#include <QApplication>
#include <QDebug>
#include <QFile>
#include <QListWidget>

void test(QListWidget *l, QString name) {
    QFile f(QCoreApplication::applicationDirPath() + "/" + name); if(!f.open(QIODevice::ReadOnly)) {
        qDebug() << "ERR: " << name << " failed to open";
        return;
    }

    while(!f.atEnd()) {
        QByteArray b = QByteArray::fromHex(f.readLine().replace('\n', ""));

        // No Crash
        //l->insertItem(0, b);
        // Crash
        l->insertItem(0, QString::fromUtf8(b));
    }
}

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

    QListWidget *l = new QListWidget;
    l->resize(800, 300);
    l->show();

    test(l, "users.50.txt");

    return a.exec();
}