遇到问题的编程流(Having trouble programming streams)

因此，这里的问题：数据流是不是在正确的时间写作，是无法从我的服务器的响应。 我知道我在写正确的数据，因为当我停下来构建，将其写入服务器和服务器是幸福的。 我很困惑，为为什么这不是在正确的时间发生。

我使用GCDAsyncSocket读/写插座

我做了一个单独的类来处理所有的网络，这里是我的代码：

-(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;
     }

}

这里的控制台说什么：

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:

您正在阅读本：

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

这需要一个CRLF作为流的分离。 但我不明白，你把它添加到您的JSONRequestData。 因此，修改您的JSONRequestData是可变的，就像这样：

NSMutableData *JSONRequestData;

然后这一行之前：

 

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

补充一点：

[JSONRequestData appendData:[GCDAsyncSocket CRLFData]];

Answer 2:

当发送数据的短块总是冲你想有一个立竿见影的效果每次写操作之后的缓冲区。
我不知道你在干什么，在你的代码。
如果你不这样做，那么缓冲器会被刷新，只有当它是满或流被关闭。

文章来源: Having trouble programming streams