Didn't fully understood ui file handling - and now stuck

LS-KS

Hey folks,
Last year I build a bigger PySide6 project together with QtQuick QML which is just finished. Now I want to proceed with Qt together with C++.
For me it's embarrassing: I'm stuck and I don't find the solution.

I wrote a small program which reads a specific formatted textfile (some crap format someone thought it would be a good idea 20 years ago) which represents a time series.
In my main window I plot the data, correct some stuff and perform some signal processing. That all works fine.

But I want to do more: Some trajectories, system identification, create takagi sugeno controllers... and other fancy engineering stuff. But I'm not able to create a second Window.

I started with the basic empty Qt Project with main main window.h / .cpp /.h .
From my Menubar i want to use an Action trigger to create an object of the second window. Here is the relevant code:

//parts from mainwindow.cpp:

void MainWindow::on_actionTrajektorie_triggered()
{
    trajectory* traj = new trajectory;
    traj -> show();
}

// trajectory.h

#ifndef TRAJECTORY_H
#define TRAJECTORY_H

#include <QtCharts/QChartView>
#include <QtCharts/QLineSeries>
#include <QtCharts/QBarSeries>
#include <QMainWindow>
#include <QWidget>
#include <QColor>


QT_BEGIN_NAMESPACE
namespace Ui { class trajectory; }
QT_END_NAMESPACE

class trajectory : public QMainWindow
{
    Q_OBJECT
public:
    explicit trajectory(QWidget *parent = nullptr);
    ~trajectory();

private:
    Ui::trajectory *ui;
};
#endif // TRAJECTORY_H

//trajectory.cpp

#include "trajectory.h"
#include "ui_trajectory.h"
#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QDebug>

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

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

I post also my .pro file:

QT       += core gui
QT += charts


greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp \
    trajectory.cpp

HEADERS += \
    mainwindow.h \
    trajectory.h
    complex.h
FORMS += \
    mainwindow.ui \
    trajectory.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

DISTFILES += \
    data/uf13.txt

I tried to compile several times, cleaned and recreated the project but this doesn't help. I also looked into samples of Qt but don't find the issue.
I get the following errors:

<html><body><code style="white-space:pre;font-family:Monaco"><a href="olpfile:///Users/lennartschink/Documents/GitHub/GraphApp/graph_app/trajectory.cpp::9::-1">../graph_app/trajectory.cpp</a>:9:14: error: allocation of incomplete type 'Ui::trajectory'
    , ui(new Ui::trajectory)
             ^~~~~~~~~~~~~~
///Users/..projectpath.../trajectory.h::13::-1">../graph_app/trajectory.h13:22: 
note: forward declaration of 'Ui::trajectory'
namespace Ui { class trajectory; }

and

Users/..projectpath.../trajectory.cpp::11::-1"
>../graph_app/trajectory.cpp</a>:11:7: error: member access into incomplete type 'Ui::trajectory'
    ui->setupUi(this);

//Users/..projectpath.../trajectory.h::13::-1"
>../graph_app/trajectory.h</a>:13:22:
note: forward declaration of 'Ui::trajectory'
namespace Ui { class trajectory; }

as well as Error 1 in trajectory.o

Can anybody help?
Thank you very much!

SGaist

Hi,

You mark the topic has solved without additional information. Is that really the case ? If so, what did fix your issue ? That might help other people.