How do I use a mainwindow .ui file?

[thomaspu]

Help, I'm lost. I created a main window in the designer and saved it and now I'm trying to use it.

main.cpp

#include <QApplication>
#include "MainWindow.h"
 
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
 
	MainWindow *mainW = new MainWindow();
	mainW->show();
 
	return app.exec();
}

#include <QApplication>
#include "MainWindow.h"

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);

	MainWindow *mainW = new MainWindow();
	mainW->show();

	return app.exec();
}

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MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QDialog>
#include <ui_MainWindow.h>
 
class MainWindow : public QDialog, public Ui::MainWindow
{
	Q_OBJECT
 
	public:
		MainWindow(QWidget *parent = 0);
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QDialog>
#include <ui_MainWindow.h>

class MainWindow : public QDialog, public Ui::MainWindow
{
	Q_OBJECT

	public:
		MainWindow(QWidget *parent = 0);
}

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MainWindow.cpp

#include "MainWindow.h"
 
MainWindow::MainWindow(QWidget *parent )
	: QDialog(parent)
{
	setupUi(this);
}

#include "MainWindow.h"

MainWindow::MainWindow(QWidget *parent )
	: QDialog(parent)
{
	setupUi(this);
}

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The error that I get is:
MainWindow.cpp: In constructor 'MainWindow::MainWindow(QWidget*)':
MainWindow.cpp:26: error: no matching function for call to 'MainWindow::setupUi(MainWindow* const)'
Ui/ui_MainWindow.h:52: note: candidates are: void Ui_MainWindow::setupUi(QMainWindow*)

So I know my problem is the "setupUi(this);" What the hell does it want? I'm lost.

Thanks,
Paul