这段程序什么意思

bool huateng::CFileProcess::ParseTransHead()
{
    int    seekNo = 0;
    try
    {
        //获取结算日期
        m_SettleDate = m_FileLine.substr(seekNo,8);
        seekNo += 8;
        //获取营运单位代码
        m_CorpId = m_FileLine.substr(seekNo,8);
        seekNo += 8;
        //获取记录总数
        m_RecNum = CCommon::string2long(m_FileLine.substr(seekNo,10));
        seekNo += 10;
    }
    catch (exception& e)
    {
#ifdef _DEBUG
        cerr << "Caught: " << e.what() << endl;
        cerr << "Type: " << typeid(e).name( ) << endl;
#endif
        string errStr = "ParseTransHead Err,ErrMsg:";
        errStr += e.what();
        WriteLogXml(errStr,"FileProcess",0,1);
        m_ErrCode=SYSTEM_ERR;
        return false;
    }
    return true;
}