collect2: ld returned 1 exit status -- working with toolbars

so i'm trying to implement some menus into my programs -- i have to be doing it the hard way. Here's my code in its entirety ... please, someone tell me there's an easier way!

Code:

---

#ifndef JAUS_H
#define JAUS_H
 
#include <QMainWindow>
#include <QVBoxLayout>
 
namespace Ui {
    class jaus;
}
 
class jaus : public QMainWindow {
    Q_OBJECT
public:
    jaus();
    ~jaus();
 
protected:
    void changeEvent(QEvent *e);
    void contextMenuEvent(QContextMenuEvent *event);
 
private:
    Ui::jaus *ui;
 
    void createActions();
    void createMenus();
 
    QMenu *fileMenu;
    QMenu *dataMenu;
    QMenu *helpMenu;
    QAction *exitAct;
    QAction *startLogAct;
    QAction *stopLogAct;
    QAction *debugAct;
    QAction *aboutAct;
 
private slots:
    void exit();
    void startLog();
    void stopLog();
    void debug();
    void about();
 
};
 
#endif // JAUS_H
 
 
 
#include "jaus.h"
#include "ui_jaus.h"
 
jaus::jaus()
{
    QWidget *widget = new QWidget;
    setCentralWidget(widget);
 
    QWidget *topFiller = new QWidget;
    topFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 
    QWidget *bottomFiller = new QWidget;
    bottomFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 
    QVBoxLayout *layout = new QVBoxLayout;
    layout->setMargin(5);
    layout->addWidget(topFiller);
    layout->addWidget(bottomFiller);
    widget->setLayout(layout);
 
    createActions();
    createMenus();
 
    QString message = tr("JAUS Communicator - Version 0.1");
    statusBar()->showMessage(message);
}
 
 
jaus::~jaus()
{
    delete ui;
}
 
void jaus::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}
 
void jaus::createActions()
{
    exitAct = new QAction(tr("&Exit"), this);
    exitAct->setStatusTip(tr("Exit the application"));
    connect(exitAct, SIGNAL(triggered()), this, SLOT(exit()));
 
    startLogAct = new QAction(tr("&Logging"), this);
    startLogAct->setStatusTip(tr("Enables Logging"));
    connect(startLogAct, SIGNAL(triggered()), this, SLOT(startLog()));
 
    debugAct = new QAction(tr("&Debug"), this);
    debugAct->setStatusTip(tr("Turns Debugging On"));
    connect(debugAct, SIGNAL(triggered()), this, SLOT(debug()));
 
    aboutAct = new QAction(tr("&About"), this);;
    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
}
 
void jaus::createMenus()
{
    fileMenu = menuBar()->addMenu(tr("&File"));
    fileMenu->addAction(exitAct);
    fileMenu->addSeparator();
 
    dataMenu = menuBar()->addMenu(tr("&Data"));
    dataMenu->addAction(startLogAct);
    dataMenu->addAction(debugAct);
    dataMenu->addSeparator();
 
    helpMenu = menuBar()->addMenu(tr("&Help"));
    helpMenu->addAction(aboutAct);
}
 
void jaus::about()
{
 
}
 
void jaus::exit()
{
 
}
 
void jaus::debug()
{
 
}
 
 
void jaus::startLog()
{
 
}
 
void jaus::stopLog()
{
 
}
 
 
 
#include <QtGui/QApplication>
#include "jaus.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    jaus w;
    w.show();
    return a.exec();
}

---

When I compile this code I get the collect2: ld returned 1 exit status error message. I have no clue what this means, but hopefully I can find an easier way (maybe a drag/drop option??) to add menus to my programs. Thanks for any help!!

I don't see where you allocates memory for ui, but you are trying to call some ui methods in jaus::changeEvent. it must lead to crash.

You can create your menu in designer.

That would be great - can you tell me how? I couldn't find it anywhere

http://qt.nokia.com/doc/4.0/designer-manual.html