1

我成功地使用以下代码将 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]; 

当服务器收到此消息时,它会回复一系列响应。我怎样才能捕捉和处理这些?我希望我的应用程序在它发送传出消息的同一端口上监听服务器响应 2 分钟,然后在无限循环中重复初始化消息:

message -> listen -> message -> listen ...
4

1 回答 1

1

我能够自己弄清楚 - 毕竟并不难:-)

要开始在后台收听,我只是使用了这个:

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];

然后我在这个类中处理响应:

- (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);
    }
}
于 2012-11-21T11:21:47.267 回答