使用NSInputStream从iOS客户端中的Java服务器收到第一条消息后，没有收到更多消息

Question

我有一个Java服务器（它能够正确读取我的iOS客户端的请求-它甚至会生成一个响应并似乎正确发送了该请求，尽管我每次都从服务器获得“第一条消息”响应，但之后却没有收到其他消息接收第一条消息）：

沟通的顺序

Step 1-> client send login message to server

Step 2-> server validate the user and sends login info to the clients

Step 3-> Message Packet1

         Message Packet2

         Message Packet3

         Message Packet4

 step-4-> I have checked server log and it says server has send 4 string 
          messages

 Step-5 -> On client side I am receiving only first message i.e. Message 
           Packet1, and there no other packets on NSInputStream showing. or NSStreamEventHasBytesAvailable option in delegate method->
- (void)stream:(NSStream *)theStream
handleEvent:(NSStreamEvent)streamEvent

大部分时间不调用一次以上，但有时它调用并获取MessagePacket2或MessagePacket4数据。

请帮帮我，我无法弄清楚为什么我只从服务器收到第一个数据包而不是4个数据包，因为服务器发送4个数据包。

我使用了以下教程中的代码-> http://www.raywenderlich.com/3932/networking-tutorial-for-ios-how-to-create-a-socket-based-iphone-app-and-server#评论

我的代码在这里->

@interface NetworkManager()<NSStreamDelegate>

@property (strong, nonatomic)NSInputStream        *objInputStream;
@property (strong, nonatomic)NSOutputStream       *objOutputStream;

@end

- (void)initializeNetworkCommunicationToServer
{
self.networkOpened = NO;

CFReadStreamRef readStream;
CFWriteStreamRef writeStream;

CFStreamCreatePairWithSocketToHost(NULL,
                                   (CFStringRef)SERVER_HOSTNAME,
                                   SERVER_PORT_ADDR,
                                   &readStream,
                                   &writeStream);

self.objInputStream = (__bridge_transfer NSInputStream *)readStream;
self.objOutputStream = (__bridge_transfer NSOutputStream*)writeStream;


[self.objInputStream setDelegate:self];
[self.objOutputStream setDelegate:self];

[self.objInputStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
                               forMode:NSDefaultRunLoopMode];
[self.objOutputStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
                                forMode:NSDefaultRunLoopMode];
[self.objInputStream open];
[self.objOutputStream open];

}

//------------------------------------------------------
pragma NSStreamDelegate delegate method
//------------------------------------------------------

- (void)stream:(NSStream *)theStream
handleEvent:(NSStreamEvent)streamEvent
{

switch (streamEvent)
{
    case NSStreamEventNone:
    {
        NSLog(@"NSStreamEventNone");
        break;
    }
    case NSStreamEventOpenCompleted:
    {
        NSLog(@"NSStreamEventOpenCompleted");

    }
        break;
    case NSStreamEventHasBytesAvailable:
    {
        NSLog(@"NSStreamEventHasBytesAvailable:");

        if (theStream == self.objInputStream)
        {
            while ([self.objInputStream hasBytesAvailable])
            {
                uint8_t buffer[1024];
                unsigned int len = 0;

                len = [self.objInputStream read:buffer
                                      maxLength:sizeof(buffer)];
                if (len > 0)
                {

                    NSString *output =
                    [[NSString alloc] initWithBytes:buffer
                                             length:len
                                           encoding:NSASCIIStringEncoding];

                    if (nil != output)
                    {
                        NSLog(@"server said: %@", output);
                    }

                }//end of if(len > 0)

            }//end of while
        } //end of  if (theStream == self.objInputStream)

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

        NSLog(@"NSStreamEventEndEncountered & network connection ended");

        [theStream close];
        [theStream removeFromRunLoop:[NSRunLoop currentRunLoop]
                             forMode:NSDefaultRunLoopMode];

        theStream = nil;
    }
        break;

        // The NSStreamEventHasSpaceAvailable event indicates that you can write (at least one byte!) to the stream without blocking. That does not mean that previously written data is completely delivered to the other endpoint of the connection.
    case NSStreamEventHasSpaceAvailable:
    {
        NSLog(@"NSStreamEventHasSpaceAvailable");

        if(NO == self.networkOpened)
        {
            self.networkOpened = YES;

            [self sendMessage:@"login:username,password"];

        }
    }
        break;
    default:
    {
        NSLog(@"Unknown event");
    }
}
}


//------------------------------------------------------
#pragma mark - send packet
//------------------------------------------------------

- (void)sendMessage:(NSString*)lstrMessage
{
NSMutableData *data = [[NSMutableData alloc] initWithData:
                       [lstrMessage dataUsingEncoding:NSASCIIStringEncoding]];

unsigned char suffixBytes[] = {1, 1, 0};
[data appendBytes:suffixBytes length:3];

[self.objOutputStream write:[data bytes] maxLength:[data length]];

NSLog(@"message sent->%@",[NSString stringWithUTF8String:[data bytes]]);

}

Answer 1

我不知道您的代码有什么问题，但是我在流调整方面的经验告诉我，将有可能尝试使用CF API订阅Core Foundation流的另一种方法，而不是将其免费桥接到NSInputStream。 我的意思是CFReadStreamSetClient和CFReadStreamScheduleWithRunLoop函数。 您可以在我的用于测试POSInputStreamLibrary 帮助器类中查看如何执行此操作的POSInputStreamLibrary 。