I want to get lines of text

[newplayer]

I wrote opening file and showing subject of file in textedit - function:

void MyWindow::Open ()
{
     QString nameFile = QFileDialog::getOpenFileName (this); 
 
     if (!nameFile.isEmpty ()) 
     {
         QFile file (nameFile);
 
         if (file.open (QFile::ReadOnly | QFile::Text))
         {
             QTextStream in (&file);
             textEdit1 -> setPlainText (in.readAll ());
             file.close();
         }
 
     }
}

void MyWindow::Open ()
{
     QString nameFile = QFileDialog::getOpenFileName (this); 
     
     if (!nameFile.isEmpty ()) 
     {
         QFile file (nameFile);

         if (file.open (QFile::ReadOnly | QFile::Text))
         {
             QTextStream in (&file);
             textEdit1 -> setPlainText (in.readAll ());
             file.close();
         }

     }
}

To copy to clipboard, switch view to plain text mode 

But I want to take one line of text. How can I take one line of text ? Because I want to sort lines of text, for example - first:

bbb bbb aaa
bbb aaa cc
aaa gg

Then it will be:

aaa gg
bbb aaa cc
bbb bbb aaa

I need to take one line of text - here it is "bbb bbb aaa", then I will trow it into vector (from library STL from c++), then I will use function sort() (from library STL from c++) and I will get sorted lines of text.

BUT HOW CAN I TAKE ONE LINE OF TEXT FROM FILE ?