Endscene hooking problem

 
// globals / constants
 
const D3DCOLOR txtPink = D3DCOLOR_ARGB(255, 255, 0, 255);
 
DWORD WINAPI HookThread();
void *DetourFunc(BYTE *src, const BYTE *dst, const int len);
 
typedef HRESULT(__stdcall* EndScene_t)(LPDIRECT3DDEVICE9);
HRESULT __stdcall hkEndScene(LPDIRECT3DDEVICE9 pDevice);
void DrawRect (LPDIRECT3DDEVICE9 Device_t, int X, int Y, int L, int H, D3DCOLOR color);
bool bDataCompare(const BYTE* pData, const BYTE* bMask, const char* szMask);
DWORD dwFindPattern(DWORD dwAddress,DWORD dwLen,BYTE *bMask,char * szMask);
 
HMODULE MyModule = NULL;
EndScene_t pEndScene;
DWORD dwEndScene;
HMODULE hModule = NULL;
DWORD* VTableStart = 0;  
 

 
//DLL main
 
BOOL WINAPI DllMain(HINSTANCE hinstDll,DWORD Reason,LPVOID Reserved)
{
	switch(Reason)
	{
		case DLL_PROCESS_ATTACH:
			MyModule = hinstDll;
			CreateThread(0, 0, (LPTHREAD_START_ROUTINE)&HookThread, 0, 0, 0);
			break;
		case DLL_PROCESS_DETACH:
			MessageBox(NULL, L"Detached Hack", L"Hack Detached", 0);
			break;
	}
	return TRUE;
}

 
// Der Thread
 
DWORD WINAPI HookThread()
{
	while( !hModule )
	{
		hModule = GetModuleHandle(L"d3d9.dll");
		Sleep(100);
	}
	DWORD tempadd = dwFindPattern((DWORD)hModule, 0x128000, (PBYTE)"\xC7\x06\x00\x00\x00\x00\x89\x86\x00\x00\x00\x00\x89\x86", "xx????xx????xx");
	memcpy(&VTableStart, (void*)(tempadd+2), 4);
	dwEndScene = VTableStart[42];
	pEndScene = (EndScene_t) DetourFunc((PBYTE) dwEndScene, (PBYTE)hkEndScene, 5);
	return 0;
}

 
// functions
 
 
void *DetourFunc(BYTE *src, const BYTE *dst, const int len)
{
	BYTE *jmp = (BYTE*)malloc(len+5);
	DWORD dwback;
	VirtualProtect(src, len, PAGE_READWRITE, &dwback);
	memcpy(jmp, src, len); jmp += len;
	jmp[0] = 0xE9;
	*(DWORD*)(jmp+1) = (DWORD)(src+len - jmp) - 5;
	src[0] = 0xE9;
	*(DWORD*)(src+1) = (DWORD)(dst - src) - 5;
	VirtualProtect(src, len, dwback, &dwback);
	return (jmp-len);
}
 
HRESULT __stdcall hkEndScene(LPDIRECT3DDEVICE9 pDevice)
{
	DrawRect ( pDevice, 10, 10, 600, 400, txtPink);
	return pEndScene(pDevice);
}
 
void DrawRect (LPDIRECT3DDEVICE9 Device_t, int X, int Y, int L, int H, D3DCOLOR color)
{
	D3DRECT rect = {X, Y, X+L, Y+H};
	Device_t->Clear(1, &rect, D3DCLEAR_TARGET, color, 0, 0);
}
 
bool bDataCompare(const BYTE* pData, const BYTE* bMask, const char* szMask)
{
	for(;*szMask;++szMask,++pData,++bMask)
		if(*szMask=='x' && *pData!=*bMask )
			return false;
	return (*szMask) == NULL;
}
 
DWORD dwFindPattern(DWORD dwAddress,DWORD dwLen,BYTE *bMask,char * szMask)
{
	for(DWORD i=0; i < dwLen; i++)
		if( bDataCompare( (BYTE*)( dwAddress+i ),bMask,szMask) )
			return (DWORD)(dwAddress+i);
	return 0;
}

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