Qt: populating QCombox items using std output from external process

mainwindow.cpp

// Launch external process, and populate QComboBox using output from the process:
void MainWindow::PopulateBitFormats(const QString& fileName)
{
    QProcess ConverterQuery;
    ui->BitDepthCombo->clear();
    int extidx = fileName.lastIndexOf(".");
    if(extidx > -1){
        QString ext = fileName.right(fileName.length()-extidx-1); // get file extension from filename
        ConverterQuery.start(ConverterPath, QStringList() << "--listsubformats" << ext); // ask converter for a list of subformats for the given file extension

        if (!ConverterQuery.waitForFinished())
            return;

        ConverterQuery.setReadChannel(QProcess::StandardOutput);
        while(ConverterQuery.canReadLine()){
            QString line = QString::fromLocal8Bit(ConverterQuery.readLine());
            ui->BitDepthCombo->addItem(line.simplified());
        }
    }
}