GCDAsyncSocket 部分读取长文本：iOS

Question

当使用GCDAsyncSocket发送长文本字符串时，在接收端多次调用readDataWithTimeOut，但接收到的数据不一致，即接收到相同的文本但NSData不同。差异的可能原因是什么？请告诉我，因为我对GCDAsyncSocket知之甚少。

- (void)writeData:(NSData *)data {   
    [self.asyncSocket writeData:data withTimeout:-1 tag:1];
}

#pragma mark - GCDAsyncSocket Delegate Methods -
- (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err {
    [[NSNotificationCenter defaultCenter] postNotificationName:KSOCKET_MANAGER_REMOVAL
                                                        object:self
                                                      userInfo:nil];

}

- (void)socketDidCloseReadStream:(GCDAsyncSocket *)sock {

}

- (void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag {

}

- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
    DDLogInfo(@"SOCKET DID READ DATA:%@:%@",self.asyncSocket,self.contactJID);
    [sock readDataWithTimeout:-1 tag:0];
    if (data!=nil)
      [self loadMessageWithData:data];
}

#pragma mark - Private Methods -
- (void)loadMessageWithData:(NSData *)encryptedData {
NSLog(@"DATA RECEIVED");
}

Answer 1

使用这个

socket.readDataToData(getNsData(), withTimeout: -1, tag: 1)

而不是

socket.readDataWithTimeout(1, tag: 0)

使用的功能-

private func getNsData()-> NSData{
        return NSData(bytes: "#####", length: 5)
    }

并要求服务器人员在响应末尾附加此“#####”

//本地socket连接到远程socket

func socket(socket : GCDAsyncSocket, didConnectToHost host:String, port p:UInt16)

{

    println("Connected to \(host) on port \(p).")

    socket.readDataToData(getNsData(), withTimeout: -1, tag: 2)

}

//Some message from remote socket

func socket(socket : GCDAsyncSocket, didReadData data:NSData, withTag tag:UInt16)

{

    var response = NSString(data: data, encoding: NSUTF8StringEncoding) as! String

    let stringLength = count(response) // Since swift1.2 `countElements` became `count`

    let substringIndex = stringLength - count("#####")

    var servResWithoutHash = response.substringToIndex(advance(response.startIndex, substringIndex))

    println("Updated response  \(servResWithoutHash)")



    if let action = getTheCommand(servResWithoutHash){

        println("COMMAND ==  \(action)")

    socket.readDataToData(getNsData(), withTimeout: -1, tag: 2)

}

//Notifies when socket gets disconnected

func socketDidDisconnect(sock: GCDAsyncSocket!, withError err: NSError!) {

    println("Socket did disconnect with error \(err?.description)");
}