disable ALT+CTRL+DEL!!!!

[phillip_Qt]

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.

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();
 
}

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();
 
}

To copy to clipboard, switch view to plain text mode 

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

[squidge]

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() :

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

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

To copy to clipboard, switch view to plain text mode 

[phillip_Qt]

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() :

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

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

To copy to clipboard, switch view to plain text mode 

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.

[squidge]

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

[Corinzio]

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

[squidge]

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.

[phillip_Qt]

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.

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

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

To copy to clipboard, switch view to plain text mode 

But it is not working. Any other suggestion??

[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:

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

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

To copy to clipboard, switch view to plain text mode 

Best Regards
NoRulez

[phillip_Qt]

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:

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

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

To copy to clipboard, switch view to plain text mode 

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?

[NoRulez]

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

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

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

To copy to clipboard, switch view to plain text mode 

to

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

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

To copy to clipboard, switch view to plain text mode 

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

init q

init q

To copy to clipboard, switch view to plain text mode 

This could also be done with QFile, QRegExp and QProcess

Best Regards
NoRulez

[phillip_Qt]

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

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

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

To copy to clipboard, switch view to plain text mode 

to

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

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

To copy to clipboard, switch view to plain text mode 

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

init q

init q

To copy to clipboard, switch view to plain text mode 

This could also be done with QFile, QRegExp and QProcess

Best Regards
NoRulez

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