用单独的线程接收socket数据，当socket与主机断开时，自动重连。 
只贴关键代码

//线程的run函数
void Thread::run()
{
    while (!m_boolThreaStopped)
    {
        if (!m_TcpSocket)
        {
            m_TcpSocket = new QTcpSocket(this);
            connect(m_TcpSocket, SIGNAL(readyRead()), this, SLOT(ReadMsg1()));
            connect(m_TcpSocket, SIGNAL(connected()), this, SLOT(Onconnect()));
            connect(m_TcpSocket, SIGNAL(disconnected()), this, SLOT(OnDisConnect()));

        }
        if (!m_isOkConect)
        {
            m_TcpSocket->connectToHost(m_QStrSocketIp, m_nSockPort);
            //等待连接。。。延时三秒，三秒内连不上返回false
            m_isOkConect = m_TcpSocket->waitForConnected(3000);
        }
        if (!m_isOkConect)
        {
            continue;
        }
        if (!m_isOkSetHeader)
        {
            setHeader(m_TcpSocket, m_QStrToken);
            m_isOkSetHeader = m_TcpSocket->waitForBytesWritten(5000);
        }
        if (!m_isOkSetHeader)
        {
            continue;
        }
        m_TcpSocket->waitForReadyRead(3000);
    }
    m_boolThreaStopped = false;
}

void Thread::OnDisConnect()
{
    //socket已断开会进入这个槽函数
    //通过把m_isOkConect 设为false，在run线程循环中将重新连接主机
    m_isOkConect = false;
    //清空半包缓存
    m_strToDeBeHandle.clear();
}