GUI closes

MrDFL

I'm new to qt my qt GUI closes after running my application

My code:

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

void createGUI(int argc, char* argv[]);
QApplication* app;
GUI* gui;

int main(int argc, char *argv[])
{
	createGUI(argc, argv);
	return app->exec();
}

void createGUI(int argc, char *argv[]) {
	QApplication a(argc, argv);
	GUI w;
	app = &a;
	gui = &w;
	w.setWindowFlags(Qt::MSWindowsFixedSizeDialogHint);
	w.show();

}

dheerendra

You are creating the a & w as local objects. They will be destroyed once the function call is over. Your app is crashing at app-exec() as app object is destroyed once the function call createGUI is complete.

SGaist

Hi and welcome to devnet,

In addition to to what @dheerendra wrote, since you are new to Qt, please follow the code examples in the documentation. In none of them you'll see such a way to setup and run a Qt application.