PopUP Window in Qt - qt

Question

I am creating an application in Qt and I have a problem. I have a main window and I want that when I push a button, a popup window appears. I dont know how can I do it. I tried to call the show() method when I push the button but dont work. I think that I must use the exec() method from QApplication but I dont know how can call it if I created it in the main class.
My classes:
#include "mainwindow.h"
#include "dialog.h"
#include <QApplication>
#include "popup1.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
MainWindow:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <iostream>
#include <QApplication>
int posiciones[10];
std::string port="";
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
for (int i=1; i<10; i++){
if(i==7){
posiciones[i]=90;
}
posiciones[i]=0;
}
//Mandar el vector para mover
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
PopUp:
#include "popup1.h"
#include "ui_popup1.h"
Popup1::Popup1(QWidget *parent) :
QDialog(parent),
ui(new Ui::Popup1)
{
ui->setupUi(this);
}
Popup1::~Popup1()
{
delete ui;
}
Anyone knows how can I show the popup window? Thanks for your time.

Answer 1

Connect your button signal clicked() with exec() slot of your popup window:
connect(pushButton, SIGNAL(clicked()), popupWindow, SLOT(exec()));
Where pushButton - pointer to your button, and popupWindow - pointer to your popup window. You can write this code in QMainWindow constructor.

Answer 2

Include your pop-up class in your MainWindow.h:
include "popup.h"
Define a pointer to your pop-up class in the MainWindow.h:
popup1 *mpPopUp1;
Create an object in the MainWindow.cpp file:
mpPopUp1 = new popup1;
Define a slot in MainWindow.h and call it, for example, showPopUp():
void showPopUp();
Create the slot showPopUp() in your MainWindow.cpp and write the following statement inside it:
mpPopUp1 ->show();
Connect your pushButton to the slot showPopUp():
connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(showPopUp()));
Run you app, click on pushButton and voila