Open back a closed frame?

Escenario:

1. Main window opens
2. I click a pushbutton to go the help window
3. Help window opens, main window closes


That's fine... but when I add a pushbutton to the help window to go the main window again, I get a compilation error... I use the exact same code I use to open a new frame... but I don't know what is happening... apparently it has something to do with the fact that the main window is already declared or something...

We don't know what is happening either. You have the advantage of having actually seen the error.

Well... lets say I have:

mainwindow.h
mainwindow.cpp
aboutwindow.h
aboutwindow.cpp

In order for mainwindow to open aboutwindow using a pushbutton I have to do this:

In mainwindow.h, I do the following modifications.

#include aboutwindow.h //Include the header of the window I wanna open

on public slots:

void openAboutWindow(); //Declare a function to open the window

on private:
AboutWindow * windowAbout; //I declare a var for the window

on private slots:
void on_buttonabout_clicked(); //Thats the function to call when I click on the push button

And then on mainwindow.cpp I add the following code:


void MainWindow :: on_buttonabout_clicked() //This is executed once I click the button
{
openAboutWindow();

}

void MainWindow :: openAboutWindow() //This is called by the previous function
{n
close(); //This closes the current window
windowAbout = new AboutWindow(this);
windowAbout->show(); //This shows the "about" window
}



----


That works perfectly to call a new window that I haven't opened before.... But once I do that, let's say I want to go back to the main window... so in the aboutwindow.ui I add a new push button, and I do the exact same code, except this time goes from aboutwindow to mainwindow... but it doesn't work... gives me a compilation error:

"ISO C++ forbids the declaration of MainWindow with no type", that is the on private line I added...

You probably end up with:

file1.h: #include "file2.h"
file2.h: #include "file1.h"

You have to sort out the circular dependency. Forward declarations and refactoring are common solutions to the problem.

:D and how could I do that? I'm just starting with QT and C++... just an idea could be useful, thanks in advance.

I have already given you two ideas. Type them into your favourite web search engine and see what pops out.