使用NSInputStream從iOS客戶端中的Java服務器收到第一條消息后，沒有收到更多消息

Question

我有一個Java服務器（它能夠正確讀取我的iOS客戶端的請求-它甚至會生成一個響應並似乎正確發送了該請求，盡管我每次都從服務器獲得“第一條消息”響應，但之后卻沒有收到其他消息接收第一條消息）：

溝通的順序

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

大部分時間不調用一次以上，但有時它調用並獲取MessagePacket2或MessagePacket4數據。

請幫幫我，我無法弄清楚為什么我只從服務器收到第一個數據包而不是4個數據包，因為服務器發送4個數據包。

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

我的代碼在這里->

@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

我不知道您的代碼有什么問題，但是我在流調整方面的經驗告訴我，將有可能嘗試使用CF API訂閱Core Foundation流的另一種方法，而不是將其免費橋接到NSInputStream。 我的意思是CFReadStreamSetClient和CFReadStreamScheduleWithRunLoop函數。 您可以在我的用於測試POSInputStreamLibrary 幫助器類中查看如何執行此操作的POSInputStreamLibrary 。