未调用NSStream委派NSStreamEventHasBytesAvailable

Question

我正在编写一个消息传递应用程序，它使用NSStream与用Python语言编写的服务器通信。该服务器与配套的Python客户端完美配合工作。但是当我使用NSStream连接到它时，NSInputStream似乎没有获得任何数据。然而，NSOutputStream运行得非常完美。我像这样打开字符串：

-(void)openStream
{
    CFReadStreamRef readStream;
    CFWriteStreamRef writeStream;
    CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"tihmstar.dyndns.org", 80,       &readStream, &writeStream);

    inputStream = (__bridge_transfer NSInputStream *)readStream;
    outputStream = (__bridge_transfer NSOutputStream *)writeStream;
    [inputStream setDelegate:self];
    [outputStream setDelegate:self];
    [inputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [outputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [inputStream open];
    [outputStream open];

    [self auth];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"InitCompleted" object:nil];
}

委托方法是这样的：

- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent
    {
        NSLog(@"Handle Event - ");
        switch (streamEvent)
        {
            case NSStreamEventOpenCompleted:
                NSLog(@"Stream opened");
                break;

            case NSStreamEventHasBytesAvailable:
                NSLog(@"Bytes Available!");
                if(theStream == inputStream)
                {
                    NSLog(@"inputStream is ready.");

                    uint8_t buf[1024];
                    unsigned int len = 0;

                    len = [inputStream read:buf maxLength:1024];

                    if(len > 0)
                    {
                        NSMutableData* data=[[NSMutableData alloc] initWithLength:0];

                        [data appendBytes: (const void *)buf length:len];

                        NSString* string = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
                        NSLog(@"Server said- %@", string);
                        [self messageReceived:[string lowercaseString]];
                    }
                }
                break;

            case NSStreamEventErrorOccurred:
                NSLog(@"Can not connect to the host!");
                break;

            case NSStreamEventEndEncountered:
                NSLog(@"End Encountered");
                break;

            case NSStreamEventHasSpaceAvailable:
                NSLog(@"Space Availible.");
                break;

            default:
                NSLog(@"Unknown event- %u", streamEvent);
        }
    }

我的问题是case NSStreamEventHasBytesAvailable永远不会被调用，因此永远不会收到来自服务器的消息。有人对此有什么解决方案吗？我在StackOverflow上发现了一些相关的问题，但都没有得到回答。

提前谢谢。

Answer 1

我只是在看代码。尝试删除NSInputStream的委派。我在调查另一个Using NSXMLParser initWithStream: no parser delegate methods received

来处理类似的情况。

Answer 2

我不知道你的问题的确切答案，但我很清楚你不应该打电话给

[self auth];

NSStream之后马上开张。你必须等待

NSStreamEventHasSpaceAvailable

事件，并仅在之后在其中写入数据。