Qt遍歷目錄查找指定的文件

bool QueryFilePath(QDir & dir, QFileInfo & fileInfo)
{
	bool isFileExistDst = false;
	std::string strFileNameDst;
	dir.setFilter(QDir::Files | QDir::NoSymLinks);
	dir.setSorting(QDir::Size | QDir::Reversed);
	QFileInfoList list = dir.entryInfoList();
	for (int i = 0; i < list.size(); ++i)
	{
		fileInfo = list.at(i);
		strFileNameDst = fileInfo.fileName().toLocal8Bit().toStdString();
		//qDebug() << fileInfo.absoluteFilePath();
		if (boost::icontains(strFileNameDst, ".txt"))
		{
			qDebug() << "find txt:" << fileInfo.fileName();
			return true;

		}
	}
	if (!isFileExistDst)
	{
		qDebug() << "txt does not exist.";
		return false;
	}
	return false;
}