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iOS收到来自服务器的udp响应

[英]iOS receive udp response from server

我已成功使用以下代码将UDP消息发送到服务器:

GCDAsyncUdpSocket *udpSocket; 
    udpSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];
NSData *data = [@"initialize" dataUsingEncoding:NSUTF8StringEncoding];
[udpSocket sendData:data toHost:@"127.0.0.1" port:5000 withTimeout:-1 tag:1]; 

服务器收到此消息后,会回复一系列响应。 我该如何捕捉和处理这些? 我希望我的应用在发送外发消息的端口上监听服务器响应2分钟,然后在无穷循环中重复初始化消息:

message -> listen -> message -> listen ...

我自己就能弄清楚-毕竟并不辛苦:-)

要开始在后台收听,我只使用了以下方法:

NSError *error = nil;

    if (![udpSocket bindToPort:0 error:&error])
    {
        NSLog(@"Error binding: %@", [error description]);
        return;
    }
    if (![udpSocket beginReceiving:&error])
    {
        NSLog(@"Error receiving: %@", [error description]);
        return;
    }

为了重复发送初始化,我使用了一个计时器initlilzieServer包含上面的代码):

timer = [NSTimer scheduledTimerWithTimeInterval:150
                                         target:self
                                         selector:@selector(initializeServer)
                                         userInfo:nil
                                         repeats:YES];

然后,我在此类中处理响应:

- (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext
{
NSString *msg = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
    if (msg)
    {
        NSLog(@"%@",msg);

    }
    else
    {
        NSString *host = nil;
        uint16_t port = 0;
        [GCDAsyncUdpSocket getHost:&host port:&port fromAddress:address];

        NSLog(@"Unknown Message: %@:%hu", host, port);
    }
}

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