length:sizeof(addr)];
if(kCFSocketSuccess != CFSocketSetAddress(cfSocket, (CFDataRef)address))
NSLog(@"CFSocketSetAddress failed");
CFRunLoopSourceRef rls = CFSocketCreateRunLoopSource(kCFAllocatorDefault, cfSocket, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopCommonModes);
CFRelease(rls);
}
@end
Somewhere else in the code, MyListener is instantiated and its method ListenOnPort is called, like so:
myListener = [[MyListener alloc] init];
[myListener ListenOnPort:IN_PORT withCallback:&ReadCallback];
No failures occur, but Data is never received. Source of packets is another computer on the same lan, and like I mentioned, they are seen by wireshark (udp with correct ip and port number).
This is the first time I try to use this framework. Any help is appreciated.
Try changing:
addr.sin_port = port;
To:
addr.sin_port = htons(port);
(The simulator runs on Intel so you need to convert to network order)
Try to replace CFRunLoopGetCurrent() with CFRunLoopGetMain()
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