Can't create folder

[cpuinthebrain]

Hi,

I read many many tutorials in internet how we can create new folder(directory) using QT.Unfortunately i can't have success with no one.I'm on Mac OS X 10.10 with Qt 5.7.

What i make is:

QString path1 = "Documents";
 
        QDir dir(path1);
        if(!dir.exists())
        {
            qDebug() << "Creating " << path1 << "directory";
            dir.mkdir(path1);
        }
        else
        {
            qDebug() << path1 << " already exists";
        }

QString path1 = "Documents";

        QDir dir(path1);
        if(!dir.exists())
        {
            qDebug() << "Creating " << path1 << "directory";
            dir.mkdir(path1);
        }
        else
        {
            qDebug() << path1 << " already exists";
        }

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I also can't understand how to create folder in Users/Library/Application Support/My_program_name_folder
using QStandardPaths in this case QStandardPaths:ataLocation.