C++判断操作系统位数

//判断当前系统是否为64位
BOOL Is64BitSystem()
{
#ifdef _WIN64
    return true;
#elif _WIN32
    HMODULE hModule = LoadLibrary(TEXT("kernel32.dll"));

    typedef UINT(WINAPI * _pGetSystemWow64DirectoryA)(LPSTR, UINT);

    _pGetSystemWow64DirectoryA funcaddr = (_pGetSystemWow64DirectoryA)GetProcAddress(hModule, "GetSystemWow64DirectoryA");
    if (funcaddr == NULL)
    {
        FreeLibrary(hModule);
        return FALSE;
    }
    else
    {
        LPSTR lpBuffer = new char[MAX_PATH];
        UINT ret = funcaddr(lpBuffer, MAX_PATH);
        FreeLibrary(hModule);
        delete[] lpBuffer;
        return ret > 0;
    }
#else
#error "我草泥马，别人都编译32位64位，就你这个孤儿非要特立独行。"
#endif
}