hooking vtable

/*returns pointer to pre-hook function*/
/*pVTBL: vtable of the class, dwIdx: virtual function index you want to hook, pNewFunc: address of your function*/
/*returns the pointer(aka address) of the original function*/
MH_FUNC MH_VTBLHook(MH_VTBL pVTBL, DWORD dwIdx, MH_FUNC pNewFunc)
{
    MH_FUNC pOrigFunc; DWORD dwOldProt;
    VirtualProtect((void*)&pVTBL[dwIdx], 4, PAGE_READWRITE, &dwOldProt);
    pOrigFunc = (BYTE*)pVTBL[dwIdx]; //save old function
    pVTBL[dwIdx] = (DWORD)pNewFunc; //set VTBL entry to new function
    VirtualProtect((void*)&pVTBL[dwIdx], 4, dwOldProt, NULL);
    return pOrigFunc;
}