Class declaration error

aurora

I'm writting a code, where i'm using designer to design the form and i also needed to update that form dynamically....
when i not used designer to design the form, my code was like this...

mainwindow.h

@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>
 
class QVBoxLayout;
 
class MainWindow : public QMainWindow
{
Q_OBJECT
 
public slots:
void addRow( void );
 
public:
MainWindow(QWidget *parent = 0);
~MainWindow();
 
private:
QVBoxLayout* m_layout;
};
 
#endif // MAINWINDOW_H@

mainwindow.cpp
@
#include "mainwindow.h"

#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPushButton>
#include <QLineEdit>
 
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent),
m_layout( new QVBoxLayout() )
{
QPushButton* add = new QPushButton("Add");
connect(add, SIGNAL(clicked()), this, SLOT(addRow()));
 
m_layout->addWidget(add);
m_layout->setAlignment(Qt::AlignTop);
 
QWidget* w = new QWidget();
w->setLayout(m_layout);
 
this->setCentralWidget(w);
}
 
MainWindow::~MainWindow()
{
 
}
 
void MainWindow::addRow( void )
{
QLineEdit* line = new QLineEdit();
QPushButton* clear = new QPushButton("Clear");
QPushButton* remove = new QPushButton("Remove");
 
QHBoxLayout* layout = new QHBoxLayout();
layout->setMargin(0);
layout->addWidget(line);
layout->addWidget(clear);
layout->addWidget(remove);
 
QWidget* w = new QWidget();
w->setLayout(layout);
 
connect(clear, SIGNAL(clicked()), line, SLOT(clear()));
connect(remove, SIGNAL(clicked()), w, SLOT(deleteLater()));
 
m_layout->addWidget(w);
}@

but inorder to include my form which is designed using Qt designer...i changed it as follows..
MainWindow::MainWindow(QWidget parent)
@ : QMainWindow(parent),
ui(new Ui::MainWindow),
m_layout( new QVBoxLayout() )
{
ui->setupUi(this);
QPushButton add = new QPushButton("Add");
connect(add, SIGNAL(clicked()), this, SLOT(addRow()));

m_layout->addWidget(add);
.............
.............@

But here i'm getting error saying..
error: class 'MainWindow' does not have any field named 'ui'
error: invalid use of incomplete type 'struct Ui::MainWindow'
error: forward declaration of 'struct Ui::MainWindow'
error: 'ui' was not declared in this scope

please help me wher i'm going wrong..!!!?

Moderator note: please don't shout. Using all caps and three exclamation marks is considered shouting, and thus rude. Also, the Qt Quick forum is not for quick answers, but about the QML/Quick technology, so I moved your topic. Andre

rokemoon

Here is the default defenition of MainWindow with form.
Header:
@

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H
@
Source:
@

#include "mainwindow.h"
#include "ui_mainwindow.h"

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

MainWindow::~MainWindow()
{
delete ui;
}
@
So look what you miss and try to correct.

aurora

i did,,,,but i'm getting error saying that
error: invalid use of incomplete type 'struct Ui::MainWindow'

at line... " ui(new Ui::MainWindow)" in the code
@MainWindow::MainWindow(QWidget parent)
: QMainWindow(parent),
ui(new Ui::MainWindow),
m_layout( new QVBoxLayout() )
{
ui->setupUi(this);
QPushButton add = new QPushButton("Add");
connect(add, SIGNAL(clicked()), this, SLOT(addRow()));@

please let me know whats wrong?

rokemoon

Have you add this @#include "ui_mainwindow.h"@ ?

andre

Having an "undefined <something>" error almost always is the result of one of these errors:

A typo in the type name
A forgotten #include

There are some other possibilities, but I won't bore you with those.