HOWTO: Disable Task Switching on Win32 Platforms

ID: Q226359

The information in this article applies to:

Microsoft Win32 Application Programming Interface (API), included with:
- Microsoft Windows versions 95, 98
- Microsoft Windows 2000
- Microsoft Windows NT versions 3.51, 4.0

SUMMARY

This article describes how to disable task switching and other system functions accessed through key combinations such as CTRL+ESC and ATL+TAB on Win32 Platforms.

Windows 95 and Windows 98

Applications can enable and disable ALT+TAB and CTRL+ESC, for example, by calling SystemParametersInfo (SPI_SETSCREENSAVERRUNNING). To disable ALT+TAB and CTRL+ESC, set the uiParam parameter to TRUE; to enable the key combinations, set the parameter to FALSE:


UINT nPreviousState;

// Disables task switching
SystemParametersInfo (SPI_SETSCREENSAVERRUNNING, TRUE, &nPreviousState, 0);

// Enables task switching
SystemParametersInfo (SPI_SETSCREENSAVERRUNNING, FALSE, &nPreviousState, 0);

NOTE: Applications that use SystemParametersInfo (SPI_SETSCREENSAVERRUNNING) to disable task switching must enable task switching before exiting or task switching remains disabled after the process terminates.

Windows NT 4.0 Service Pack 3 and Later and Windows 2000

Applications can disable ALT+TAB or CTRL+ESC by installing a low-level keyboard hook. A low-level keyboard hook (WH_KEYBOARD_LL) is installed by calling SetWindowsHookEx. For more information on Window hooks see the "Hooks" overview in the Platform SDK documentation.

The following is a sample low-level keyboard hook procedure that disables CTRL+ESC, ALT+TAB, and ALT+ESC:


LRESULT CALLBACK LowLevelKeyboardProc (INT nCode, WPARAM wParam, LPARAM lParam)
{
    // By returning a non-zero value from the hook procedure, the
    // message does not get passed to the target window
    KBDLLHOOKSTRUCT *pkbhs = (KBDLLHOOKSTRUCT *) lParam;
    BOOL bControlKeyDown = 0;

    switch (nCode)
    {
        case HC_ACTION:
        {
            // Check to see if the CTRL key is pressed
            bControlKeyDown = GetAsyncKeyState (VK_CONTROL) >> ((sizeof(SHORT) * 8) - 1);
            
            // Disable CTRL+ESC
            if (pkbhs->vkCode == VK_ESCAPE && bControlKeyDown)
                return 1;

            // Disable ALT+TAB
            if (pkbhs->vkCode == VK_TAB && pkbhs->flags & LLKHF_ALTDOWN)
                return 1;

            // Disable ALT+ESC
            if (pkbhs->vkCode == VK_ESCAPE && pkbhs->flags & LLKHF_ALTDOWN)
                return 1;

            break;
        }

        default:
            break;
    }
    return CallNextHookEx (hHook, nCode, wParam, lParam);
}

Windows NT 4.0 Service Pack 2 and Earlier, Windows NT 3.51 and Earlier

Applications can disable CTRL+ESC system-wide by replacing the Windows NT Task Manager, but this is not recommended.

Applications can disable ALT+TAB and ALT+ESC when the application is running by registering hotkeys for the ALT+TAB and ALT+ESC combinations by calling RegisterHotKey.

MORE INFORMATION

Older development tools, such as Microsoft Visual C++ Version 5.0 and earlier, might not contain the header files necessary to build an application that uses low-level keyboard hooks. To obtain the most recent header files, download the latest Platform SDK from:

http://msdn.microsoft.com/developer/sdk

Because low-level keyboard hooks are a feature specific to Windows NT 4.0 Service Pack 3 and later, define _WIN32_WINNT >= 0x0400 prior to including winuser.h (or windows.h).

Additional query words: SystemParametersInfo SetWindowsHookEx Hooks SPI_SCREENSAVERRUNNING SPI_SETSCREENSAVERRUNNING WH_KEYBOARD_LL

Keywords : kbHook kbInput kbNTOS400 kbWinOS2000 kbSDKWin32 kbGrpUser kbWinOS95 kbWinOS98
Version : winnt:3.51,4.0
Platform : winnt
Issue type : kbhowto