this->close is not working correctly

[UG SEP]

Hey,
I have a problem whereas I know this->close closes the current window
I have created a another window in qt and I have to close the another window when user press a button but what happen is that it's close the current window as well as mainwindow and I only want to close the current one.
Here is the piece of code

  if(!exist(new_player,out_dup)){
out << new_player;
file.flush();
file.close();
this->close();

'Thanks in advance

[UG SEP]

@Pl45m4, @jsulm, @Christian-Ehrlicher, @SGaist thanks a lot bro
As I ask questions here I get a large variety which makes me much mature in qt
Thanks from the bottom of my heart...

[jsulm]

@UG-SEP said in this->close is not working correctly:

this->close();

So "this" is here the "other window", not main window?

[UG SEP]

@jsulm yes currently this is here the second window and when I close it the first one also closed

[jsulm]

@UG-SEP Then you will have to provide more information/code. How does the main window create the other window? Does it do anything when other window us closed?
Also: is it possible that your app is simply crashing?

[UG SEP]

Here is the Main Window @jsulm

ui->setupUi(this);
    this->hide();
    Login log;
    log.setModal(true);
    log.exec();
    this->show();

And well I did think that the program crashed because the application output show that the program exited with code(0) means runs successfully

[jsulm]

@UG-SEP How does it behave if you do not hide the main window?

[Christian Ehrlicher]

@jsulm said in this->close is not working correctly:

How does it behave if you do not hide the main window?

The all works as expected:

https://doc.qt.io/qt-5/qguiapplication.html#quitOnLastWindowClosed-prop

[UG SEP]

@jsulm then also it closes both windows
as well as I have checked whether after this->close run does the controller comes to main window or not by checking it using qDebug()<<

[jsulm]

@Christian-Ehrlicher The main window was not closed, just hidden.

[UG SEP]

@jsulm It is closed because the Application Output give the output:

13:41:39: E:\Qt in c++\Projects in Qt\build-BlackJack-Desktop_Qt_6_0_4_MinGW_64_bit-Debug\debug\BlackJack.exe exited with code 0

[SGaist]

Hi,

If you only have one top level widget visible and close it, then the application will stop. As @Christian-Ehrlicher already pointed out, it's the normal behaviour.

[jsulm]

@UG-SEP Yes, see the link @Christian-Ehrlicher posted, especially this part: "If this property is true, the applications quits when the last visible primary window". So, is this property set to true?

[Christian Ehrlicher]

@jsulm said in this->close is not working correctly:

So, is this property set to true?

Yes since it was not set to false :)

[jsulm]

@Christian-Ehrlicher said in this->close is not working correctly:

Yes since it was not set to false :)

How do you know? :-)

[Christian Ehrlicher]

@jsulm said in this->close is not working correctly:

How do you know? :-)

Since the default is true and I'm pretty sure it's not modified here.

[UG SEP]

@jsulm, @Christian-Ehrlicher, @SGaist

 ui->setupUi(this);
    QGuiApplication::setQuitOnLastWindowClosed(false);
    Login log;
    log.setModal(true);
    log.exec();

I set it false but then also it the behaviour didn't changed

[Pl45m4]

@UG-SEP

Are your this window and the other window in a parent / child relation? If you close the parent, the child window may also get closed together with it.

[Christian Ehrlicher]

As it seems this second dialog is opened in the ctor of the first... strange idea. How should this work at all?
Move it out of the ctor, check the return value and oen (or not) the mainwindow afterwards.

[UG SEP]

@Christian-Ehrlicher ok as I will do it right now but can you tell me that how can I convert the base main window.CPP as child and Second Window as parent

[Pl45m4]

@UG-SEP

You dont need to "convert" anything. QMainWindow is just a regular QWidget, extended with QToolBars and other stuff.
So you can pass a parent QWidget to the c'tor.

For example you could create both widgets in your main.cpp, pass the parent with the MainWindow c'tor and show the Login form.

• https://doc.qt.io/qt-5/qmainwindow.html#QMainWindow

Edit:
I'm assuming you what to do something like this, since your 2nd widget is called Login.:

• https://stackoverflow.com/questions/24520430/qt-login-dialog-box-before-main-window

There are so many examples out there...
(If you do it like this, they both can be independent widgets. Then you dont even need a parent / child relation. It's all about a good design / structure.)