这一段代码错在哪里，执行的时候会出问题

QString srcimgfilename; QString rawdatafilename; QStringList filelist; filelist = QFileDialog::getOpenFileNames(this,tr(“选择文件”),”.”,tr(“Text files (.txt);;XML files (.xml)”)); QStringList::const_iterator it = filelist.constBegin(); while(it != filelist.constEnd()) { leftpointfilename = (*it).toLocal8Bit; std::cout<<(*it).toLocal8Bit().constData()<<std::endl; ++it; rightpointfilename = (*it).toLocal8Bit; std::cout<<(*it).toLocal8Bit().constData()<<std::endl; }