QT cross compilation error for raspberry pi - QStringList and QFile members missing

[RiyG22]

Hi,
I am working with QT for cross compiling the application for raspberry pi.
I want to create a CSV file and save the data for further analysis.

Below is the sample code :

#include <QList>
#include <QColor>
#include <QString>
#include <QStringList>
#include <QFile>
#include <QTextStream>
#include <QDebug>

QList<QRgb> GetPixels()
{
    QList<QRgb> pixels;
    pixels << qRgb(11, 255, 0) << qRgb(167, 209, 89) << qRgb(34, 55, 12);

    return pixels;
}

QList<QStringList> PixelsToStrings(const QList<QRgb>& pixels)
{
    QList<QStringList> strings;
    for (int i = 0; i < pixels.size(); ++i)
    {
        QStringList values;
        values << QString::number(qRed(pixels.at(i))) <<
                  QString::number(qGreen(pixels.at(i))) <<
                  QString::number(qBlue(pixels.at(i)));

        strings << values;
    }

    return strings;

}

void WriteToCSV(const QList<QStringList>& pixels)
{
    // Open csv-file
    QFile file("pixels.csv");
    file.open(QIODevice::Append | QIODevice::Text);

    // Write data to file
    QTextStream stream(&file);
    QString separator(",");
    for (int i = 0; i < pixels.size(); ++i)
    {
        stream << pixels.at(i).join(separator) << endl;
    }

    stream.flush();
    file.close();
}

QList<QStringList> ReadCSV()
{
    // Open csv-file
    QFile file("pixels.csv");
    file.open(QIODevice::ReadOnly | QIODevice::Text);

    // Read data from file
    QTextStream stream(&file);
    QList<QStringList> data;
    QString separator(",");
    while (stream.atEnd() == false)
    {
        QString line = stream.readLine();
        data << line.split(separator);
    }

    file.close();
    return data;
}

void Print(const QList<QStringList>& data)
{
    for (int i = 0; i < data.size(); ++i)
    {
        qDebug() << data.at(i).join(", ");
    }
}

int main()
{
    QList<QRgb> pixels = GetPixels();
    QList<QStringList> pixelsStr = PixelsToStrings(pixels);
    WriteToCSV(pixelsStr);

    QList<QStringList> readData = ReadCSV();
    Print(readData);

    return 0;
}

This code is working fine on native compiler - Linux (ubuntu) but when cross compiling for raspberry pi, Errors facing -

1. .Join member is missing in QStringList , there are other members like isEmpty etc also missing.
2. .open - No matching member function for call to 'open'.

If anyone faced similar issues and knows the solution, please share with me. It would be really appreciated.

Similar post I found - https://forum.qt.io/topic/118482/qstringlist-missing-methods

[KroMignon]

@RiyG22 said in QT cross compilation error for raspberry pi - QStringList and QFile members missing:

when cross compiling for raspberry pi

How did you install / setup RPi cross-compiling tools?

[RiyG22]

@KroMignon , Thank you for your quick reply.
I followed these below links and created a kit successfully -
https://www.ics.com/blog/configuring-qt-creator-raspberry-pi
https://wiki.qt.io/RaspberryPi2EGLFS

[KroMignon]

@RiyG22 Which one did you use? Which Qt Version did you build?
Have you try to build your project on RPi himself?

[RiyG22]

@KroMignon ,
Used One- https://wiki.qt.io/RaspberryPi2EGLFS
Qt version - Qt 5.13.1
No, I've not tried to build the project on RPI itself. I 've cross compiling the project without adding CSV file functionality and successfully run it on RPi.

[RiyG22]

Solved the issue with disabling Clang code model.

[JonB]

@RiyG22
I don't know whether it also applies to your situation, but as of Ubuntu 20.04 you now have to additionally apt-get a clang8 package --- I forget the exact name, but you can Google --- to make clang work correctly.