=================OTWIERANIE PLIKU PRZEZ EKSPLORER ORAZ WPISYWANIE DO LINEEDIT=======================

    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),"/path/to/file/");
    ui->pathEncryptLineEdit->             setText(fileName);

====================ZAPISYWANIE DO PLIKU ====================
 QString fileName = QFileDialog::getSaveFileName(this,
           tr("Save file"), "",
           tr("Text (*.txt)"));
    if (fileName.isEmpty())
            return;
        else {
            QFile file(fileName);
            if (!file.open(QIODevice::WriteOnly)) {
                QMessageBox::information(this, tr("Unable to open file"),
                    file.errorString());
                return;
            }

           QTextStream out(&file);
            out<<ZASZYFROWANA WIADOMOŚĆ

//***** Funkcja szyfrująca *****//
QString MainWindow::encrypt(QString text, QString key){
    QByteArray textBinary = text.toUtf8();
    QByteArray keyBinary  = key.toUtf8();
    QByteArray encryptTextBinary = QByteArray();


    encryptTextBinary.resize(textBinary.size());


    for (int i = 0; i<textBinary.length(); i++){
        encryptTextBinary[i] = textBinary[i] ^ keyBinary[i % keyBinary.size()];
    }
    qDebug()<<encryptTextBinary.toBase64(QByteArray::Base64Encoding | QByteArray::KeepTrailingEquals);
    return encryptTextBinary.toBase64(QByteArray::Base64Encoding | QByteArray::KeepTrailingEquals);
}
//***** Funkcja deszysfrująca *****//
QString MainWindow::decrypt(QString text, QString key){
    QByteArray textBinary = QByteArray::fromBase64(text.simplified().remove(" ").remove("\n").toUtf8(), QByteArray::Base64Encoding | QByteArray::KeepTrailingEquals);
    QByteArray keyBinary  = key.toUtf8();
    QByteArray decryptTextBinary = QByteArray();

    decryptTextBinary.resize(textBinary.size());


    for(int i = 0; i<textBinary.length(); i++){
        decryptTextBinary[i] = textBinary[i] ^ keyBinary[i % keyBinary.size()];
    }
    qDebug()<<decryptTextBinary;
    return decryptTextBinary;
}