Question

我有一个TCP连接类，它使用NSStreamDelegate并且工作正常。它接收消息并在任何事情中对它们做出响应。在某些情况下，它应该打开第二个连接。这是第二类，与第一类非常相似。

在打开时，第一个类应该等到流报告打开状态：

- (BOOL)connectDataConnection {
    __block BOOL connected = YES;
    _dataConnection = [JWTCPConnection connectionWithInputStream:(__bridge NSInputStream *)readStream and outputStream:(__bridge NSOutputStream *)writeStream];
    [_dataConnection openWithTimeoutBlock:^{
        connected = NO;
    }];

    return connected;
}


// JWTCPConnection

- (id)initWithInputStream:(NSInputStream *)inStream andOutputStream:(NSOutputStream *)outStream {
    if (self = [super init]) {
        _iStream = inStream;
        _oStream = outStream;

        [_iStream setDelegate:self];
        [_oStream setDelegate:self];

        [_iStream scheduleInRunLoop:[NSRunLoop currentRunLoop] foreMode:NSRunLoopCommonModes];
        [_oStream scheduleInRunLoop:[NSRunLoop currentRunLoop] foreMode:NSRunLoopCommonModes];
    }

    return self;
}

- (void)openWithTimeoutBlock:(void (^)())timeoutBlock {
    _timeoutBlock = timeoutBlock;

    float seconds = 5.0;
    dispatch_time_t dispatchTime = dispatch_time(DISPATCH_TIME_NOW, seconds * NSEC_PER_SEC);
    dispatch_queue_t dispatchQueue = dispatch_queue_create("com.company.app", 0);

    dispatch_async(dispatchQueue, ^{
        dispatch_after(, dispatchTime, dispatchQueue, ^{
            if (_timeoutBlock) {
                _timeoutBlock();
                [self close];
            }

            dispatch_semaphore_signal(_connectionSemaphore);
        });
    });

    _connectionSemaphore = dispatch_semaphore_create(0);

    [_iStream open];
    [_oStream open];

    dispatch_semaphore_wait(_connectionSemaphore, DISPATCH_TIME_FOREVER);
}

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode {
    NSLog(@"a stream handels event...");
}

我的问题是，没有调用流委托方法-stream:handleEvent:。

我在我的第一堂课中使用了几乎完全相同的代码。即使我删除dispatch_semaphore_wait();调用，代理方法也不会触发。

在我不等的情况下，我可以写入流。但我必须在异步环境（第一类）中实现超时。

我在第一个类的-openWithTimeoutBlock:方法中调用-stream:handleEvent:方法。可能会中断第二个班级NSStreamDelegate吗？

任何想法如何解决？

NSStreamDelegate未接收消息

0 个答案: