CFStream實現socket

1，利用CFStream建立socket連接：

• 建立連接的基本設置并設置代理，通過代理進行監聽：

    //1，通過Stream創建Socket對連接到主機，第一個值CFAllocatorRef alloc傳NULL，可以默認分配內存
    //五個參數分別是：分配空間，主機，端口號，輸入流，輸出流
    NSString *host = @"127.0.0.1";//我這里直接連接本機
    unsigned int port = 5222;//Openfire的默認端口，我已經安裝過Openfire服務器，所以我這里可以連接到這個端口
    CFReadStreamRef readStream;
    CFWriteStreamRef writeStream;
    CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)(host), port, &readStream, &writeStream);
    
    //2,把c語言的輸入輸出流轉換成OC的輸入輸出流，方便后期用代理進行監聽
    _inputStream = (__bridge NSInputStream *)(readStream);
    _outputStream = (__bridge NSOutputStream *)(writeStream);
    
    
    //3,設置代理就可以進行監聽了
    _inputStream.delegate = self;
    _outputStream.delegate = self;
    
    //4，把輸入輸出流放到主運行循環中,并打開輸入輸出流
    [_inputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [_outputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [_inputStream open];
    [_outputStream open];

2,遵守協議后實現監聽方法即可監聽狀態的改變如下：

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode{
    /*
    NSStreamEventNone = 0,
    NSStreamEventOpenCompleted = 1UL << 0,//輸入輸出流打開成功
    NSStreamEventHasBytesAvailable = 1UL << 1,//有信息
    NSStreamEventHasSpaceAvailable = 1UL << 2,//可以發送信息
    NSStreamEventErrorOccurred = 1UL << 3,//連接出錯
    NSStreamEventEndEncountered = 1UL << 4//連接結束
     */
    switch (eventCode) {
        case NSStreamEventOpenCompleted:
            NSLog(@"輸入輸出流打開成功");
            break;
        case NSStreamEventHasBytesAvailable:{
            NSLog(@"有信息");
            
            uint8_t buf[1024];//建立一個1024字節的緩沖區
            //返回信息的實際字節長度
            NSInteger length = [_inputStream read:buf maxLength:sizeof(buf)];
            
            //把字節轉換成字符串
            NSData *data = [NSData dataWithBytes:buf length:length];
            NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
            NSLog(@"接收到消息----%@------%@",aStream, str);
            
            
            break;
        }
        case NSStreamEventHasSpaceAvailable:
            NSLog(@"可以發送信息");
            break;
        case NSStreamEventErrorOccurred:
            NSLog(@"連接出錯");
            break;
        case NSStreamEventEndEncountered:
            NSLog(@"連接結束");
            break;
        default:
            break;
    }
}

3,數據操作，由于我這里沒有服務器，所以只是簡單的演示一下：

    //1,發送用戶名過去,這里需要按照xmpp通訊協議的格式寫上正確的xml格式發送才可以，我這里寫的好像不對，所以沒有返回數據
    NSString *userName = @"admin";
    NSData *data = [userName dataUsingEncoding:NSUTF8StringEncoding];
    [_outputStream write:data.bytes maxLength:data.length];
    

GCDAsyncSocket實現socket

1，建立連接，設置代理等

//1,建立socket
    _asynSocket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];
    
    NSString *host = @"127.0.0.1";
    uint16_t port = 5222;
    NSError  *error;
    [_asynSocket connectToHost:host onPort:port error:&error];
    
    if (error) {
        NSLog(@"%@",error);
    }else{
        NSLog(@"連接正確");
    }

2，遵守協議，實現代理方法等

- (void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{
    NSLog(@"連接主機成功");
}

- (void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag{
    NSLog(@"數據發送成功---%ld",tag);
    
    //需要在發送成功后手動調用readData方法才能在接受的代理方法中正確接受到數據
    [_asynSocket readDataWithTimeout:-1 tag:tag];
}

- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
    NSLog(@"接受到數據---%@",data);
}


- (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{
    NSLog(@"與主機斷開連接---%@",err);

}

3，讀寫數據等

    //讀寫數據
    NSData *data = [@"zhangdanfeng" dataUsingEncoding:NSUTF8StringEncoding];
    [_asynSocket writeData:data withTimeout:-1 tag:100];