Sorting a QList

[vitalic]

Hallo,

in my app the user has the possibility to add a station to a QListWidget. This works very well. After adding the station the list has to be updated. The problem, the QListWidget reads the stations and its frequency from a txt file.

So i need to sort the stations in the txt file not in the QListWidget, as I use the row index to tune to the station.

How can I sort the output before it is saved to the txt file?

The strings to campore look something like:

Jump,105600000
Station 1 93 MHz,93000000
man station@ 101.2MHz,101200000

ui->btn_rename->setVisible(true);
 
        QString add_station = ui->ln_man_tune->text();
        float add_station_float = add_station.toFloat();
        int multi = add_station_float * 1000000;
        QString station_conv_string = (QString::number(multi));
 
        if(!add_station.isEmpty()){
            QFile out_tmp("../tmp.txt");
            QFile file_fm(path_fm);
 
            if(!file_fm.open(QFile::ReadOnly | QFile::Text)){                
                return;
            }
 
            if(!out_tmp.open(QFile::WriteOnly | QFile::Text)){                
                return;
            }
 
            QTextStream in_file_fm(&file_fm);
            file_fm.resize(0);
            QTextStream out(&out_tmp);
            QStringList unsort_scan_fm;
 
            while(!in_file_fm.atEnd()){
                QString line = in_file_fm.readLine();                
 
                QString outline = line;                        
 
                unsort_scan_fm.append(outline);                
            }
 
            if(add_station.contains(",")){
                add_station = add_station.replace(",", ".");
            }
            if(!add_station.contains(".")){
                add_station = add_station.append(".0");
            }
 
            //add new station at end of file
            QString outline = "man station@ " + add_station + "MHz," + station_conv_string;                    
 
            unsort_scan_fm.append(outline);
            qDebug() << "before sort:    :" << unsort_scan_fm;
 
            std::sort(unsort_scan_fm.begin(), unsort_scan_fm.end());            
 
            qDebug() << "after sort:    :" << unsort_scan_fm;
 
            foreach(QString after_sort, unsort_scan_fm){
                out << after_sort << "\n";
            }
 
            file_fm.close();
            out_tmp.flush();
            out_tmp.close();
 
            file_fm.remove();            
            out_tmp.rename(path_fm);
 
            ui->ls_fm->clear();
 
            MainWindow::fill_list();
            MainWindow::fm_list();
        }

ui->btn_rename->setVisible(true);

        QString add_station = ui->ln_man_tune->text();
        float add_station_float = add_station.toFloat();
        int multi = add_station_float * 1000000;
        QString station_conv_string = (QString::number(multi));

        if(!add_station.isEmpty()){
            QFile out_tmp("../tmp.txt");
            QFile file_fm(path_fm);

            if(!file_fm.open(QFile::ReadOnly | QFile::Text)){                
                return;
            }

            if(!out_tmp.open(QFile::WriteOnly | QFile::Text)){                
                return;
            }

            QTextStream in_file_fm(&file_fm);
            file_fm.resize(0);
            QTextStream out(&out_tmp);
            QStringList unsort_scan_fm;

            while(!in_file_fm.atEnd()){
                QString line = in_file_fm.readLine();                
                
                QString outline = line;                        

                unsort_scan_fm.append(outline);                
            }

            if(add_station.contains(",")){
                add_station = add_station.replace(",", ".");
            }
            if(!add_station.contains(".")){
                add_station = add_station.append(".0");
            }

            //add new station at end of file
            QString outline = "man station@ " + add_station + "MHz," + station_conv_string;                    

            unsort_scan_fm.append(outline);
            qDebug() << "before sort:    :" << unsort_scan_fm;

            std::sort(unsort_scan_fm.begin(), unsort_scan_fm.end());            

            qDebug() << "after sort:    :" << unsort_scan_fm;

            foreach(QString after_sort, unsort_scan_fm){
                out << after_sort << "\n";
            }

            file_fm.close();
            out_tmp.flush();
            out_tmp.close();

            file_fm.remove();            
            out_tmp.rename(path_fm);

            ui->ls_fm->clear();

            MainWindow::fill_list();
            MainWindow::fm_list();
        }

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Debug before sort and after sort are the same:

after sort:    : ("Jump,105600000", "Station 1 93 MHz,93000000", "Station 3 98.1 MHz,98100000", "Station 4 99.9 MHz,99900000", "Top40,94800000", "any station,107600000", "man station@ 100.2MHz,100200000", "man station@ 101.2MHz,101200000", "man station@ 101.3MHz,101300000", "man station@ 101.3MHz,101300000", "man station@ 104.6MHz,104600000", "man station@ 105.3MHz,105300000", "man station@ 105.4MHz,105400000", "man station@ 111.1MHz,111100000", "man station@ 96.8MHz,96800000", "man station@ 97.8MHz,97800000", "man station@ 99.9MHz,99900000", "zulu station,100700000")

after sort:    : ("Jump,105600000", "Station 1 93 MHz,93000000", "Station 3 98.1 MHz,98100000", "Station 4 99.9 MHz,99900000", "Top40,94800000", "any station,107600000", "man station@ 100.2MHz,100200000", "man station@ 101.2MHz,101200000", "man station@ 101.3MHz,101300000", "man station@ 101.3MHz,101300000", "man station@ 104.6MHz,104600000", "man station@ 105.3MHz,105300000", "man station@ 105.4MHz,105400000", "man station@ 111.1MHz,111100000", "man station@ 96.8MHz,96800000", "man station@ 97.8MHz,97800000", "man station@ 99.9MHz,99900000", "zulu station,100700000")

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