如何以编程方式在root用户拥有的文件夹中创建文件

Question

I'm developing an application in Qt. I need to create a file in the location /usr/share/applications. The following is my code

  QDir::setCurrent("/usr/share/applications");
  QFile launcherFile;
  launcherFile.setFileName("aptana.desktop");
  int status = launcherFile.open(QIODevice::WriteOnly | QIODevice::Text);
  QTextStream stream(&launcherFile);
  stream<<"Create file";
  launcherFile.close();

I'm not getting any error while debugging but neither does the file get created. I think it is a privilege issue because the user I'm logged in as does not have privilege to access this folder. I have seen other applications like Synaptic Manager prompting for the administrative password before continuing towards the application. Similarly is there anyway in which I can pop up the dialog box asking for the password and get the credential to create the file as root user? What other ways are there to tackle this situation?

Answer 1

I've just found an approach to the general problem of asking for root priviledges and doing something. Dio3 calls system() and passes the password to the cmd-level. . I don't know about a way to 'read a file through system and make QT-API happy, but you could change the file-permissions that way... but everyone doin' this to serious files should have security nightmares :)