How can i solve no matching member function for call to 'append' ??

[deleted286]

Hi guys. I got an error in series-> append part. It says no matching member function for call to append. How can i solve it?

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <QTextStream>
#include <QtCharts/QLineSeries>
#include <QtCharts/qlineseries.h>
#include <QLine>
#include <qline.h>

using namespace QtCharts;


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_2_clicked()
{


     QLineSeries *series = new QLineSeries();

     QFile file("C:/Users/ilknu/Documents/Dendennnnden/ornek.txt");
     if(file.open(QIODevice::ReadOnly)) {
        QTextStream in (&file);
        while(!in.atEnd()) {
            QString line = in.readLine();
            QStringList list = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);
            for(const QString &entry : list) {
            double num = entry.toDouble();
            series->append(num);
        }
    }
}
}

[SGaist]

Hi,

@suslucoder said in How can i solve no matching member function for call to 'append' ??:

double num = entry.toDouble();
series->append(num);

Please, read the documentation, there's no append overload which takes a double.

[deleted286]

@SGaist I saw that series take 2 argumants like series->append(0,6);
But it gives me the same error.
What is the problem here

[SGaist]

Please show your current code and the exact error.

[deleted286]

@SGaist Here is the current code

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <QTextStream>
#include <QMessageBox>
#include <QTimer>
#include <QList>
#include <qlist.h>
#include <QDebug>
#include <QtCharts/QLineSeries>
#include <QtCharts/QChart>
#include <QtCharts/QDateTimeAxis>
#include <QDateTime>
#include <QtCharts/QValueAxis>
#include <QtCharts/QChartView>
#include <QLine>
#include <QString>


QT_CHARTS_USE_NAMESPACE
using namespace QtCharts;

QTimer *timer = new QTimer();




MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);



    connect(timer, SIGNAL(timeout()), SLOT(Timer_Slot()));

}


void MainWindow::Timer_Slot() {

   QString line = allLines[curIndex];
  ui->plainTextEdit->setPlainText(line);
  if (curIndex < allLines.size() - 1 ) {
          curIndex++;
   }



}




MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_2_clicked()  //write
{
    QFile file("C:/Users/ilknu/Documents/QFileDemo/abc.txt");
    if(!file.open(QFile::WriteOnly | QFile::Text )) {

        QMessageBox::warning(this, "title", "file not open");


    }

    QTextStream out (&file);
    QString text = ui->plainTextEdit->toPlainText();
    out << text;
    file.flush();
    file.close();


}

void MainWindow::on_pushButton_clicked()  //read
{

    QLineSeries *series = new QLineSeries();

    QFile file("C:/Users/ilknu/Documents/QFileDemo/abc.txt");
     if (file.open(QIODevice::ReadOnly)) {
         QTextStream in (&file);
         while (!in.atEnd()) {
             //QString line = in.readLine();
             //allLines.append(line);

             QString line = in.readLine();
             allLines.append(line);

             QStringList list = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);
             for(const QString &entry : list) {
             double num = entry.toDouble();

          qDebug()<<num;

series->append(num);

             }


         }



}



  file.close();
  curIndex=0;
  timer->start(200);


}

[SGaist]

@suslucoder said in How can i solve no matching member function for call to 'append' ??:

series->append(num);

That line is still wrong. The append method takes two arguments representing a coordinate or one that is a QPointF or finally a list of QPointF.