Application running but doesn't show up!!!

[joandelason]

Hi
I finally managed to compile and link my first GUI application in Qt (which is almost a miracle ), but it doesn't show up. My application is just an OpenGl render context (like the one in the hellogl example) with the menu bar. It's quite strange because I open the task manager and the process is running.

Any idea?

THANK YOU

[Lykurg]

did you call show() or exec()? please provide some code because without it is hard to help. How does your main function look like?

[joandelason]

This is the main function. I run my app on a Mac and it works (although when closing it it crashes). But on Windows it does'n show up.

#include <QApplication>
#include <QDesktopWidget>
 
#include "SDIWindow.h"
 
int main(int argc, char *argv[])
{
 QApplication app(argc, argv);
 SdiWindow window;
 window.resize(window.sizeHint());
 
 window.showMaximized();
 return app.exec();
}

#include <QApplication>
#include <QDesktopWidget>

#include "SDIWindow.h"

int main(int argc, char *argv[])
{
 QApplication app(argc, argv);
 SdiWindow window;
 window.resize(window.sizeHint());

 window.showMaximized();
 return app.exec();
}

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The code is copy-pasted from the hellogl example with a small change done to make the render context occupy the whole window.

Here is the code of the hellogl main function.

#include <QApplication>
 #include <QDesktopWidget>
 
 #include "window.h"
 
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     Window window;
     window.resize(window.sizeHint());
     int desktopArea = QApplication::desktop()->width() *
                      QApplication::desktop()->height();
     int widgetArea = window.width() * window.height();
     if (((float)widgetArea / (float)desktopArea) < 0.75f)
         window.show();
     else
         window.showMaximized();
     return app.exec();
 }

#include <QApplication>
 #include <QDesktopWidget>

 #include "window.h"

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     Window window;
     window.resize(window.sizeHint());
     int desktopArea = QApplication::desktop()->width() *
                      QApplication::desktop()->height();
     int widgetArea = window.width() * window.height();
     if (((float)widgetArea / (float)desktopArea) < 0.75f)
         window.show();
     else
         window.showMaximized();
     return app.exec();
 }

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[Lykurg]

I can't see any error. Try to debug your application. See where it crashes on mac and use breakpoints to see where it might "hang up" on windows.

[wysota]

Could you paste the code for the window class if it is not too complicated?