Question

所以这是问题所在：流不是在正确的时间写入，并且无法从我的服务器获得响应。我知道我正在编写正确的数据，因为当我停止构建时，它会写入服务器并且服务器很高兴。我很困惑为什么在合适的时间没有发生这种情况。

我正在使用GCDAsyncSocket读取/写入套接字

我已经创建了一个单独的类来处理所有网络，这是我的代码：

-(id)init{
    self = [super init];
    if (self) {
        asyncSocket = [[GCDAsyncSocket alloc] initWithDelegate:self         delegateQueue:dispatch_get_main_queue()];

        NSError *error = nil;
        if (![asyncSocket connectToHost:@"localhost" onPort:8888 error:&error]) //     Asynchronous!
        {
            // If there was an error, it's likely something like "already connected" or     "no delegate set"
            NSLog(@"I goofed: %@", error);
        }
    }
    return self;
}
//GCD Async Delegate Methods
- (void)socket:(GCDAsyncSocket *)sender didConnectToHost:(NSString *)host port:(UInt16)port
{
    NSLog(@"socket:%p didConnectToHost:%@ port:%hu", sender, host, port);
    NSLog(@"Cool, I'm connected! That was easy.");
}
 - (void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag
{
    if (tag == 1)
        NSLog(@"First request sent");
    else if (tag == 2)
        NSLog(@"Second request sent");
    //read data of custom length
    /*
     if (tag == TAG_FIXED_LENGTH_HEADER)
     {
     int bodyLength = [self parseHeader:data];
     [socket readDataToLength:bodyLength withTimeout:-1 tag:TAG_RESPONSE_BODY];
     }
     else if (tag == TAG_RESPONSE_BODY)
     {
     // Process the response
     [self handleResponseBody:data];

     // Start reading the next response
     [socket readDataToLength:headerLength withTimeout:-1 tag:TAG_FIXED_LENGTH_HEADER];
     }
     */
}

-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
    NSError *error;
    serverJSONResponseParsed = [NSJSONSerialization JSONObjectWithData:data     options:kNilOptions error:&error];
}

-(BOOL)sendString:(NSString *)sendString{

    NSError *error;

    NSLog(@"Sending String: %@",sendString);

    NSDictionary *blobData = [NSDictionary dictionaryWithObjectsAndKeys:
                              sendString,@"string",
                              nil];
    NSString *blobString = [[NSString alloc]
                             initWithData:[NSJSONSerialization dataWithJSONObject:blobData      options:kNilOptions error:&error]
                             encoding:NSUTF8StringEncoding];
    NSLog(@"Blob Created: %@", blobString);
    NSDictionary *requestData = [NSDictionary dictionaryWithObjectsAndKeys:
                                 @"send_string",@"request_type",
                                  [NSNumber numberWithInt:0],@"security_level",
                                  @"ios",@"device_type",
                                  //No Email Provided, This is just for testing
                                 blobString,@"blob",
                                 nil];

    NSData *JSONRequestData = NULL;
    JSONRequestData = [NSJSONSerialization dataWithJSONObject:requestData options:kNilOptions error:&error];
            NSLog(@"Contents of JSONRequestData: %@",[[NSString alloc]     initWithData:JSONRequestData encoding:NSUTF8StringEncoding]);
     //Write the data
    [asyncSocket writeData:JSONRequestData withTimeout:-1 tag:1];

    //read a response
     [asyncSocket readDataToData:[GCDAsyncSocket CRLFData] withTimeout:-1 tag:2];

    NSDictionary *JSONResponseData = serverJSONResponseParsed;
    /*
    if (serverResponse != NULL) {
         JSONResponseData = [NSJSONSerialization JSONObjectWithData:serverResponse      options:kNilOptions error:&error];
    }
     */
    NSString *failure = [JSONResponseData objectForKey:@"failure"];
    if ([failure respondsToSelector:@selector(isEqualToString:)]) {
        NSLog(@"Unknown Object, Not a NSString");
    }
     if ([failure isEqualToString:@"none"]) {
        NSLog(@"Success Sending String");
        return TRUE;
    }
    else {
        NSLog(@"%@",failure);
        return FALSE;
     }

}

以下是控制台所说的内容：

2012-08-16 18:15:27.831 FlokMobile[4257:c07] Sending String: hello
2012-08-16 18:15:27.832 FlokMobile[4257:c07] Blob Created: {"string":"hello"}
2012-08-16 18:15:27.832 FlokMobile[4257:c07] Contents of JSONRequestData:     {"security_level":0,"request_type":"send_string","device_type":"ios","blob":"     {\"string\":\"hello\"}"}
2012-08-16 18:15:27.833 FlokMobile[4257:c07] (null)
2012-08-16 18:15:27.833 FlokMobile[4257:c07] It didn't work - appdel
2012-08-16 18:15:27.850 FlokMobile[4257:c07] socket:0x6992890 didConnectToHost:127.0.0.1 port:8888
2012-08-16 18:15:27.850 FlokMobile[4257:c07] Cool, I'm connected! That was easy.
2012-08-16 18:15:27.851 FlokMobile[4257:c07] First request sent

Answer 1

你正在阅读：

[asyncSocket readDataToData:[GCDAsyncSocket CRLFData] withTimeout:-1 tag:2];

期望CRLF作为流的分隔符。但是我没有看到你将它附加到JSONRequestData的位置。因此，修改您的JSONRequestData是可变的，如下所示：

NSMutableData *JSONRequestData;

然后在这一行之前：

[asyncSocket writeData:JSONRequestData withTimeout:-1 tag:1];

添加：

[JSONRequestData appendData:[GCDAsyncSocket CRLFData]];

Answer 2

在每次写入后发送短数据块始终刷新缓冲区时，您希望立即生效。
我不认为你在你的代码中这样做如果不这样做，则只有当缓冲区已满或流已关闭时才会刷新缓冲区。

编程流时遇到问题

2 个答案: