Crash on quit on default project

rXpSwiss

Hello,

My application crashes on quit after the return in the main.
My first guess was an issue with memory allocation but since the project was basic QT one created from VS2015 I did not allocate anything new. There is only one delete in my main window and the delete is :

delete ui;

It crashes after the return in the main and the debugger just tells me that there is an access violation in the main thread.
I am not sure what could cause that issue, is it coming from somewhere else ?

#include "MainWindow.h"
#include <QtWidgets/QApplication>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MainWindow w;
	w.show();
	return a.exec();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
        ui->setupUi(this);
	this->setCentralWidget(ui->vwMain);
}

MainWindow::~MainWindow()
{
    delete ui;
}

dheerendra

any reason you r doing this->setCentralWidget(ui->vwMain); ? mwMain is from ui object which is initialised with ui.setupUI ?

rXpSwiss

@dheerendra
That was me thinking for one second that the main layout was maybe not a child of the window and that he didn't get deleted.
I just removed the line but it didn't change anything.

dheerendra

This kind of issue arises intermittently since some stray cases objects were tried deleting twice. inside main.cpp can you try the following ?

MainWindow *w = new MainWindow;
w->show();
   delete w;

Off course this will not show anything as w object is deleted immediately. Now do you hit the problem ?

rXpSwiss

@dheerendra I get an error as I start the program.

ASSERT: "!receiver->d_func()->postedEvents" in file kernel\qcoreapplication.cpp,
 line 1714
Press any key to continue . . .

rXpSwiss

I also tried make my ui object not a pointer.
The application still crashes on close.

mrjj

@rXpSwiss
Can you try with 100% clean default project ?
That is no
this->setCentralWidget(ui->vwMain);
or any other stuff :)

If that crashes, i would guess on DLL issues

J.Hilk

@rXpSwiss

what else is there in your application? Give us more info :)

rXpSwiss

@mrjj said in Crash on quit on default project:

@rXpSwiss
Can you try with 100% clean default project ?
That is no
this->setCentralWidget(ui->vwMain);
or any other stuff :)

If that crashes, i would guess on DLL issues

I did do that too.
So might be DLL ? Because it did work with QT Creator but not with VS2015

@J.Hilk said in Crash on quit on default project:

@rXpSwiss

what else is there in your application? Give us more info :)

Nothing, well now there is because I still had to start making it it just crashes when I close it.
But before that there was nothing that the default code and a UI file.