昔のAPI hook

dllmain.cpp

// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"
#include <detours.h>

DETOUR_TRAMPOLINE(DWORD WINAPI RealGT(LPTIME_ZONE_INFORMATION lpTimeZone), GetTimeZoneInformation);
DETOUR_TRAMPOLINE(void  WINAPI RealSysTime(LPSYSTEMTIME time), GetSystemTime);


DWORD WINAPI DetourGTZI(LPTIME_ZONE_INFORMATION lpTimeZone)
{
	DWORD ret = RealGT(lpTimeZone);
	lpTimeZone->Bias = -480;
	return ret;
}

void WINAPI DetourSysTime(LPSYSTEMTIME time)
{
	RealSysTime(time);
	time->wDay = 14;
	time->wDayOfWeek = 3;
	time->wYear = 2012;
	time->wMonth = 11;
}

__declspec(dllexport) BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	DetourFunctionWithTrampoline((PBYTE)RealGT, (PBYTE)DetourGTZI);
	DetourFunctionWithTrampoline((PBYTE)RealSysTime, (PBYTE)DetourSysTime);
	return true;
}