使用位集:

//Added extra leading zero to make 32-bit.
std::bitset<32> b("00110110101011110110010010000010");

auto ull = b.to_ullong();

std::ofstream f;
f.open("test_file.dat", std::ios_base::out | std::ios_base::binary);
f.write(reinterpret_cast<char*>(&ull), sizeof(ull));
f.close();