QSystemTrayIcon thread issue

I am running into a situation where I create a QSystemTrayIcon in the constructor of the main widget. But when I try to call show on it, it outputs about a dozen "Cannot move to target thread" messages. It still displays and is usable, but it is disconcerting to get any error messages. Here is the code:

Code:

---

IngestorGUI::IngestorGUI()
{
	if(QSystemTrayIcon::isSystemTrayAvailable())
	{
		m_ptr_SystemTrayIcon = new QSystemTrayIcon();
		m_TrayIcon = QIcon("dmax_icon.png");
		m_ptr_SystemTrayIconContextMenu = new QMenu(this);
		m_ptr_actShowGui = new QAction(this);
		m_ptr_actShowGui->setText("Show Interface");
		m_ptr_actShowGui->setCheckable(true);
		connect(m_ptr_actShowGui,SIGNAL(changed()),this,SLOT(slotShowInterface()));
		m_ptr_SystemTrayIconContextMenu->addAction(m_ptr_actShowGui);
		m_ptr_SystemTrayIcon->setIcon(m_TrayIcon);
		m_ptr_SystemTrayIcon->setContextMenu(m_ptr_SystemTrayIconContextMenu);
		m_ptr_SystemTrayIcon->show();
	}
}

---

On a side note; Is there any way to force explorer to update the system tray when I shut down? It never seems to update until I mouse over it. I tried to hide the icon before deleting, but it still didn't update. here is my destructor code:

Code:

---

IngestorGUI::~IngestorGUI()
{
	if(m_ptr_actShowGui != (QAction*) NULL)
	{
		delete m_ptr_actShowGui;
	}
	if(m_ptr_SystemTrayIconContextMenu != (QMenu*) NULL)
	{
		delete m_ptr_SystemTrayIconContextMenu;
	}
	if(m_ptr_SystemTrayIcon != (QSystemTrayIcon*)NULL)
	{
		m_ptr_SystemTrayIcon->hide();
		delete m_ptr_SystemTrayIcon;
	}
}

---

Are you using threads in your application?

I will be, but not yet. Right now this IngestorGUI object is created in main along with a QApplication. The QApplication is then executed. Here is the main code:

Code:

---

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    IngestorGUI window;
 
    return app.exec();
}

---

Can you create a minimal example that only creates the tray icon and calls exec() on the application object and see if the problem persists? BTW. Which version of Qt are you using?

4.3.1

I will try that and post back.

EDIT: The issue persists on the minimal example.

This might be a bug in Qt. You might check if it was reported in the task-tracker.

Doesn't seem to be. Can anyone corroborate this issue on their system?

Could you post the minimal example? System Tray Icon Example gives me no warnings at all with Qt/Win 4.3.1.

Code:

---

#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
	QSystemTrayIcon syst;
	syst.setIcon(QIcon("dmax_icon.png"));
	syst.show();
 
    return app.exec();
}

---

put the icon of your choice in place of the png