/* $Id: RegCleanup.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
/** @file
 * RegCleanup - Remove "InvalidDisplay" and "NewDisplay" keys on NT4,
 *              run via HKLM/.../Windows/CurrentVersion/RunOnce.
 *
 * Delete the "InvalidDisplay" key which causes the display applet to be
 * started on every boot. For some reason this key isn't removed after
 * setting the proper resolution and even not when * doing a driver reinstall.
 * Removing it doesn't seem to do any harm.  The key is inserted by windows on
 * first reboot after installing the VBox video driver using the VirtualBox
 * utility. It's not inserted when using the Display applet for installation.
 * There seems to be a subtle problem with the VirtualBox util.
 */

/*
 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation, in version 3 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses>.
 *
 * SPDX-License-Identifier: GPL-3.0-only
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#include <iprt/win/windows.h>
#include <iprt/cdefs.h> /* RT_STR_TUPLE */
#include <iprt/types.h> /* RTEXITCODE_FAILURE */


static bool IsNt4(void)
{
    OSVERSIONINFOW VerInfo = { sizeof(VerInfo), 0 };
    GetVersionExW(&VerInfo);
    return VerInfo.dwPlatformId  == VER_PLATFORM_WIN32_NT
        && VerInfo.dwMajorVersion == 4;
}


int main()
{
    if (!IsNt4())
    {
        DWORD cbIgn;
        WriteFile(GetStdHandle(STD_ERROR_HANDLE), RT_STR_TUPLE("This program only runs on NT4\r\n"), &cbIgn, NULL);
        return RTEXITCODE_FAILURE;
    }

    /* Delete the "InvalidDisplay" key which causes the display
       applet to be started on every boot. For some reason this key
       isn't removed after setting the proper resolution and even not when
       doing a driverreinstall.  */
    RegDeleteKeyW(HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Control\\GraphicsDrivers\\InvalidDisplay");
    RegDeleteKeyW(HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Control\\GraphicsDrivers\\NewDisplay");
    return RTEXITCODE_SUCCESS;
}