Qt reading file and mapping to QVector very slow (crashes) - c++

Question

So what I am trying to do is read a file and map it to a two dimensional QVector. Here is my code so far
void dataModel::parseFileByLines()
{
QVector<QVector<QString> > dataSet;
lastError = "";
QRegExp reg(fileDelimiter);
QFile inFile(inputFile);
if (inFile.open(QIODevice::ReadOnly)){
QTextStream fread(&inFile);
long totalSize = inFile.size();
QString line;
while(!fread.atEnd()){
line = fread.readLine();
dataSet.append(line.split(reg,QString::KeepEmptyParts).toVector());
}
}else{
lastError = "Could not open "+inputFile+" for reading";
}
}
My issue is that when dealing with 1000,000 lines or more the program crashes with a message saying "This application has requested the Runtime to terminate it in an unusual way". Is there a more efficient way I can achieve my goal ? If so how ?
The input file may be in a format like so
ID,NAME,AGE,GENDER...etc
1,Sam,12
...
...
1000000
I would really appreciate any help or advice

Answer 1

I have tested this (QList) version here on my computer and it runs much faster then the QVector version and I also believe it will not crash.
void parseFileByLines(QString inputFile)
{
QList<QList<QString> > dataSet;
QString lastError = "";
QFile inFile(inputFile);
if (inFile.open(QIODevice::ReadOnly)){
QTextStream fread(&inFile);
long totalSize = inFile.size();
QString line;
while(!fread.atEnd()){
line = fread.readLine();
QList<QString> record = line.split('\t',QString::KeepEmptyParts);
dataSet.append(record);
}
}else{
lastError = "Could not open "+inputFile+" for reading";
}
}