How to keep System tray icons

[mkkguru]

I updated the code as follows still the error coming as QSystemTrayIcon::setVisible: No Icon set

void  foo ::createTrayIcon()
 { 
  QIcon icon;
        icon =  QIcon(QPixmap( ":/images/new.png" ) );
         tray = new QSystemTrayIcon(icon,this);
        tray->setContextMenu(cmenu);
        tray->setIcon(icon);
        tray->setVisible(true);
        setWindowIcon(icon);
        tray->show();
         connect(tray, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
             this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));
 }
 
void foo::iconActivated(QSystemTrayIcon::ActivationReason reason)
{
 
     switch (reason) {
     case QSystemTrayIcon::Trigger:
          tray->show();
     case QSystemTrayIcon::DoubleClick:
              break;
     case QSystemTrayIcon::MiddleClick:
         //  showMessage();
         break;
     default:
         ;
     }

void  foo ::createTrayIcon()
 { 
  QIcon icon;
        icon =  QIcon(QPixmap( ":/images/new.png" ) );
         tray = new QSystemTrayIcon(icon,this);
        tray->setContextMenu(cmenu);
        tray->setIcon(icon);
        tray->setVisible(true);
        setWindowIcon(icon);
        tray->show();
         connect(tray, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
             this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));
 }

void foo::iconActivated(QSystemTrayIcon::ActivationReason reason)
{

     switch (reason) {
     case QSystemTrayIcon::Trigger:
          tray->show();
     case QSystemTrayIcon::DoubleClick:
              break;
     case QSystemTrayIcon::MiddleClick:
         //  showMessage();
         break;
     default:
         ;
     }

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Plz give some idea regarding this.................thanks in advance.....

[Corinzio]

I think you should create the QIcon on the heap with new.
In your code the QIcon icon goes out of scope when the foo::createTrayIcon() functions ends...

i'm not sure....
sorry

[Lykurg]

I think you should create the QIcon on the heap with new.
In your code the QIcon icon goes out of scope when the foo::createTrayIcon() functions ends...

i'm not sure....
sorry

No better create it on the stack. It is copied to the system tray icon instance. Try that code in your main window:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
  // BEGIN HERE
    QIcon icon = QIcon("/data/misc/nuvola/32x32/apps/kcmsystem.png");
    QSystemTrayIcon *tray = new QSystemTrayIcon(icon, this);
    tray->show();
  // END HERE
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

  // BEGIN HERE
    QIcon icon = QIcon("/data/misc/nuvola/32x32/apps/kcmsystem.png");
    QSystemTrayIcon *tray = new QSystemTrayIcon(icon, this);
    tray->show();
  // END HERE
}

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and see if it works. Works fine on my machine. And make sure your resource system works fine and your png is actually found.