qt work

   auto folder1="./.mm";
    QDir *folder = new QDir;
      bool exist = folder->exists(folder1);
      if(exist)
      {
          QMessageBox::warning(this, tr("createDir"), tr("Dir is already existed!"));
      }
      else
      {
          //创建文件夹
          bool ok = folder->mkdir(folder1);
          if(ok)
              QMessageBox::warning(this, tr("CreateDir"), tr("Create Dir success!"));
          else
              QMessageBox::warning(this, tr("CreateDir"), tr("Create Dir fail"));
      }