How to show two main windows?

[Althor]

Hi, I´m new here.

I´m developing a qt application and I have a main window as application's user interface. I have several dialogs too.

My problem is I have to develop a new module for the app and it must have a toolbar, stastusbar, etc. As I can´t develop this elements with a QDialog I need a QMainWindow, but when I call show() from the principal window to show the new window it is shown and closed.

How can I show a main window from another main window?

Thanks in advance.
Regards.

[fnmblot]

Couldn't you just use an mdi area and change the toolbar when the other "main window" is opened?

[Althor]

Hi fnmblot

If I use a mdi area, I only can show a window at every moment, isn't?

I need to show a main window from another but I don't want to hide or close it.

Regards.

[jpn]

Sounds like you allocate the window on the stack and therefore it goes out of scope according to normal C++ rules:

{
     QMainWindow window;
     window.show();
} // window goes out of scope

{
     QMainWindow window;
     window.show();
} // window goes out of scope

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You should allocate the window on the heap with C++ operator new.

[Althor]

Hi jpn

It´s true! The window goes out of the scope and disappears. I´ve designed it using singleton pattern and now it works fine.

I didn´t think that the problem was that. I was thinking that a window didn´t show other window.

Thanks a lot.