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因为TCP是流式处理的，所以包没有边界，必须设计一个包头，里面表示包的长度（一般用字节表示），根据这个来逐个拆包。如果对于发送/接收频率不高的话，一般也就不做拆包处理了，因为不大可能有粘包现象。
以下是粘包和拆包的分析：
http://blog.csdn.net/zhangxinrun/article/details/6721495
用Qt的TCPSocket读出的数据来拆：
http://www.aiuxian.com/article/p-1732805.html
我是根据以上链接例子Qt的逻辑来实现的，用Boost的ASIO来读取，是同步的：
1 m_imp->m_thread = boost::make_shared<boost::thread>( 2 [=]() 3 { 4 while (!boost::this_thread::interruption_requested()) 5 { 6 boost::this_thread::interruption_point(); 7 8 try 9 { 10 boost::system::error_code ec; 11 std::vector<uint8_t> tmpreadBuffer(1024 * 500); 12 13 size_t bytes_transferred = m_imp->m_sockPtr->read_some(boost::asio::buffer(tmpreadBuffer), ec); 14 15 std::cout << "Byte Transfered:" << bytes_transferred << "\n"; 16 17 if (!ec) 18 { 19 20 if (bytes_transferred == 0) continue; 21 22 if (bytes_transferred < MSG_HEAD_SIZE) 23 { 24 m_imp->m_readBuffer.insert(m_imp->m_readBuffer.end(), tmpreadBuffer.begin(), tmpreadBuffer.begin() + bytes_transferred / sizeof(uint8_t)); 25 continue; 26 } 27 else 28 { 29 m_imp->m_readBuffer.insert(m_imp->m_readBuffer.end(), tmpreadBuffer.begin(), tmpreadBuffer.begin() + bytes_transferred / sizeof(uint8_t)); 30 31 size_t totalSize = m_imp->m_readBuffer.size()*sizeof(uint8_t); 32 33 while (totalSize) 34 { 35 size_t msgSize = m_imp->getMsgLen(); 36 std::cout << "Msg Size is:" << msgSize << "\n"; 37 38 std::vector<uint8_t>::const_iterator first = m_imp->m_readBuffer.begin(); 39 std::vector<uint8_t>::const_iterator last = m_imp->m_readBuffer.begin() + msgSize / sizeof(uint8_t); 40 std::vector<uint8_t> tmpMsg(first, last); 41 42 m_imp->m_msgQueue.push_back(tmpMsg); 43 44 m_imp->m_readBuffer.erase(first, last); 45 46 totalSize = m_imp->m_readBuffer.size()*sizeof(uint8_t); 47 48 49 } 50 51 } 52 53 54 55 56 57 58 } 59 else 60 { 61 std::cerr << "recv error : RAC module！" << ec.message() << std::endl; 62 m_imp->m_sockPtr->close(); 63 break; 64 } 65 } 66 catch (std::exception& e) 67 { 68 std::cerr << e.what() << std::endl; 69 m_imp->m_sockPtr->close(); 70 break; 71 } 72 } 73 } 74 75 76 77 );
以下一个附带干货，以前一直不太理解Qt的TCPSocket，下面是底层原理：
http://blog.csdn.net/ying_593254979/article/details/17006507
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原文地址：http://www.cnblogs.com/foohack/p/4739704.html
