PyQt application crashes after closing QMessagebox window
Here is the code of my simple tray application. It crashes with segfault when i call information window from context menu of application and then close it. I've tryed different variants to find a reason of segfault, this is my last try.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
from PyQt4 import QtCore
from PyQt4 import QtGui
class SystemTrayIcon(QtGui.QSystemTrayIcon):
def __init__(self, parent=None):
QtGui.QSystemTrayIcon.__init__(self, parent)
self.setIcon(QtGui.QIcon("icon.png"))
self.iconMenu = QtGui.QMenu(parent)
appabout = self.iconMenu.addAction("About")
appexit = self.iconMenu.addAction("Exit")
self.setContextMenu(self.iconMenu)
self.aboutdialog = QtGui.QWidget(parent开发者_高级运维)
self.connect(appabout,QtCore.SIGNAL('triggered()'),self.showAbout)
self.connect(appexit,QtCore.SIGNAL('triggered()'),self.appExit)
self.show()
def showAbout(self):
QtGui.QMessageBox.information(self.aboutdialog, self.tr("About Tunarium"), self.tr("Your text here."))
def appExit(self):
sys.exit()
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
trayIcon = SystemTrayIcon()
trayIcon.show()
sys.exit(app.exec_())
I don't know Python but in your appExit()
, you should be calling quit()
or exit()
on the application object which will cause your call to sys.exit(app.exec_())
in main to return. Again, not knowing the Python specifics, you can do this by using the Qt macro qApp
and call qApp->quit()
or QCoreApplication::instance()->quit()
.
Calling quit()
is the same as calling exit(0)
. You can use exit()
directly to return any exit code of your choice.
Update: I've tried your code in C++ with a few tweaks and it does work. I've commented where you should try making changes to your code. Hope it works for you.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
from PyQt4 import QtCore
from PyQt4 import QtGui
class SystemTrayIcon(QtGui.QSystemTrayIcon):
def __init__(self, parent=None):
QtGui.QSystemTrayIcon.__init__(self, parent)
self.setIcon(QtGui.QIcon("icon.png"))
self.iconMenu = QtGui.QMenu(parent)
appabout = self.iconMenu.addAction("About")
appexit = self.iconMenu.addAction("Exit")
self.setContextMenu(self.iconMenu)
# Remove this next line, it isn't needed
#self.aboutdialog = QtGui.QWidget(parent)
self.connect(appabout,QtCore.SIGNAL('triggered()'),self.showAbout)
self.connect(appexit,QtCore.SIGNAL('triggered()'),self.appExit)
# Remove this next line, it isn't needed
#self.show()
def showAbout(self):
# Before showing the message box, disable the tray icon menu
self.iconMenu.setEnabled(false)
# Replace self.aboutdialog with the Python equivalent of null (0?)
QtGui.QMessageBox.information(0, self.tr("About Tunarium"), self.tr("Your text here."))
# Re-enable the tray icon menu
self.iconMenu.setEnabled(true)
def appExit(self):
# Replace the next line with something that calls the QApplication's
# exit() or quit() function.
#sys.exit()
app.quit()
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
# Tell the application not to exit when the last window is closed. This should
# prevent the application from exiting when the message box is closed.
app.setQuitOnLastWindowClosed(false)
trayIcon = SystemTrayIcon()
trayIcon.show()
sys.exit(app.exec_())
Update 2:
As requested, here is the equivalent C++ code:
main.cpp
#include <QtGui/QApplication>
#include "SystemTrayIcon.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
app.setQuitOnLastWindowClosed(false);
SystemTrayIcon trayIcon(&app);
trayIcon.show();
return app.exec();
}
SystemTrayIcon.h
#ifndef SYSTEMTRAYICON_H
#define SYSTEMTRAYICON_H
#include <QtGui/QSystemTrayIcon>
#include <QtGui/QAction>
#include <QtGui/QMenu>
#include <QtGui/QWidget>
class SystemTrayIcon : public QSystemTrayIcon
{
Q_OBJECT
public:
SystemTrayIcon(QObject * parent = 0);
virtual ~SystemTrayIcon();
private:
QAction * m_appabout;
QAction * m_appexit;
QMenu * m_iconMenu;
QWidget * m_aboutdialog;
private slots:
void slot_showAbout();
void slot_exit();
};
#endif /* SYSTEMTRAYICON_H */
SystemTrayIcon.cpp
#include <iostream>
#include <QtCore/QCoreApplication>
#include <QtGui/QIcon>
#include <QtGui/QAction>
#include <QtGui/QMessageBox>
#include "SystemTrayIcon.h"
SystemTrayIcon::SystemTrayIcon(QObject * parent) :
QSystemTrayIcon(parent),
m_appabout(0),
m_appexit(0),
m_iconMenu(0),
m_aboutdialog(0)
{
setIcon(QIcon("icon.png"));
m_iconMenu = new QMenu();
m_appabout = m_iconMenu->addAction("About");
m_appexit = m_iconMenu->addAction("Exit");
setContextMenu(m_iconMenu);
connect(m_appabout, SIGNAL(triggered()), this, SLOT(slot_showAbout()));
connect(m_appexit, SIGNAL(triggered()), this, SLOT(slot_exit()));
}
SystemTrayIcon::~SystemTrayIcon()
{
}
void SystemTrayIcon::slot_showAbout()
{
std::cout << "slot show about." << std::endl;
m_iconMenu->setEnabled(false);
QMessageBox::information(0, "About Tunarium", "Your text here.");
m_iconMenu->setEnabled(true);
}
void SystemTrayIcon::slot_exit()
{
std::cout << "slot exit." << std::endl;
qApp->quit();
}
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