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