Windows2003-3790/windows/appcompat/shims/specific/afterdark.cpp
2020-09-30 16:53:55 +02:00

98 lines
2.1 KiB
C++

/*++
Copyright (c) 2000 Microsoft Corporation
Module Name:
AfterDark.cpp
Abstract:
This shim hooks SystemParametersInfo and when SPI_SETSCREENSAVEACTIVE is
passed in with FALSE as its argument, the shim only deletes the
SCRNSAVE.EXE value which sets the "None" screen saver option instead of
setting ScreenSaverActive to 0 as well, which completely disables
screen savers (with no recovery UI).
History:
08/07/2000 t-adams Created
--*/
#include "precomp.h"
IMPLEMENT_SHIM_BEGIN(AfterDark)
#include "ShimHookMacro.h"
APIHOOK_ENUM_BEGIN
APIHOOK_ENUM_ENTRY(SystemParametersInfoA)
APIHOOK_ENUM_END
/*++
Abstract:
This shim hooks SystemParametersInfoA and when SPI_SETSCREENSAVEACTIVE is
passed in with FALSE as its argument, the shim only deletes the
SCRNSAVE.EXE value which sets the "None" screen saver option instead of
setting ScreenSaverActive to 0 as well, which completely disables
screen savers (with no recovery UI).
History:
08/07/2000 t-adams Created
--*/
BOOL
APIHOOK(SystemParametersInfoA)(
UINT uiAction,
UINT uiParam,
PVOID pvParam,
UINT fWinIni
)
{
HKEY hKey = 0;
BOOL bRet = FALSE;
if (SPI_SETSCREENSAVEACTIVE == uiAction && FALSE == uiParam)
{
LOGN( eDbgLevelError, "[APIHook_SystemParametersInfo] Attempt to disable screen savers - correcting");
if (RegOpenKeyExW(HKEY_CURRENT_USER, L"Control Panel\\Desktop", 0, KEY_WRITE, &hKey)
== ERROR_SUCCESS)
{
RegDeleteValueW(hKey, L"SCRNSAVE.EXE");
RegCloseKey(hKey);
bRet = TRUE;
goto exit;
}
else
{
goto exit;
}
}
else
{
bRet = ORIGINAL_API(SystemParametersInfoA)(uiAction, uiParam, pvParam, fWinIni);
goto exit;
}
exit:
return bRet;
}
/*++
Register hooked functions
--*/
HOOK_BEGIN
APIHOOK_ENTRY(USER32.DLL, SystemParametersInfoA)
HOOK_END
IMPLEMENT_SHIM_END