Function forEachSubKey

src/env.cpp:841–880

}

bool forEachSubKey(HKEY key, std::function<bool(const wchar_t* name)> f)
{
  auto name      = std::make_unique<wchar_t[]>(1000 + 1);
  DWORD nameSize = 1000;

  DWORD i = 0;

  // something would be really wrong if it had more than 100 keys
  while (i < 100) {
    auto r = ::RegEnumKeyExW(key, i, name.get(), &nameSize, nullptr, nullptr, nullptr,
                             nullptr);

    if (r == ERROR_NO_MORE_ITEMS) {
      // no more subkeys
      break;
    }

    if (r == ERROR_SUCCESS) {
      // a subkey exists
      auto subkey = openRegistryKey(key, name.get());

      if (!subkey) {
        // can't open it, stop
        return false;
      }

      // fire callback
      if (!f(name.get())) {
        return false;
      }
    } else {
      // something went wrong, stop
      return false;
    }

    ++i;
  }

  return true;
}

bool isKeyEmpty(HKEY key)
{