disable ALT+CTRL+DEL!!!!

Hi All
i need a help. I wrote an application to lock the keyboard and mouse input. Its working fine, but ALT+CTRL+DEL key is working i need to disable this also. can any body help me. Below i've posted the code.

Code:

---

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::lock()
{
    QApplication::setOverrideCursor();
    QWidget::grabMouse();
    QWidget::grabKeyboard();
 
}

---

NB: i'm calling lock() inside main() function. Plz help me.

ctrl-alt-del on windows is the "Secure attention sequence", so you can't filter it (Well, you could write a keyboard hook driver), but you can use a Windows API to disable it easily using SystemParametersInfo() :

Code:

---

SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &bOldState, 0);

---

Quote:

---

Originally Posted by fatjuicymole

ctrl-alt-del on windows is the "Secure attention sequence", so you can't filter it (Well, you could write a keyboard hook driver), but you can use a Windows API to disable it easily using SystemParametersInfo() :

Code:

---

SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &bOldState, 0);

---

---

Thank you very much. But i need Qt methods. can u plz tell me how to do it? I'm writing this application in linux enviroment.

Qt doesn't support such a feature. Maybe because it's Windows specific?

I'm not sure but maybe you could install a filter on QEvent::keypress event

You can't filter CTRL+ALT+DEL, as it's the sequence to ensure you are using an anthentic login prompt, rather than what could be a trojan prompt.

Quote:

---

Originally Posted by Corinzio

I'm not sure but maybe you could install a filter on QEvent::keypress event

---

Thank you very much for reply.
I tried like this.

Code:

---

QEvent ev(QEvent::WindowBlocked);
    ev.setAccepted(true);

---

But it is not working. Any other suggestion??

You need to call the underlying WinAPI. If you need special things of an operating system you have to use the underlying OS API (Windows => WinAPI, Linux ..., Mac OS ...)

As fatjuicymole has already been written, use:

Code:

---

#if defined(Q_WS_WIN)
        SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &bOldState, 0);
#endif

---

Best Regards
NoRulez

Quote:

---

Originally Posted by NoRulez

You need to call the underlying WinAPI. If you need special things of an operating system you have to use the underlying OS API (Windows => WinAPI, Linux ..., Mac OS ...)

As fatjuicymole has already been written, use:

Code:

---

#if defined(Q_WS_WIN)
        SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &bOldState, 0);
#endif

---

Best Regards
NoRulez

---

Thank u very much. But i'm writing this application for linux o/s. any thing in linux to disable alt+ctrl+del key press event?:(

On linux you have to edit the file "/etc/inittab" and change from

Code:

---

ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

---

to

Code:

---

# ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

---

After this you either boot the system or type on the console:

Code:

---

init q

---

This could also be done with QFile, QRegExp and QProcess

Best Regards
NoRulez

Quote:

---

Originally Posted by NoRulez

On linux you have to edit the file "/etc/inittab" and change from

Code:

---

ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

---

to

Code:

---

# ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

---

After this you either boot the system or type on the console:

Code:

---

init q

---

This could also be done with QFile, QRegExp and QProcess

Best Regards
NoRulez

---

Thank u NoRulez. I'll try in this way.