Having problem with Notepad app?

saobien39

Notepad app, sounds fantastic but it's so simple, I only have 3 files, I compile and getting some errors, somebody help me.

notepad.h

@
#ifndef NOTEPAD_H
#define NOTEPAD_H

#include <QtGui>

class Notepad : public QMainWindow
{
Q_OBJECT

public:
Notepad();

private slots:
void open();
void save();
void quit();

private:
QTextEdit *textEdit;
QAction *openAction;
QAction *saveAction;
QAction *exitAction;
QMenu *fileMenu;
};

#endif
@

notepad.cpp

@
#include "notepad.h"

Notepad::Notepad()
{
openAction = new QAction(tr("&Open"), this);
saveAction = new QAction(tr("&Save"), this);
exitAction = new QAction(tr("E&xit"), this);

connect(openAction, SIGNAL(triggered()), this, SLOT(open()));
connect(saveAction, SIGNAL(triggered()), this, SLOT(save()));
connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(openAction);
fileMenu->addAction(saveAction);
fileMenu->addSeparator();
fileMenu->addAction(exitAction);

textEdit = new QTextEdit;
setCentralWidget(textEdit);

setWindowTitle(tr("Notepad"));

}
@

main.cpp

@
#include <QtGui/QApplication>
#include "notepad.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Notepad *note = new Notepad;
note->show();
return a.exec();
}
@

Its error:

!http://nn0.upanh.com/b5.s1.d4/eea0527fdf7b5b61c575404df5e51e17_46009170.h1.png(error)!

Sam

You have declared the three slots in notepad.h. You need to write the definition of the same in your implementation file i.e notepad.cpp
@
void Notepad::open()
{
//do something
}

void Notepad::save()
{
//do something
}

void Notepad::quit()
{
//do something
}@

saobien39

oh, I will review it, thanks :)

ps:

@
connect(saveAction, SIGNAL(triggered()), this, SLOT(save()));
connect(exitAction, SIGNAL(triggered()), qApp , SLOT(quit()));
@

I don't know how difference between this and qApp ...

goetz

this is a pointer to the object you are in - in this case it's the Notepad object. aApp is a convenience macro that returns a pointer to the QApplication object.

The recent docs with the "Getting started with Qt tutorial":/doc/qt-4.8/gettingstartedqt.html have some additions regarding the missing methods.