How to display widget in calling method, called from main

[jpn]

Maybe it's just the problem with the example, but main() in the first post is not calling newWindow()?

Here are a couple of examples. Two windows appear with self-explanatory titles:

// main.cpp
#include <QApplication>
#include <QMainWindow>
 
void newWindow()
{
    QMainWindow* window = new QMainWindow;
    window->setWindowTitle("Created in newWindow()");
    window->setAttribute(Qt::WA_DeleteOnClose);
    window->show();
}
 
QMainWindow* createWindow()
{
	QMainWindow* window = new QMainWindow;
	window->setWindowTitle("Created in createWindow()");
	window->setAttribute(Qt::WA_DeleteOnClose);
	return window;
}
 
int main(int argc, char* argv[])
{
	QApplication a(argc, argv);
	newWindow();
	QMainWindow* window = createWindow();
	window->show();
	return a.exec();
}

// main.cpp
#include <QApplication>
#include <QMainWindow>

void newWindow()
{
    QMainWindow* window = new QMainWindow;
    window->setWindowTitle("Created in newWindow()");
    window->setAttribute(Qt::WA_DeleteOnClose);
    window->show();
}

QMainWindow* createWindow()
{
	QMainWindow* window = new QMainWindow;
	window->setWindowTitle("Created in createWindow()");
	window->setAttribute(Qt::WA_DeleteOnClose);
	return window;
}

int main(int argc, char* argv[])
{
	QApplication a(argc, argv);
	newWindow();
	QMainWindow* window = createWindow();
	window->show();
	return a.exec();
}

To copy to clipboard, switch view to plain text mode 

[kaydknight]

Opps! Silly me, I did not include newWindow in the first post.

Emmm, anyway, as per previous situation, I did call method newWindow from main, Just that it was still destroyed after returning to main.

But you know what's weird? I tried running your original solution again, and this time it worked!!! I don't know why. I suspect it must have something to do with not cleaning my previous built project solution (I use vc2005 express) and kept some of the old settings, or something else maybe

Well, the example you showed now works! I'm also able to add other widgets into the main widget. Thank you very much!