filterout the Alt+Ctrl+Del

[sudhansu]

Hi All
In my application, One system is is connect to another system (Client server type application.) I can lock the client the client from master side. If client is locked then a widget is displayed in client side. whicjh should grab all keyboard and mouse event. current all key board event are filrterout excep ALT+CTRL+DEl. inorder to do it i did like following

void CLockWidget::keyPressEvent(QKeyEvent *i_KeyEvent)
{
    //const QKeyEvent *keyEv = static_cast<QKeyEvent *>(i_Event);
 
    if(i_KeyEvent->key() == Qt::Key_Delete)
    {
        i_KeyEvent->ignore();
    }
    else if(i_KeyEvent->key() == Qt::Key_Alt)
    {
        i_KeyEvent->ignore();
    }
    else if(i_KeyEvent->key() == Qt::Key_Control)
    {
        i_KeyEvent->ignore();
    }
}

void CLockWidget::keyPressEvent(QKeyEvent *i_KeyEvent)
{
    //const QKeyEvent *keyEv = static_cast<QKeyEvent *>(i_Event);

    if(i_KeyEvent->key() == Qt::Key_Delete)
    {
        i_KeyEvent->ignore();
    }
    else if(i_KeyEvent->key() == Qt::Key_Alt)
    {
        i_KeyEvent->ignore();
    }
    else if(i_KeyEvent->key() == Qt::Key_Control)
    {
        i_KeyEvent->ignore();
    }
}

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But its not filtering out. How to it.

[toutarrive]

What do your want to intercept the Ctrl+Alt+Del sequence for?
Ctrl+Alt+Del is designed to be handle by the system, and it doesn't sound a good idea to substitute yourself to the OS.

[toutarrive]

Anyway, you can't do it at Qt level, you've got to use Win API.

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

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

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Have look at :http://www.qtcentre.org/threads/2529...T-CTRL-DEL!!!! and http://msdn.microsoft.com/en-us/libr...8VS.85%29.aspx

[squidge]

Judging from his profile, it would seem that the OP wants it for Unix/X11, not Windows, in which case, comment out the line in /etc/inittab

[toutarrive]

Well spotted ... Should read profile more carefully.
Sorry for that.

[sudhansu]

Judging from his profile, it would seem that the OP wants it for Unix/X11, not Windows, in which case, comment out the line in /etc/inittab

Yes fatjuicymole, I need to do it in Linux (using Qt). Can you plz tell me how to do in which case, comment out the line in /etc/inittab through coding?.

[squidge]

If your app is running as a typical user (non-root), then you can't.

If it's SUID root then you can use reboot() api to modify ctrl-alt-del behavior.

Another alternative is to modify /etc/initab to check for the presence of a file or pipe before allowing the operation, and then control that file or pipe from your application.