Launching GUI application on different X11 display

[basy]

Hi all.
I create simple application
mainwindow.h:

#include <QMainWindow>
#include <QTextBrowser>
#include "mainwindow.h"
 
class MainWindow : public QMainWindow {
  Q_OBJECT
 
public:
  MainWindow();
};

#include <QMainWindow>
#include <QTextBrowser>
#include "mainwindow.h"

class MainWindow : public QMainWindow {
  Q_OBJECT

public:
  MainWindow();
};

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mainwindow.cpp:

#include "mainwindow.h"
 
MainWindow::MainWindow() : QMainWindow(){
  setCentralWidget(new QTextBrowser());
}

#include "mainwindow.h"

MainWindow::MainWindow() : QMainWindow(){
  setCentralWidget(new QTextBrowser());
}

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main.cpp:

#include <QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[]) {
  QApplication a(argc, argv);
  MainWindow w;
  w.show();
  return a.exec();
}

#include <QApplication>
#include "mainwindow.h"

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

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Everything works, but when i ssh myself and run

./MyApp -display :0.0

./MyApp -display :0.0

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application starts for a while and then it fail:

ASSERT failure in QList<T>::operator[]: "index out of range", file /usr/include//QtCore/qlist.h, line 463
Aborted

ASSERT failure in QList<T>::operator[]: "index out of range", file /usr/include//QtCore/qlist.h, line 463
Aborted

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Any ideas how to manage starting application on defined X display ?
Thanks, regards BasY

[wysota]

I never had any problems running Qt applications over ssh. I doubt the error is caused by the fact you are using a different display.

[basy]

It looks like QT BUG, because when I use QLabel, i can run this application over ssh without fail..

MainWindow::MainWindow() : QMainWindow(){
  setCentralWidget(new QLabel("OK"));
}

MainWindow::MainWindow() : QMainWindow(){
  setCentralWidget(new QLabel("OK"));
}

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Also when i ssh myself: ssh -X me@my_ip i can run app without problems, but this is not solution because i need to run my app using cron...

Application fail when i use QTableWidget too...

Maybe i have to use QX11EmbedWidget or add some display config code in main(...) method.

Any ideas ?

[wysota]

The thing is Qt has nothing to do with display settings. It's just an address of the X Server XLib connects to, the rest is a matter of where X calls go so I'd look for trouble in configuration of your system(s) and not Qt itself.