How to set permissions to a file using QFile::setPermissions()

[g16bit]

Hi, everybody. I have a problem when working with file permissions. When I create a file, its default permissions are -rw-r--r-- and now i want to add execute permission to this file. This mean its permissions must be -rwxr-xr-x. So I used these commands:

QString savefile = QFileDialog::getSaveFileName(this,"Save File", QDir::currentPath(),fillter0) + ".desktop";
QFile myfile(savefile);
myfile.setPermissions(QFile::ExeGroup);
myfile.setPermissions(QFile::ExeOther);
myfile.setPermissions(QFile::ExeOwner);
myfile.setPermissions(QFile::ExeUser);

QString savefile = QFileDialog::getSaveFileName(this,"Save File", QDir::currentPath(),fillter0) + ".desktop";
QFile myfile(savefile);
myfile.setPermissions(QFile::ExeGroup);
myfile.setPermissions(QFile::ExeOther);
myfile.setPermissions(QFile::ExeOwner);
myfile.setPermissions(QFile::ExeUser);

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But it doesnt work. May you help me find a solution for this. Thank you very much.