DialogBox.show() issue in MainWindow [SOLVED]

[vezprog]

Right now before I fully start designing my application, I would like to make sure I am able to open a new form from my main for, and pass variables between the two. As a start, I figured I would try to at least make a widget (button) that I can click and a new form will appear.

I have a couple questions before my I post my code (very basic). If I execute a QDialog but, will my main window functions still run in the background? 2nd, can I still use a .ui file for the designer and create my dialog box that way instead of hard coding dimensions and what not?

Now on that now, here is the code I am trying to implement.

dialogtest.h
@

#ifndef DIALOGTEST_H
#define DIALOGTEST_H

#include <QDialog>
#include "mainwindow.h"

namespace Ui {
class dialogtest;
}

class dialogtest : public QDialog
{
Q_OBJECT

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

private:
Ui::dialogtest *ui;
};

#endif // DIALOGTEST_H
@

mainwindow.h
@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <dialogtest.h>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

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

private:
Ui::MainWindow *ui;

public slots:
void openDialog();
};

#endif // MAINWINDOW_H
@

dialogtest.cpp
@
#include "dialogtest.h"
#include "ui_dialogtest.h"
#include "mainwindow.h"

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

dialogtest::~dialogtest()
{
delete ui;
}
@

mainwindow.cpp
@
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "dialogtest.h"
#include <QDialog>

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

connect(ui->btopen, SIGNAL(clicked()), this, SLOT(openDialog()));

}

void MainWindow::openDialog()
{
dialogtest.exec();
}

MainWindow::~MainWindow()
{
delete ui;
}
@

main.cpp
@

#include <QtGui/QApplication>
#include "mainwindow.h"
#include "dialogtest.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

return a.exec();

}
@

I am very new to Qt and am trying to learn on my own through tutorials so bare with me here. This is the error that flags:
mainwindow.cpp:18: error: expected unqualified-id before ‘.’ token

I guess my issue is linking the two forms together. My overall goal is to pass variable values between the two forms, but I figured I would start here. It might just be as simple as using global variables as in C++ using extern, but I will look into that after this issue is solved.

Thank you in advance!

[Eddy]

In you opendialog slot you have to make an instance of dialogTest first. Your program is complaining it doesn't know the identifier before the .

Then use show()

[vezprog]

since I have the .ui file made, and the class for it, I thought it would be all set. Do you mean in my main function in mainwindow.cpp I have to add an initialization for it? Could you elaborate a little bit please.

Thank you again for the quick reply.

[Eddy]

Try this :

@void MainWindow::openDialog()
{
Dialogtest dia;
    dia.show();
}@

[vezprog]

For some reason .show() does not activate the window. exec() does though. Not really sure about the difference, but either way, problem solved. Thank you!

[mlong]

I don't think won't work, as Dialogtest is created on the stack and will fall out of scope as openDialog() exits, since show() doesn't block.

Edit: Or will it?

[Eddy]

Sorry, my mistake. I didn't test it first. If you use show, you should use setModal first.

"Here is the full explanation.":http://developer.qt.nokia.com/doc/qt-4.7/qdialog.html#id-8f49114e-2fb8-4525-8a9d-af84f69df7e6