Socket in iOS

• TCP based Socket (also can use AsynSocket lib)

      NSInputStream *inputStream;
      NSOutputStream *outputStream;

   

- (void)connect

{

    CFReadStreamRef readStream;

    CFWriteStreamRef writeStream;

    

    CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)(@"127.0.0.1"), 80, &readStream, &writeStream);

    inputStream = (__bridge NSInputStream *)readStream;

    outputStream = (__bridge 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)sendMessage:(NSString *)message

{

NSData *data = [[NSData alloc] initWithData:[message dataUsingEncoding:NSASCIIStringEncoding]];

[outputStream write:[data bytes] maxLength:[data length]];

}

• UDP based socket (use AsyncUdpSocket lib)
  • Copy AsyncUdpSocket.h and AsyncUdpSocket.m to your project.
  • Conform to AsyncUdpSocketDelegate for example, 
    • @interface XXXViewController : UIViewController <AsyncUdpSocketDelegate>

  • - (void)initUdpSocket

    {

        asyncUdpSocket = [[AsyncUdpSocket alloc]initWithDelegate:self];

    }

    
    

    - (void)sendMessage:(NSString *)message

    {

        NSData *data = [[NSData alloc] initWithData:[message dataUsingEncoding:NSUTF8StringEncoding]];

        BOOL success = [asyncUdpSocket sendData:data toHost:@"127.0.0.1" port:8888 withTimeout:-1 tag:1];

        NSLog(@"send upd complete: %d", success);

    }