Qt program run errors - c++

Question

I have 2 Qt programs that are basically identical, I copied the code from one of them to the other to modify it and save it as a new project, now the second one doesn't run and gives a bunch of errors which don't make sense because the other one runs and they are the same where the errors are coming up. Here is the code:
#ifndef FILM_H
#define FILM_H
#include <QWidget>
#include <QString>
#include <QDate>
class Film: public QObject{
Q_OBJECT
Q_PROPERTY( QString title READ getTitle WRITE setTitle);
Q_PROPERTY( int duration READ getDuration WRITE setDuration);
Q_PROPERTY( QString director READ getDirector WRITE setDirector);
Q_PROPERTY( QDate releaseDate READ getReleaseDate WRITE setReleaseDate);
public:
Film(QString t,int dur,QString dir,QDate r);
Film();
void setTitle(QString t);
void setDuration(int dur);
void setDirector(QString dir);
void setReleaseDate(QDate r);
QString getTitle() const;
int getDuration() const;
QString getDirector() const;
QDate getReleaseDate() const;
QString toString();
private:
QString m_title;
int m_duration;
QString m_director;
QDate m_releaseDate;
};
#endif // FILM_H
#ifndef FILMWRITER_H
#define FILMWRITER_H
#include "Film.h"
#include <QtGui>
#include <QFile>
class FilmWriter{
public:
void accessFilm(Film& f);
};
#endif // FILMWRITER_H
#ifndef FILMINPUT_H
#define FILMINPUT_H
#include <QMainWindow>
#include "Film.h"
#include "FilmWriter.h"
#include <QLabel>
#include <QTextEdit>
#include <QPushButton>
namespace Ui {
class FilmInput;
}
class FilmInput : public QMainWindow
{
Q_OBJECT
public:
explicit FilmInput(QWidget *parent = 0);
~FilmInput();
void obtainFilmData(Film& f);
void saveFilm(Film& f);
public slots:
void getFilm();
private:
Ui::FilmInput *ui;
//widgets
QMainWindow* window;
QLabel* infoLabel;
QLabel* titleLabel;
QLabel* durationLabel;
QLabel* directorLabel;
QLabel* relDateLabel;
QTextEdit* titleEdit;
QTextEdit* durationEdit;
QTextEdit* directorEdit;
QTextEdit* relDateEdit;
QPushButton* saveBtn;
QPushButton* cancelBtn;
Film f;
//sets up gui and connects signals and slots
void setUpGui();
};
#endif // FILMINPUT_H
#include "Film.h"
#include <QDate>
#include <QString>
Film::Film(QString t,int dur,QString dir,QDate r):m_title(t),m_duration(dur),m_director(dir),m_releaseDate(r){
}
Film::Film(){
}
void Film::setTitle(QString t){
m_title = t;
}
void Film::setDuration(int dur){
m_duration = dur;
}
void Film::setDirector(QString dir){
m_director = dir;
}
void Film::setReleaseDate(QDate r){
m_releaseDate = r;
}
QString Film::getTitle() const{
return QString("%1").arg(m_title);
}
int Film::getDuration() const{
return m_duration;
}
QString Film::getDirector() const{
return QString("%1").arg(m_director);
}
QDate Film::getReleaseDate() const{
return m_releaseDate;
}
QString Film::toString()
{
return m_title + " " + m_duration + " " + m_director + " " + m_releaseDate.toString();
}
#include "FilmWriter.h"
#include <QtGui>
#include <QFileDialog>
#include <QFile>
#include <QMessageBox>
#include <QObject>
#include <QTextStream>
void FilmWriter::accessFilm(Film& f){
QVariant v1 = f.property("title");
QVariant v2 = f.property("duration");
QVariant v3 = f.property("director");
QVariant v4 = f.property("releaseDate");
QString str = v1.toString() +" "+ v2.toString() +" "+ v3.toString() +" "+ v4.toString();
QMessageBox msgBox;
msgBox.setText(str);
msgBox.exec();
}
#include "filminput.h"
#include "ui_filminput.h"
#include <QtGui>
#include "Film.h"
#include "FilmWriter.h"
#include <QTextEdit>
#include <QDate>
#include <QString>
FilmInput::FilmInput(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::FilmInput)
