QT: Runtime error reading text file in QStringList

Question

with my application in Qt I'm currently trying to read a really big formatted text file (20.000.000 of lines) and collecting data in some QStringLists (plural).

Each lines generates 4 QStringList components of 10 characters each.

Always at the same point the application crashes with the "Runtume Error!".

I'm saying the same point because if I try to remove the last line read, I got the error at the next one. (I'm talking about crashing at the 16.000.000th line )

I'm not sure (nor so skilled...), but I think I sort of reached the memory capability, could it be the case? is there some work-around or some better way in doing that?

here is part of the code where I collect the data from the text file:

int lcCount=0;
QStringList loadcase, elid, plyid, eltyp, sigmax, sigmay, sigmaz, sigmaxy, sigmaxz, sigmayz;
QString currentLC, currentELtyp;
QStringList status; status<<"LCoff"<<"ELoff"<<"PLYoff";
QStringList lineList;

while(!in.atEnd())
{
    //PROGRESS BAR
    int pBarValue = countRow*100/countTotRow;
    //qDebug()<<countRow<<" - " << countTotRow;
    m_pBar->avanzamentoPCH(pBarValue);
    qApp->processEvents();

    QString line = in.readLine(); countRow++;
    if(line.contains("$TITLE")){status.replace(0,"LCoff");status.replace(1,"ELoff");}

    if (line.contains("$SUBCASE ID ="))
    {
        status.replace(0,"LCon");
        line.chop(30);
        line.remove(" ");
        line.remove("$SUBCASEID=");
        currentLC = line;
        lcCount++;
    } else if (line.contains("$ELEMENT TYPE =") && status.at(0)=="LCon")
    {
        line.chop(30);
        line.remove("$ELEMENT TYPE =");
        lineList = line.split(" ",QString::SkipEmptyParts);
        // creazione stringa del tipo di elemento
        currentELtyp = lineList.at(1);
        currentELtyp.chop(2);
        currentELtyp.prepend("C");

        if((lineList.at(1).contains("QUAD4LC")) || (lineList.at(1).contains("TRIA3LC")))
        {
            status.replace(1,"ELon");
        }
        lineList.clear();
    } else if(status.at(0)=="LCon" && status.at(1)=="ELon")
    {
        line.chop(8); // elimina gli ultimi 8 caratteri evitando possibili errori quando il numero delle righe del pch si attacca all'ultimo valore
        loadcase << currentLC;
        eltyp<<currentELtyp;

        lineList = line.split(" ",QString::SkipEmptyParts); //,QString::SkipEmptyParts
        elid << lineList.at(0);
        plyid << lineList.at(1);
        sigmax << lineList.at(2);
        sigmay << lineList.at(3);

        lineList.clear();

        line = in.readLine();countRow++;
        line.chop(8); // elimina gli ultimi 8 caratteri evitando possibili errori quando il numero delle righe del pch si attacca all'ultimo valore
        lineList = line.split(" ",QString::SkipEmptyParts);
        sigmaxy << lineList.at(1);
        sigmaxz << lineList.at(2);
        sigmayz << lineList.at(3);
        lineList.clear();
        //
        line = in.readLine();countRow++;
        line = in.readLine();countRow++;
        // solo per laminati!!
        sigmaz << "0.0";
    }
}

and here is an example of the text file: a part like this format goes on and on

650001                 1             -1.919393E+05      5.581818E+05       8
-CONT-                 -1.747859E+03     -8.388188E+01     -4.930236E+01       9
-CONT-                 -8.986650E+01      5.581859E+05     -1.919434E+05      10
-CONT-                  3.750646E+05                                          11