bool IsDoExist(const QString & sName)
{
	QString sBasePath = “C:\\test”；
	QDir dir(sBasePath);
	QFileInfoList infoList = dir.entryInfoList(QStringList()<<"*.xml",QDir::Files,QDir::Time);
	foreach(const QFileInfoList &info, infoLitst)
	{
		if（info.baseName() == sName）
			return ture;
	}
	return false;
}
void main()
{
	QString sName = "test";
	int iSeq = 1;
	QString sBaseName = sName;
	while(IsDoExist(sName))
	{
		sName = QString("%1_%2").arg(sBaseName).arg(iSeq++);
	}
}