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"));

      }