isSystemTrayAvailable() always crashes (Segfault) on Ubuntu 10.10 Desktop

ronM71

Obviously the response should have been "true", as my icon gets there on the tray area as I requested when I comment out the crash causing "isSystemTrayAvailable()", but why does it crash?

goetz

Can you post a code snippet, how you use it?

ronM71

@int main(int argc, char *argv[])
{
Q_INIT_RESOURCE(stylesheet);

try
{

    if (!QSystemTrayIcon::isSystemTrayAvailable())   <--- CRASH HERE@

goetz

You must construct a QApplication object first:

The following snippet works, if you leave out the QApplication it crashes:

@
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
bool ok = QSystemTrayIcon::isSystemTrayAvailable();
qDebug() << ok;

return 0;

}
@

ronM71

Much thanks. The interesting thing is that it works for OSX and Windows as is, but crashes on Ubuntu. Fine line there, I'll respect the rules.

goetz

The sys tray is always available on OS X and Windows, so the the method returns a hard coded "true".

On Linux (resp. X11) this is not always true:

bq. from the docs:
The QSystemTrayIcon class can be used on the following platforms: [...] All window managers for X11 that implement the freedesktop.org system tray specification, including recent versions of KDE and GNOME

Some old fashioned window managers don't have it. Thus it must be determined at run time and for that the window system has to be set up before with QApplication.