Can't create a .txt file in specified directory or mkdir()

[MartinChan]

I want to create a main.txt file in "data" sub-directory under current working directory and mkdir() can't work.Here is my code.

 QString currentWorkingPath=QCoreApplication::applicationFilePath();
 QDir dir(currentWorkingPath);
 qDebug()<<dir.currentPath();//It output the correct path until here

 if(dir.mkdir("data"))
  qDebug()<<"MAKE THE DIR";//It can't mkdir() here.

    QFile mainFile(QString(currentWorkingPath+"/data/main.txt"));//It can't create new sub-dir or txt file either.
    if (mainFile.open(QIODevice::WriteOnly|QIODevice::Text)){

    }
    mainFile.close();

Can someone give me some advice?I can only create txt in output home directory now.

[SGaist]

Hi,

Ensure you are not trying to write in a read-only folder. On most OS, the path where an application is installed is not writable by users partly because I could wreak havoc on the device/machine. The QStandardPaths class allows to retrieve usable writable paths for your application to write into depending on the type of data you want to generate.

[MartinChan]

@SGaist Thx and I can use QStandardPath to get a writable path.