Reading strings from a QStringList to send over serial

ndijkhoffz

I created a push button that when clicked it should send a list of commands over serial that complete the action of the button. I have my list of strings defined in my mainwindow.h file as follows:

    QStringList database_dump = {
                                 "STRING1",
                                 "STRING2",
                                 "STRING3.",
                                 "STRING4",
                                 "STRING5",
                                 "STRING6",
                                 "STRING7"
                                };

From my button click signal I want to extract each string and send it over to my "write_to_port" function as seen below:

void MainWindow::on_dump_database_clicked()
{
    QString * file_name;
    QByteArray key_value;

    while(!database_dump.isEmpty())
    {
        file_name = new QString(database_dump.takeFirst());
        key_value = file_name->toLatin1();
        key_value.append(NEW_LINE_CR);
        write_to_port(key_value);
    }
}

After each string there needs to be a simulated enter key as shown.

The problem is; the .takefirst() member takes the string and removes it from the list. The first time I click the button it works perfectly. However the second time it does nothing because the QStringList is empty. How do I reset the list of strings after each time the button is clicked. Thanks in advance.

Nicholas

Christian Ehrlicher

Why not simply iterator of the QStringList instead removing the items?

for(const QString &str : database_dump)
{
  QByteArray key_value = str.toLatin1();
  key_value.append(NEW_LINE_CR);
  write_to_port(key_value);
}

ndijkhoffz

@Christian-Ehrlicher I already got an answer. It is similar to your solution:

void MainWindow::on_dump_database_clicked()
{
    foreach(const QString &file_name, database_dump)
    {
        QByteArray key_value(file_name.toLatin1());
        key_value.append(NEW_LINE_CR);
        ui->terminalTxtBox->write_to_port(key_value);
    }
}

Thanks for the help.

Christian Ehrlicher

Please mark the thread as solved when you found a solution :)