{
ui->setupUi(this);
setUpGui();
}
FilmInput::~FilmInput()
{
delete ui;
}
void FilmInput::setUpGui(){
//initialise widgets
infoLabel = new QLabel("Please enter film data which will be saved to a file",this);
titleLabel = new QLabel("Film Title",this);
durationLabel = new QLabel("Film Duration",this);
directorLabel = new QLabel("Film Director",this);
relDateLabel = new QLabel("Film Release Date",this);
titleEdit = new QTextEdit(this);
durationEdit = new QTextEdit(this);
directorEdit = new QTextEdit(this);
relDateEdit = new QTextEdit(this);
saveBtn = new QPushButton("Save Film",this);
cancelBtn = new QPushButton("Cancel",this);
//set layout
QFormLayout* layout = new QFormLayout();
layout->addWidget(infoLabel);
layout->addWidget(titleLabel);
layout->addWidget(titleEdit);
layout->addWidget(durationLabel);
layout->addWidget(durationEdit);
layout->addWidget(directorLabel);
layout->addWidget(directorEdit);
layout->addWidget(relDateLabel);
layout->addWidget(relDateEdit);
layout->addWidget(saveBtn);
layout->addWidget(cancelBtn);
this->ui->widget->setLayout(layout);
this->setWindowTitle("Film Archive");
connect(saveBtn,SIGNAL(clicked()),this, SLOT(getFilm()));
connect(cancelBtn,SIGNAL(clicked()),this,SLOT(close()));
}
void FilmInput::getFilm(){
Film f1(titleEdit->toPlainText(),durationEdit->toPlainText().toInt() ,directorEdit->toPlainText(),
QDate::fromString(relDateEdit->toPlainText(),"dd/MM/YYYY"));;
obtainFilmData(f1);
}
void FilmInput::obtainFilmData(Film &f){
FilmWriter f2;
f2.accessFilm(f);
}
#include <QtGui/QApplication>
#include "filminput.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
FilmInput w;
w.show();
return a.exec();
}
the error dump:
..\Ass1Q2\filminput.cpp: In constructor 'FilmInput::FilmInput(QWidget*)':
..\Ass1Q2\filminput.cpp:12: error: invalid use of incomplete type 'struct Ui::FilmInput'
..\Ass1Q2\/filminput.h:12: error: forward declaration of 'struct Ui::FilmInput'
..\Ass1Q2\filminput.cpp:14: error: invalid use of incomplete type 'struct Ui::FilmInput'
..\Ass1Q2\/filminput.h:12: error: forward declaration of 'struct Ui::FilmInput'
..\Ass1Q2\filminput.cpp: In destructor 'virtual FilmInput::~FilmInput()':
..\Ass1Q2\filminput.cpp:20: warning: possible problem detected in invocation of delete operator:
..\Ass1Q2\filminput.cpp:20: warning: invalid use of incomplete type 'struct Ui::FilmInput'
..\Ass1Q2\/filminput.h:12: warning: forward declaration of 'struct Ui::FilmInput'
..\Ass1Q2\filminput.cpp:20: note: neither the destructor nor the class-specific operator delete will be called, even if they are declared when the class is defined.
..\Ass1Q2\filminput.cpp: In member function 'void FilmInput::setUpGui()':
..\Ass1Q2\filminput.cpp:50: error: invalid use of incomplete type 'struct Ui::FilmInput'
..\Ass1Q2\/filminput.h:12: error: forward declaration of 'struct Ui::FilmInput'
mingw32-make[1]: Leaving directory `C:/Unisa/COS3711/assignments/Ass1Q2-build-desktop'
mingw32-make: Leaving directory `C:/Unisa/COS3711/assignments/Ass1Q2-build-desktop'
mingw32-make[1]: *** [debug/filminput.o] Error 1
mingw32-make: *** [debug] Error 2
The process "C:/Qt/2010.04/mingw/bin/mingw32-make.exe" exited with code %2.
Error while building project Ass1Q2 (target: Desktop)
When executing build step 'Make'

Answer 1

You copied the code, but not pro file. So, you may miss to add UI file to profile, to invoc UI compiler to generate "ui_FileInput.h" source. Please copy UI file and update .pro file with FORMS += FileInput.ui may solve your problem. To know better you can comment "ui_FileInput.h" and see the behaviour.