How can I add item in the QCombobox?

[victor wang]

Hi All,
I'm using qt5.5 and Linux+QT for my OS system.
This is how I designed.

void MainWindow::openscanwindow()
{
    int i = 0;
    bool empty = false;
    QString scan_info;
    QString info;
    stackedWidgetTestbtselect=ui->stackedWidgetPagePanel;
    ui->stackedWidget->setCurrentWidget(stackedWidgetTestbtselect);
    btselect = new QComboBox(this);
    btselect->setEditable(true);
    Process::executeProcessSync(QString("sh"),QStringList()<<"-c"<<"/bin/touch /home/bt.txt",&info);
    qDebug()<<"touch: "+info;
    Process::executeProcessSync(QString("sh"),QStringList()<<"-c"<<"/usr/bin/hciconfig hci0 piscan",&info);
    qDebug()<<"piscan: "+info;
    Process::executeProcessSync(QString("sh"),QStringList()<<"-c"<<"/usr/bin/hcitool scan > /home/bt.txt",&info);
    qDebug()<<"scan: "+info;
    QString jump;
    QFile scan("/home/bt.txt");
    if(!scan.open(QIODevice::ReadOnly|QIODevice::Text))
    {
        qDebug("cannot open bt.txt");
    }
    else
    {
        jump = scan.readLine();
        while(!empty)
        {
            scan_info=scan.readLine();
            qDebug()<<scan_info;
            if(scan_info.isEmpty())
            {
                empty = true;
            }
            else
            {
                scan_info = scan_info.mid(19).trimmed();
                qDebug()<<scan_info;
                btselect->addItem(scan_info);
            }
        }

    }


}

I can't show anything out in my Combobox.

How can I solve this problem?

Thanks in Advanced!

[Taz742]

@victor-wang said in How can I add item in the QCombobox?:

        else
        {
            scan_info = scan_info.mid(19).trimmed();
            qDebug()<<scan_info;
            btselect->addItem(scan_info);
        }

Does it print anything?

[victor wang]

@Taz742
Yes it will print what I want!

[victor wang]

@Taz742
There is a strange thing happened that I can print the log out but I can't show anything in my combobox.

[Taz742]

@victor-wang

void MainWindow::openscanwindow()
{
    bselect = new QComboBox(this);
    bselect->addItem("New Item");
}

Could it be just a test to work in this case?

[Taz742]

@Taz742 said in How can I add item in the QCombobox?:

void MainWindow::openscanwindow()
{
bselect = new QComboBox(this);
bselect->addItem("New Item");
}

Could it be just a test to work in this case?

and bselect.show();

[victor wang]

@Taz742
I seem to solve the problem.
I had make a silly mistake.
I should do like this.

else
        {
            scan_info = scan_info.mid(19).trimmed();
            qDebug()<<scan_info;
            ui->combobox->addItem(scan_info);
        }

[Taz742]

@victor-wang
Yes.
The more detailed problem was the following

    btselect = new QComboBox(this);

You may have been using it for some time but btselect = new QComboBox (this); He spoiled everything.
Combobox cleaned. He's the other and no longer watches the previous address.
If you use it only in the constructor then everything would be fine :))

[Taz742]

@victor-wang
sorry for english.
Hopefully there will be someone who is godly and you will explain in detail.